UDC 621.921.67.02 1: 006.354 Group G25

STATE STANDARD OF THE UNION S S R

SANDING PAPER SKIN Technical specifications

Aoiabue paper Specifications

O S P 30 8600

Valid from 01/01/83

This standard applies to paper abrasive sand intended for abrasive processing of various materials without cooling or using cutting fluids based on oil, kerosene, and mineral spirits.

1. TYPES AND SIZES

1 1. Sanding paper should be made of types;

1 - aphids for machine and manual processing of non-metallic materials (wood, leather, rubber, plastic, etc.);

2 - for machine and manual processing of metals and alloys.

1 2. Sanding paper should be produced in rolls, the dimensions of which are indicated in the table. 1.

Table I

Official publication Reproduction prohibited* *

Proiolzhgipi i Li 7l. /

Note: At the customer's request, it is additionally possible to produce rolls with a length of more than 100 m

1.3. Sanding paper must be made with the following types of working layer:

C - solid;

R - relief.

1.4. The designs and dimensions of the relief working layer must correspond to those indicated in the drawing and in the table. 2.

Size s, mm

table 2

The angle of inclination of the relief should be 5°-85°.

1.5. The deviation from parallelism of the forming relief lines must be within the tolerance for the relief step.

An example of a symbol for paper abrasive type 1, with a continuous working layer C, 1000 mm wide. 50 m long, on paper grade 0-200, from normal electrocorundum grade 15A, grain size 25-N, on hide glue:

1C 1000X50 P2 15A 25-N M GOST 6456-82

2. TECHNICAL REQUIREMENTS

2.1. The abrasive paper must be manufactured in accordance with the requirements of this standard.

2.2. The abrasive paper must be made from the abrasive materials specified in table. 3.

Table 3

Note: At the customer's request, it is possible to produce grinding wheels of other grades of abrasive materials or mixtures thereof.

2 3. For the manufacture of sanding paper, paper in accordance with GOST 18277-72, GOST 10127-75 and industry normative and technical documentation for paper should be used as a basis in accordance with Table. 4.

T a b I and l a 4

(Changed edition, Amendment No. 2).

2.4, The abrasive paper must be made from sanding materials of the grain size specified in the table. 5.

Table 5

	3 rnistsp
F loEHtJt oConi i icHjje	5 K II to R 1 toyu N “iiit! 'ma yu - "11 MON
P2 Ш, P4, By P7, P8, P9. P10, PI

Note According to the law, it is allowed l g t p g eok‘ p< тчфо-вапъноп шк\рыг других тернист ос л ей или их смесей

(Changed edition, Amendment No. 3).

2.5. The abrasive material must be bonded to the base with flesh glue in accordance with GOST 3252-80 or other bonds in accordance with industry standard and technical documentation.

Note Allowed to be combined! pau ^ i in i ^ u is nni cops

2.6. The grain composition of grinding materials ■ is in accordance with GOST 3647-89.

2 7. (Deleted, Amendment No. 3).

2 7 1. On the working surface of a grinding wheel with a special working layer, the total area of wrinkles, folds, areas

kov without abrasive grains, filled with a binder, should not exceed 0? 5% roll area.

Note In accordance with consumer gel, the total area of these defects is allowed to be no more than 1% of the roll area.

2.7.2. On the working surface of the sanding paper with a relief working layer, the total area of defects (merging and non-printing) of the relief layer per 1 m2 should not exceed 5% of the area of the roll with the applied abrasive material.

(Changed edition, Amendment No. 3).

2.7.3. In a roll of sanding paper with a width of up to 1250 mm, edges with a width of more than 10 mm with defects are not allowed, and with a width of more than 1250 mm - more than 15 mm.

Note that on the working surface of silicon carbide and electrocoated paper and sandpapers of 6-"U40 grain size, spot adhesive formations or inclusions protruding above the working surface are allowed.

(Changed edition, Amendment No. 1, 2, 3).

2.8. The uneven thickness of the sanding paper should correspond to the values indicated in the table. 6.

Table b

2.9 The tensile strength of the sanding paper, depending on the type of paper, must correspond to the values specified in the table. 7.

Table 7

2.10. The coefficient of applying abrasive material to the base Df for sanding paper with a relief working layer should be 0.40-0.75.

2.11. The humidity of the sanding paper should be 3-7%.

2.12. The wear of electrocorundum and glass abrasives should correspond to the values indicated in the table. 8.

Table 8

Grain	Given 1	MNOS FOR T"WHAT
Grain

|] t i m e ch a not. Given (nchis carbide silicon gg evon i-achach ggpdr-

M! lOTocieii 0-M40 type 1 should be 1.5-7.0, type 2 - 7.0.

(Changed edition, Amendment No. 2).

2.13. The cutting ability of the sanding paper under the test conditions specified in the mandatory Appendix 2 must correspond to the values specified in table. 8a.

Table 8a

	(.11 OS O He OST!11K\])K!1, I	m pt ’f 1 m e n 1 *
3 KMchTR JOR\ N KYA O 1	k a r0p i \p " nshl ii	\| C I I 1 I I if ofl

(Changed edition, Amendment No. 2, 3).

3. ACCEPTANCE RULES

3.1. To ensure that the abrasive paper complies with the requirements of this slate, acceptance inspections and periodic tests should be carried out.

3.2. Acceptance control for compliance with the requirements of paragraphs. 1.2, 2.7.1, 2.7.2 and 2 73 must be subjected to at least 1% of rolls of abrasive paper from the batch, but not less than 3 pieces, according to 1.4; 1.5; 2.12 and 2.13 - 0.1%, but not less than 3 pcs.

3.1. 3.2. (Changed edition, Amendment No. 2).

3 2.1. The batch must consist of 1b sanding skins: g od-biSh.characteristics, prepared in one shift and simultaneously presented for acceptance according to one document.

3.3. If, during acceptance control, it is determined that the requirements of the standard do not comply with the requirements of the standard more than according to the controlled indication, then the batch is not accepted.

(Changed edition, Amendment No. 2).

33 1 If the icho regulations do not meet the requirements of the standard for one of the controlled indicators, then repeated control is carried out on a double number of rolls of skins

If there are defects in the re-sampling, the batch will not be accepted.

(Introduced additionally, Amendment No. 2).

3.4. Products (one of the sizes of pellets) that have passed the acceptance control (according to clause 3-2) must be subjected to periodic testing for compliance with the requirements of clauses 2-8 and 2-10 0.5%, but not less than 3 pieces, clauses 2-9 and 2-1 I 0.5% sanding paper, grit 40; 8, 5 and L\40, but not less than 3 pcs., item 2 9 - on all types of bases.

(Changed edition, Amendment No. 2).

3.5. Periodic testing should not be carried out (once a year.

(Changed edition, Amendment No. 3).

4. CONTROL AND TEST METHODS

4.1-4.1.2. (Excluded, Amendment No. 2).

4.2. The dimensions and external defects of the working surface are measured using a measuring metal line according to GOST 427-75 or a measuring metal roll according to GOST 7502-89.

4.2.1. The angle of inclination of the relief is measured using universal measuring instruments or a special template.

4.3. The uneven thickness of the skin is measured by micrometers

type M1\ (with a permissible error limit of ±0.01 mm) at a distance of at least 10 mm from the edge of the roll.

(Changed edition, Amendment No. 2).

4 4. Calculation of the coefficient of application of sh.shfmaterpa ia on the base Li is given in the mandatory Appendix 1.

4.5. To determine the moisture content of the sanding paper, three samples measuring 100x100 mm are selected and weighed on technical scales with a permissible error limit of ±0.01 g. The sanding paper samples are placed in a drying cabinet and dried at a temperature of (100±5)°C until the difference between two consecutive weighings will not exceed 0.02 g.

The moisture content of the sanding paper is determined by the difference in mass before and after drying and is calculated as a percentage of the original mass.

4.6. The reduced wear of the sanding paper (the ratio of the grain size of the sanding paper to its shedding) is determined on the K3IJI VNIIASH device by rubbing the sandpaper against the sandpaper for 2 minutes at a load of 29.4 N.

Two samples of sanding paper measuring 396X50 mm and 520X50 mm are tested.

Samples are weighed on technical balances with a permissible error limit of ±0.05 g.

Notes;

1. The crumbled amount of sanding paper is equal to the mass of the crumbled working layer in a given time interval under given conditions

2. With reduced wear range for M63 grit; L150 and M40 are marked with the numbers 5, respectively; 4 and 3.

(Changed edition, Amendment No. 2).

4.7. The method for determining the cutting ability of abrasive paper is given in mandatory Appendix 2.

4.8. Determination of the tensile strength of the abrasive paper is carried out according to GOST 13525.1-79 except paragraphs. 3.1 and 4.1 at ambient temperature. The maximum deviations in the dimensions of samples for ispapia should be ±1.0 mm.

(Changed edition, Amendment No. 2).

4.9. Samples for cosh role according to paragraphs. 4.1-4.8 are taken from any place on the roll that is at least 10 mm away from the end of the roll or edges. The value is indicative of pp. 4.3 and 4.5-4.8 is taken as the arithmetic mean of the three definitions.

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. On the non-working surface of a roll of sanding paper every (235×20) mm longitudinally and every

(200±20) mm in the transverse directions should be applied:

trademark of the manufacturer;

symbol (except for the type and indication of the type of working layer);

batch number.

Notes:

]. When using a mixture of abrasive materials - in the symbol, mark the brand mainly in foot about shlnfmatsrnala, when using a mixture of asrnist. c gene - mark the main grain size.

2. By agreement with the consumer, roll dimensions may not be applied

(Changed edition, Amendment No. 2, 3).

5.2. Bundle markings:

hide glue M;

combined ligament - K.

5.3. Winding the sanding paper into rolls should be smooth and dense, with the working layer facing outward, preventing the formation of wrinkles, folds and crumpled places.

The end surface must be flat, the protrusions of the edges of a roll up to 1250 mm wide should not exceed 5 mm, and over 1250 mm wide - 10 mm.

(Changed edition, Amendment No. 3).

5.4. Each roll of sanding paper must be wrapped in a double layer of paper in accordance with GOST 18277-72, GOST 2228-81 or GOST 10127-75. "

The r^lon must be sealed on the joint. Layers of packaging material must cover the ends of the roll and ensure its safety during transportation.

5.5. (Deleted, Amendment No. 3).

5.6. Each packaged roll must be labeled or stamped with the following information:

manufacturer's trademark; symbol; release date and batch number; technical control stamp;

image of the state Quality Mark according to the NTD for sanding paper, which has been assigned the state Quality Mark in accordance with the established procedure.

5.7-5.16. (Excluded, Amendment No. 3).

5.17. Other requirements for labeling and packaging, as well as transportation and storage, are in accordance with GOST 27595-88.

(Introduced additionally, Amendment No. 3).

Sec. 6. (Deleted, Amendment No. 2).

APPENDIX J

75^ .rear

CALCULATION OF THE APPLICATION COEFFICIENT OF SHL IFMATERI 4LA N\ BASIS

The coefficient of application of abrasive material to the base (/C h is the ratio of the area of the base with the applied abrasive material to its total area) for: versions 1 and 3 is calculated by the formula

/?«== - ,

where a is the relief width, mm!, t is the relief pitch, mm;

execution 2 is calculated according to the form

execution 4 is calculated by the formula

(Changed edition, Rev. L6 1).

s: 1 state 6456-32

APPENDIX 2

Oich^tslnoe

METHOD FOR DETERMINING THE CUTTING ABILITY OF GRINDING

1. Essence of the method

The method is based on a certain mass of plexiglass sanded with a sample of sanding paper during the test.

2. Eq uipment and materials

2.1. Diagram and description of the MI-2 type device - according to GOST 426-77.

2.2. Samples of abrasive paper with outer diameter (174rb3) mm and hole diameter (55±3) mm

2.3. Plates made of organic glass of the TOSN brand - in accordance with GOST 17622-72.

2.4. Linings made of rubber hardness Shore 60 - 80.

2.5. Adhesive grades BF-2 and BF-4 in accordance with GOST 12172-74 or other grades that ensure the strength of the connection of organic glass plates with a carved gasket - ■ according to regulatory and technical documentation

(Changed edition, Amendment No. 2).

3. Preparation for testing

3 1. Glue the plates onto the rubber pads

3 2. First grind new organic glass plates under test conditions until wear marks appear on the entire working surface of the tastin, clean from dust and weigh with the permissible error limit

4. Conducting the test

4.1. Set the test modes indicated in the table

(Changed edition, Amendment No. 1. 2).

4.2. Install the tested reverse gg:ef, s i pn, shdyukn, replacing the sanding paper on the disk after that"

4 3. Fix the organic glass plates in the holders in the same position as during grinding.

4 4 At the end of the test, release the plates and organic glass, clean them from dust and weigh them with a tolerance limit of 2^0.01 g.

5. Processing of test results

5 1. Cutting capacity (Q g/min) is determined by the formula

where m is the mass of ground organic glass, g;

5 - processing time, mi".

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR

DEVELOPERS

E. I. Ardashev; E. S. Viksman; V. T. Ivashinnikov; N. A. Ilyin; V. A. Kvitko; L. A. Kogan; O. F. Kotlyarov; I. F. Korchmar V. A. Morozov; E. B. Petrosyan; A. A. Dustier; S.K. Rozin V.A. Rybakov; N. V. Syreyshchikova; V. D. Tunikov; V. N. Tyrkov

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated 02.18.S2 No. 735

3. The date of the first inspection is 1992.

Inspection frequency - 5 years

4. INSTEAD GOST 6456-75

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

	P ] ts z^mie 2
GOST 427-75
GOST 2228-81
GOST 3252-80
GOST 3647-80
GOST 7502-89

GOST 12172-74	Pryozhenio 2
GOST 135(25 1-79
GOST 17622-72	Prnk z^pie 2
GOST 18277-72
GOST 27595-88

6. Validity period extended until 01/01/93 by Decree of the USSR State Standard dated 04/23/87 No. 1374

7. REISSUE (April 1990) with Amendments No. 1, 2, 3, approved in June 1984, April 1987 and July 1989 (IUS 9-84, 8-87, 11-89J

STATE STANDARD OF THE USSR UNION

Valid from 01/01/83

This standard applies to paper sandpaper intended for abrasive processing of various materials without cooling or using cutting fluids based on oil, kerosene, and white spirit.

1. TYPES AND SIZES

1.1. Sanding paper should be made of the following types:

1 - for machine and manual processing of non-metallic materials (wood, leather, rubber, plastic, etc.);

2 - for machine and manual processing of metals and alloys.

1.2. Sanding paper should be produced in rolls, the dimensions of which are indicated in the table. 1.

Table 1

Grain	Width, mm (limit deviation±3.0)	Length, m (limit deviation ±0.5)

	720; 750; 800; 850; 900; 1000
	1250; 1350; 1400

	720; 750; 800; 850; 900


	1250; 1350; 1400
	720; 750; 800; 850; 900

Note. Upon customer's request, it is possible to produce rolls longer than 100 m

1.3. Sanding paper must be made with the following types of working layer:

C - solid;

R - relief.

1.4. The designs and dimensions of the relief working layer must correspond to those indicated in the drawing and in the table. 2.

table 2

Dimensions, mm

The terrain inclination angle a should be 5° - 85°.

1.5. The deviation from parallelism of the forming relief lines must be within the tolerance for the relief step.

An example of a symbol for paper abrasive type 1, with a continuous working layer C, 1000 mm wide. 50 m long, on paper grade 0-290, from normal electrocorundum grade 15A, grain size 25-N, on hide glue:

2. TECHNICAL REQUIREMENTS

2.1. The abrasive paper must be manufactured in accordance with the requirements of this standard.

2.2. The abrasive paper must be made from the abrasive materials specified in table. 3.

Table 3

Note. At the customer's request, it is possible to produce abrasive paper from other grades of abrasive materials or mixtures thereof.

2.3. To make sanding paper, paper in accordance with GOST 18277-72, GOST 10127-75 and industry specifications and technical documentation for paper should be used as a base in accordance with Table. 4.

Table 4

Note. If the paper does not have an established symbol, it is allowed to indicate its brand in the symbol of the sanding paper.

(Changed edition, Amendment No. 2).

2.4. The sanding paper must be made from abrasive materials of the grit sizes indicated in the table. 5.

Table 5

Note. Upon customer's request, it is possible to produce sanding paper of other grain sizes or mixtures thereof.

(Changed edition, Amendment No. 3).

2.5. The abrasive material must be bonded to the base with hide glue in accordance with GOST 3252-80 or other bonds in accordance with industry normative and technical documentation.

Note. It is allowed to introduce dyes or coloring pigments into the bundle.

2.6. The grain composition of grinding materials is in accordance with GOST 3647-80.

2.7. (Deleted, Amendment No. 3).

2.7.1. On the working surface of abrasive paper with a continuous working layer, the total area of wrinkles, folds, areas without abrasive grains, filled with a binder, should not exceed 0.5% of the roll area.

Note. By agreement with the consumer, the total area of these defects is allowed to be no more than 1% of the roll area.

(Modified edition, Rev. No. 2, 3).

(Changed edition, Amendment No. 3).

2.7.3. In a roll of sanding paper with a width of up to 1250 mm, edges with a width of more than 10 mm with defects are not allowed, and with a width of more than 1250 mm - more than 15 mm.

Note. On the working surface of silicon carbide and electrocorundum abrasive paper of 6-M40 grit, dotted adhesive formations or inclusions protruding above the working surface are not allowed.

(Changed edition, Amendment No. 1, 2, 3).

2.8. The uneven thickness of the sanding paper should correspond to the values indicated in the table. 6.

Table 6

2.9. The tensile strength of the sanding paper, depending on the type of paper, should correspond to the values indicated in the table. 7.

Table 7

Paper symbol	Paper symbol
Paper symbol	Paper symbol	longitudinal	transverse	longitudinal	transverse

2.10. Coefficient of application of abrasive material to the base TO n for sanding paper with a relief working layer it should be 0.40 - 0.75.

2.11. The moisture content of the sanding paper should be 3 - 7%.

2.12. The given wear of electrocorundum and glass abrasive cloths must correspond to the values indicated in the table. 8.

Table 8

Note. The reduced wear of silicon carbide grinding paper of 0-M40 grit type 1 should be 1.5-7.0; type 2 - St. 7.0.

(Changed edition, Amendment No. 2).

2.13. The cutting ability of the sanding paper under the test conditions specified in the mandatory Appendix 2 must correspond to the values specified in table. 8a.

Table 8a

Grain	Skin cutting ability, g/min, not less
Grain	electrocorundum	silicon carbide	glass

(Changed edition, Amendment No. 2, 3).

3. ACCEPTANCE RULES

3.1. Acceptance inspection and periodic testing should be carried out to verify that the abrasive paper meets the requirements of this standard.

3.2. Acceptance control for compliance with the requirements of paragraphs. 1.2, 2.7.1, 2.7.2 and 2.7.3 must be subjected to at least 1% of rolls of sanding paper per batch, but not less than 3 pcs., according to paragraphs. 1.4; 1.5; 2.12 and 2.13 - 0.1%, but not less than 3 pcs.

3.1. 3.2. (Changed edition, Amendment No. 2).

3.2.1. The batch must consist of abrasive paper of one specification, produced in one shift and simultaneously presented for acceptance according to one document.

3.3. If during acceptance control it is determined that there is non-compliance with the requirements of the standard for more than one controlled indicator, then the batch is not accepted.

(Changed edition, Amendment No. 2).

3.3.1. If non-compliance with the requirements of the standard is established for one of the controlled indicators, then repeated control is carried out on a double number of rolls of skins.

If there are defects in the re-sampling, the batch will not be accepted.

(Introduced additionally, Amendment No. 2).

3.4. Products (one of the roll sizes) that have passed the acceptance control (according to clause 3.2) must be subjected to periodic testing for compliance with the requirements of clauses. 2.8 and 2.10 0.5%, but not less than 3 pcs., pp. 2.9 and 2.11 0.5% rolls of sandpaper, 40 grit; 8; 5 and M40, but not less than 3 pcs., clause 2.9 - on all types of substrates.

(Changed edition, Amendment No. 2).

3.5. Periodic testing must be carried out at least once a year.

(Changed edition, Amendment No. 3).

4. CONTROL AND TEST METHODS

4.1 - 4.1.2. (Excluded, Amendment No. 2).

4.2. The dimensions and external defects of the working surface of the sanding paper are measured with a measuring metal ruler in accordance with GOST 427-75 or a measuring metal tape in accordance with GOST 7502-89.

4.2.1. The angle of inclination of the relief is measured using universal measuring instruments or a special template.

4.3. The unevenness of the skin thickness is measured with an MK type micrometer (with a permissible error limit of ±0.01 mm) at a distance of at least 10 mm from the edge of the roll.

(Changed edition, Amendment No. 2).

4.4. Calculation of the coefficient of application of abrasive material to the base TO n is given in the mandatory Appendix 1.

4.5. To determine the moisture content of the sanding paper, three samples measuring 100 x 100 mm are taken and weighed on technical scales with a permissible error limit of ±0.01 g. The sanding paper samples are placed in a drying cabinet and dried at a temperature of (100±5) °C until the difference between two consecutive weighings will not exceed 0.02 g.

The moisture content of the sanding paper is determined by the difference in mass before and after drying and is calculated as a percentage of the original mass.

4.6. The reduced wear of the sanding paper (the ratio of the grain size of the sanding paper to its shedding) is determined on the KZSh VNIIASH device by rubbing the sandpaper against the sandpaper for 2 minutes at a load of 29.4 N.

Two samples of sanding paper measuring 395´50 mm and 520´50 mm are tested.

Samples are weighed on technical balances with a permissible error limit of ±0.05 g.

Notes:

1. The shedding of the sanding paper is equal to the mass of the crumbling working layer in a given time interval under given conditions.

2. When calculating the reduced wear for grain size M63; M50 and M40 in the numerator are taken accordingly to the numbers 5; 4 and 3.

(Changed edition, Amendment No. 2).

4.7. The method for determining the cutting ability of abrasive paper is given in mandatory Appendix 2.

(Changed edition, Amendment No. 2).

4.9. Samples for control according to paragraphs. 4.1 - 4.8 are taken from any place on the roll that is at least 10 mm away from the end of the roll or edges. Value of indicators according to paragraphs. 4.3 and 4.5 - 4.8 is taken as the arithmetic mean of the three definitions.

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. On the non-working surface of the roll of abrasive paper, every (235±20) mm in the longitudinal and every (200±20) mm in the transverse directions must be applied:

symbol (except for the type and indication of the type of working layer);

batch number.

Notes:

1. When using a mixture of abrasive materials, mark the brand of the main abrasive material in the symbol; when using a mixture of grits, mark the main grit.

2. By agreement with the consumer, the roll dimensions may not be indicated.

(Changed edition, Amendment No. 2, 3).

5.2. Bundle markings:

hide glue - M;

combined ligament - K.

5.3. Winding the sanding paper into rolls should be smooth and dense, with the working layer facing outward, preventing the formation of wrinkles, folds and crumpled places.

The end surface must be flat, the protrusions of the edges of a roll up to 1250 mm wide should not exceed 5 mm, and over 1250 mm wide - 10 mm.

(Changed edition, Amendment No. 3).

5.4. Each roll of sanding paper must be wrapped in a double layer of paper in accordance with GOST 18277-72, GOST 2228-81 or GOST 10127-75.

The roll must be sealed at the joint. Layers of packaging paper should cover the ends of the roll and ensure its safety during transportation.

5.5. (Deleted, Amendment No. 3).

5.6. Each packaged roll must have a label or stamp with the following information:

manufacturer's trademark;

symbol;

release date and batch death;

technical control stamp;

image of the state Quality Mark according to the NTD for sanding paper, which has been assigned the state Quality Mark in accordance with the established procedure.

5.7 - 5.16. (Excluded, Change. № 3).

5.17. Other requirements for labeling and packaging, as well as transportation and storage, are in accordance with GOST 27595-88.

(Introduced additionally, Amendment No. 3).

Sec. 6. (Deleted, Amendment No. 2).

ANNEX 1
Mandatory

CALCULATION OF THE COEFFICIENT OF APPLICATION OF GRINDING MATERIAL ON THE BASE

The coefficient of application of abrasive material to the base ( TO n - the ratio of the area of the base with the applied abrasive material to its total area) for:

versions 1 and 3 is calculated by the formula

Where A- relief width, mm;

t- pitch of relief, mm;

execution 2 is calculated by the formula

execution 4 is calculated by the formula

(Changed edition, Amendment No. 1).

APPENDIX 2
Mandatory

METHOD FOR DETERMINING THE CUTTING ABILITY OF GRINDING
SKINS

1. Essence of the method

The method is based on determining the mass of organic glass sanded off by a sample of sandpaper during the test.

2. Equipment and materials

2.1. Diagram and description of the MI-2 type device - according to GOST 426-77.

2.2. Samples of sanding paper with an outer diameter of (174±5) mm and a hole diameter of (55±3) mm.

2.3. Plates made of organic glass brand TOSN - according to GOST 17622-72.

2.4. Linings made of rubber hardness Shore 60-80.

6. Validity period extended until 01/01/93 by Decree of the USSR State Standard dated 04/23/87 No. 1374

7. REISSUE (April 1990) with Amendments No. 1, 2, 3, approved in June 1984, April 1987, July 1989 (IUS 9-84, 8-87, 11-89)

State standard of the USSR GOST 6456-82

"SANDING PAPER SKIN. TECHNICAL CONDITIONS"

Abrasive paper. Specifications

Instead of GOST 6456-75

This standard applies to paper sandpaper intended for abrasive processing of various materials without cooling or using cutting fluids based on oil, kerosene, and white spirit.

1. Types and sizes

1.1. Sanding paper should be made of the following types:

1 - for machine and manual processing of non-metallic materials (wood, leather, rubber, plastic, etc.);

2 - for machine and manual processing of metals and alloys.

1.2. Sanding paper should be produced in rolls, the dimensions of which are indicated in the table. 1.

Table 1

Grain	Width, mm (limit deviation ±3.0)	Length, m (limit deviation ±0.5)

	720; 750; 800; 850; 900; 1000
	1250; 1350; 1400

	720; 750; 800; 850; 900


	1250; 1350; 1400
	720; 750; 800; 850; 900

Note. At the customer's request, it is possible to produce rolls longer than 100 m.

1.3. Sanding paper must be made with the following types of working layer:

C - solid;

R - relief.

1.4. The designs and dimensions of the relief working layer must correspond to those indicated in the drawing and in the table. 2.

table 2

Dimensions, mm

Grain	Width, a
Grain	Interval	Prev. off	Interval	Prev. off

The terrain inclination angle alpha should be 5°-85°.

1.5. The deviation from parallelism of the forming relief lines must be within the tolerance for the relief step.

An example of a symbol for paper sanding paper type 1, with a continuous working layer C, width 1000 mm, length 50 m, on paper grade 0-200, from normal electrocorundum grade 15A, grain size 25-N, on hide glue:

1S 1000X50 P2 15A 25-N M GOST 6456-82

2. Technical requirements

2.1. The abrasive paper must be manufactured in accordance with the requirements of this standard.

2.2. The abrasive paper must be made from the abrasive materials specified in table. 3.

Table 3

Type of abrasive	Abrasive grade
Normal electrocorundum	15A; 14A; F14A; 13A; F13A
White electrocorundum	25A; 24A; 23A
Alloyed electrocorundum	94A; 93A; 92A; 91A; 91A-M and 92A-M
Zirconium electrocorundum
Monocorundum
Green Silicon Carbide
Black silicon carbide	54C; 53C; 51C

Note. At the customer's request, it is possible to produce abrasive paper from other grades of abrasive materials or mixtures thereof.

2.3. To make sanding paper, paper in accordance with GOST 18277, GOST 10127 and industry specifications and technical documentation for paper should be used as a base in accordance with Table. 4.

Table 4

Paper grade	Symbol	Paper grade	Symbol

Note. If the paper does not have an established symbol, it is allowed to indicate its brand in the symbol of the sanding paper.

(Changed edition, Amendment No. 2).

2.4. The sanding paper must be made from abrasive materials of the grit sizes indicated in the table. 5.

Table 5

Note. Upon customer's request, it is possible to produce sanding paper of other grain sizes or mixtures thereof.

(Changed edition, Amendment No. 3).

2.5. The abrasive material must be bonded to the base with hide glue in accordance with GOST 3252 or other bonds in accordance with industry normative and technical documentation.

Note. It is allowed to introduce dyes or coloring pigments into the bundle.

2.6. The grain composition of grinding materials is in accordance with GOST 3647.

2.7. (Deleted, Amendment No. 3).

2.7.1. On the working surface of sanding paper with a continuous working layer, the total area of wrinkles, folds, areas without abrasive grains, filled with a binder, should not exceed 0.5% of the roll area.

Note. By agreement with the consumer, the total area of these defects is allowed to be no more than 1% of the roll area.

(Changed edition, Amendment No. 3).

2.7.3. In a roll of sanding paper with a width of up to 1250 mm, edges with a width of more than 10 mm with defects are not allowed, and with a width of more than 1250 mm - more than 15 mm.

Note. On the working surface of silicon carbide and electrocorundum sandpaper of 6-M40 grit, dotted adhesive formations or inclusions protruding above the working surface are not allowed.

(Changed edition, Amendment No. 1, 2, 3).

2.8. The uneven thickness of the sanding paper should correspond to the values indicated in the table. 6.

Table 6

2.9. The tensile strength of the sanding paper, depending on the type of paper, should correspond to the values indicated in the table. 7.

Table 7

Paper symbol	Paper symbol
Paper symbol	Paper symbol	longitudinal	transverse	longitudinal	transverse

2.10. The coefficient of applying abrasive material to the base Kn for sanding paper with a relief working layer should be 0.40-0.75.

2.11. The humidity of the sanding paper should be 3-7%.

2.12. The given wear of electrocorundum and glass abrasive cloths must correspond to the values indicated in the table. 8.

Table 8

Grain	Reduced wear for types
Grain

Note. The reduced wear of silicon carbide abrasive paper of 6-M40 grit type 1 should be 1.5-7.0; type 2 - St. 7, 0.

(Changed edition, Amendment No. 2).

2.13. The cutting ability of the sanding paper under the test conditions specified in the mandatory Appendix 2 must correspond to the values specified in table. 8a.

Table 8a

Grain	Skin cutting ability, g/min, not less
Grain	electrocorundum	silicon carbide	glass

(Changed edition, Amendment No. 2, 3).

3. Acceptance rules

3.1. Acceptance inspection and periodic testing should be carried out to verify that the abrasive paper meets the requirements of this standard.

3.2. Acceptance control for compliance with the requirements of paragraphs. 1.2, 2.7.1, 2.7.2 and 2.7.3 must be subjected to at least 1% of rolls of abrasive paper from the batch, but not less than 3 pieces, according to paragraphs. 1.4; 1.15; 2.12 and 2.13 - 0.1%, but not less than 3 pcs.

3.1, 3.2. (Changed edition, Amendment No. 2).

3.2.1. The batch must consist of abrasive paper of one specification, produced in one shift and simultaneously presented for acceptance according to one document.

3.3. If during acceptance control it is determined that there is non-compliance with the requirements of the standard for more than one controlled indicator, then the batch is not accepted.

(Changed edition, Amendment No. 2).

3.3.1. If non-compliance with the requirements of the standard is established for one of the controlled indicators, then repeated control is carried out on a double number of rolls of skins.

If there are defects in the re-sampling, the batch will not be accepted.

(Introduced additionally, Amendment No. 2).

(Changed edition, Amendment No. 2).

3.5. Periodic testing must be carried out at least once a year.

(Changed edition, Amendment No. 3).

4. Control and testing methods

4.1-4.1.2. (Excluded, Amendment No. 2).

4.2. The dimensions and external defects of the working surface of the sanding paper are measured with a measuring metal ruler in accordance with GOST 427 or a measuring metal tape in accordance with GOST 7502.

4.2.1. The angle of inclination of the relief is measured using universal measuring instruments or a special template.

4.3. The unevenness of the skin thickness is measured with an MK type micrometer (with a permissible error limit of ±0.01 mm) at a distance of at least 10 mm from the edge of the roll.

(Changed edition, Amendment No. 2).

4.4. Calculation of the coefficient of application of polished material on the base Kn is given in the mandatory Appendix 1.

4.5. To determine the moisture content of the sandpaper, three samples measuring 100x100 mm are taken and weighed on technical scales with a permissible error limit of ±0.01 g. The sandpaper samples are placed in a drying cabinet and dried at a temperature of (100±5)°C until the difference between two consecutive weighings will not exceed 0.02 g.

The moisture content of the sanding paper is determined by the difference in mass before and after drying and is calculated as a percentage of the original mass.

Two samples of sandpaper measuring 395x50 mm and 520x50 mm are tested.

Samples are weighed on technical scales with a permissible error limit of ±0.05 g.

Notes:

1. The shedding of the sanding paper is equal to the mass of the crumbling working layer in a given time interval under given conditions.

2. When calculating the reduced wear for grain size M63; M50 and M40 in the numerator are taken accordingly to the numbers 5; 4 and 3.

(Changed edition, Amendment No. 2).

4.7. The method for determining the cutting ability of abrasive paper is given in mandatory Appendix 2.

4.8. Determination of the tensile strength of the abrasive paper is carried out according to GOST 13525.1 except paragraphs. 3.1 and 4.1 at ambient temperature. The maximum deviations in the dimensions of test specimens must be ±1.0 mm.

(Changed edition, Amendment No. 2).

4.9. Samples for control according to paragraphs. 4.1-4.8 are taken from any place on the roll that is at least 10 mm away from the end of the roll or edges. Value of indicators according to paragraphs. 4.3 and 4.5-4.8 is taken as the arithmetic mean of the three definitions.

5. Labeling, packaging, transportation and storage

5.1. On the non-working surface of the roll of abrasive paper, every (235±20) mm in the longitudinal and every (200±20) mm in the transverse directions must be applied:

symbol (except for the type and indication of the type of working layer);

batch number.

Notes:

1. When using a mixture of abrasive materials, mark the brand of the main abrasive material in the symbol; when using a mixture of grits, mark the main grit.

2. By agreement with the consumer, the roll dimensions may not be indicated.

(Changed edition, Amendment No. 2, 3).

5.2. Bundle markings:

hide glue - M;

combined ligament - K.

5.3. Winding the sanding paper into rolls should be smooth and dense, with the working layer facing outward, preventing the formation of wrinkles, folds and crumpled places.

The end surface must be flat, the protrusions of the edges of a roll up to 1250 mm wide should not exceed 5 mm, and over 1250 mm wide - 10 mm.

(Changed edition, Amendment No. 3).

5.4. Each roll of sanding paper must be wrapped in a double layer of paper in accordance with GOST 18277, GOST 2228 or GOST 10127.

The roll must be sealed at the joint. Layers of packaging paper should cover the ends of the roll and ensure its safety during transportation.

5.5. (Deleted, Amendment No. 3).

5.6. Each packaged roll must be labeled or stamped with the following information:

manufacturer's trademark;

symbol;

release date and batch number;

technical control stamp;

image of the state Quality Mark according to the NTD for sanding paper, which has been assigned the state Quality Mark in accordance with the established procedure.

5.7-5.16. (Excluded, Amendment No. 3).

1. Essence of the method

The method is based on determining the mass of organic glass sanded off by a sample of sandpaper during the test.

2. Equipment and materials

2.1. Diagram and description of the MI-2 type device - according to GOST 426.

2.2. Samples of sanding paper with an outer diameter of (174±5) mm and a hole diameter of (55±3) mm.

2.3. Plates made of organic glass of the TOSN brand - according to GOST 17622.

2.4. Linings made of rubber hardness Shore 60-80.

2.5. Adhesive grades BF-2 and BF-4 in accordance with GOST 12172 or other grades that ensure the strength of the connection of organic glass plates with a rubber gasket - according to regulatory and technical documentation.

(Changed edition, Amendment No. 2).

3. Preparation for the test

3.1. Glue the plates onto the rubber pads.

3.2. First grind new organic glass plates under test conditions until signs of wear appear on the entire working surface of the plates, clean from dust and weigh with a permissible error limit of ±0.01 g.

4. Conducting the test

4.1. Set the test modes indicated in the table.

Grain	Clamping force, N	Processing time, min	Availability of airflow during processing
			Without airflow
			Without airflow
			With airflow
			With airflow

(Changed edition, Amendment No. 1, 2).

4.2. Install the test sample of abrasive paper, replacing the abrasive paper on the disk after grinding.

4.3. Secure the organic glass plates in the holders in the same position as during grinding.

4.4. At the end of the test, release the organic glass plates, clean them from dust and weigh them with a permissible error limit of ±0.01 g.

5. Processing of test results

5.1. Cutting capacity (Q, g/min) is determined by the formula

where m is the mass of ground organic glass, g;

5 - processing time, min.

Approved and put into effect

Decree of the State Standard of the USSR

STATE STANDARD OF THE USSR UNION

SANDING PAPER

TECHNICAL CONDITIONS

Abrasive paper. Specifications

GOST 6456-82

Group G25

OKP 39 8600

Validity

INFORMATION DATA

1. Developed and introduced by the Ministry of Machine Tool and Tool Industry of the USSR.

Developers: E.I. Ardashev; E.S. Wixman; V.T. Ivashinnikov; ON THE. Ilyina; V.A. Kvitko; L.A. Kogan; O.F. Kotlyarov; I.F. Korchmar; V.A. Morozov; E.B. Petrosyan; A.A. Pylnev; S.K. Rozin; V.A. Rybakov; N.V. Syreyshchikova; V.D. Tunikov; V.N. Tyrkov.

2. Approved and put into effect by Resolution of the USSR State Committee for Standards dated February 18, 1982 N 735.

3. The date of the first inspection is 1992.

The inspection frequency is 5 years.

4. Instead of GOST 6456-75.

5. Reference regulatory and technical documents

────────────────────────────────────┬─────────────────────────────

Designation of technical documentation,│Number of item, subitem,

────────────────────────────────────┼─────────────────────────────

GOST 426-77│Appendix 2

GOST 427-75│4.2

GOST 2228-81│5.4

GOST 3252-80│2.5

GOST 3647-80│2.6

GOST 7502-89│4.2

GOST 10127-75│2.3; 5.4

GOST 12172-74│Appendix 2

GOST 13525.1-79│4.8

GOST 17622-72│Appendix 2

GOST 18277-72│2.3; 5.4

GOST 27595-88│5.17

6. Validity period extended until 01/01/1993 by Decree of the USSR State Standard of 04/23/1987 N 1374.

7. Reissue (April 1990) with Amendments No. 1, 2, 3, approved in June 1984, April 1987, July 1989 (IUS 9-84, 8-87, 11-89).

This standard applies to paper sandpaper intended for abrasive processing of various materials without cooling or using cutting fluids based on oil, kerosene, and white spirit.

1. TYPES AND SIZES

1.1. Sanding paper should be made of the following types:

1 - for machine and manual processing of non-metallic materials (wood, leather, rubber, plastic, etc.);

2 - for machine and manual processing of metals and alloys.

1.2. Sanding paper should be produced in rolls, the dimensions of which are indicated in the table. 1.

Table 1

───────────┬────────────────────────────────┬─────────────────────

Grit│Width, mm (maximum deviation +/- 3.0)│Length, m (maximum deviation.

│ 720; 750; 800; 850; 900; 1000│30

40 - 16│1250; 1350; 1400│

───────────┼────────────────────────────────┤

40; 32│1000│

───────────┼────────────────────────────────┼─────────────────────

40 - 16│720; 750; 800; 850; 900│50

───────────┼────────────────────────────────┤

25 - 10│1000│

───────────┼────────────────────────────────┤

12 - M40 │1250; 1350; 1400│

├────────────────────────────────┼─────────────────────

│720; 750; 800; 850; 900│100

───────────┼────────────────────────────────┤

8 - M40 │1000│

Note. At the customer's request, it is possible to produce rolls longer than 100 m.

1.3. Sanding paper must be made with the following types of working layer:

C - solid;

R - relief.

1.4. The designs and dimensions of the relief working layer must correspond to those indicated in the drawing and in the table. 2.

Version 1

Version 2

Version 3

Version 4

table 2

Dimensions, mm

─────────────┬────────────────────┬───────────────────────────────

Grit │Width, a│Pitch, t

├────────────┬───────┼──────────────┬────────────────

│Interval│ Prev. │Interval│Prev. off

││ off ││

50 - 40│ 3,0 - 15,0 │+/- 1,0│4,0 - 38,0│+/- 2,0

─────────────┼────────────┤├──────────────┤

32 - 25│ 1,5 - 12,0 ││3,0 - 30,0│

─────────────┼────────────┼───────┼──────────────┼────────────────

20 - 16│ 1,0 - 10,0 │+/- 0,3│2,5 - 25,0│+/- 1,0

─────────────┼────────────┤├──────────────┼────────────────

12 - M40│ 0.5 - 5.0││1.0 - 20.0│+/- 0.5

The angle of inclination of the relief should be 5° - 85°.

1.5. The deviation from parallelism of the forming relief lines must be within the tolerance for the relief step.

An example of a symbol for a type 1 paper sandpaper, with a continuous working layer C, 1000 mm wide, 50 m long, on grade 0-200 paper, made from normal electrocorundum grade 15A, grain size 25-N, on hide glue:

1S 1000 X 50 P2 15A 25-N M GOST 6456-82

2. TECHNICAL REQUIREMENTS

2.1. The abrasive paper must be manufactured in accordance with the requirements of this standard.

2.2. The abrasive paper must be made from the abrasive materials specified in table. 3.

Table 3

Type of abrasive│Brand of abrasive

Normal electrocorundum│15A; 14A; F14A; 13A; F13A

White electrocorundum│25A; 24A; 23A

Alloyed electrocorundum│94A; 93A; 92A; 91A; 91A-M and 92A-M

Zirconium electrocorundum│38A

Monocorundum│44A; 43A

Green silicon carbide│64C; 63С

Black silicon carbide│54C; 53C; 51C

Glass│71St

Note. At the customer's request, it is possible to produce abrasive paper from other grades of abrasive materials or mixtures thereof.

Table 4

────────────────┬─────────────────┬─────────────────┬─────────────

Paper brand│Conditional│Paper brand│Conditional

│designation││ designation

────────────────┼─────────────────┼─────────────────┼─────────────

0-140│P1│BSh-140│P6

0-200│P2│BSh-200│P7

0-210│P3│BSh-240│P8

0-235│P4│BV-225│P9

0-240│P5│BVK-225│P10

││OV-200│P11

Note. If the paper does not have an established symbol, it is allowed to indicate its brand in the symbol of the sanding paper.

(Changed edition, Amendment No. 2).

2.4. The sanding paper must be made from abrasive materials of the grit sizes indicated in the table. 5.

Table 5

─────────────┬────────────────────────────────────────────────────

Conditional│Grain

designation ├──────────────┬───────────┬─────────── ───┬────── ────

paper│electrocorundum-│monocorundum│carbide│glass

│fuel││silicon│

│grinding materials│││

─────────────┼──────────────┼───────────┼──────────────┼──────────

P2; P3; P4; │50-M40│50 - 6│25-M40│50 - 6

P5; P7; P8; ││││

P9; P10; P11││││

─────────────┼──────────────┤├──────────────┼──────────

P1; P6│25-M40││16-M40│25 - 6

Note. Upon customer's request, it is possible to produce sanding paper of other grain sizes or mixtures thereof.

(Changed edition, Amendment No. 3).

2.5. The abrasive material must be bonded to the base with hide glue in accordance with GOST 3252-80 or other bonds in accordance with industry normative and technical documentation.

Note. It is allowed to introduce dyes or coloring pigments into the bundle.

2.6. The grain composition of grinding materials is in accordance with GOST 3647-80.

2.7. (Deleted, Amendment No. 3).

Note. By agreement with the consumer, the total area of these defects is allowed to be no more than 1% of the roll area.

(Changed edition, Amendment No. 3).

2.7.3. In a roll of sanding paper with a width of up to 1250 mm, edges with a width of more than 10 mm with defects are not allowed, and with a width of more than 1250 mm - more than 15 mm.

Note. On the working surface of silicon carbide and electrocorundum sandpaper of 6-M40 grit, dotted adhesive formations or inclusions protruding above the working surface are not allowed.

(Changed edition, Amendment No. 1, 2, 3).

2.8. The uneven thickness of the sanding paper should correspond to the values indicated in the table. 6.

Table 6

────────────────────────────────┬─────────────────────────────────

Grain size│ Thickness unevenness, mm, not

────────────────────────────────┼─────────────────────────────────

M63 - M40│0.06

2.9. The tensile strength of the sanding paper, depending on the type of paper, should correspond to the values indicated in the table. 7.

Table 7

──────────┬─────────────────────┬───────────┬─────────────────────

Conditional│ Breaking load, │ Conditional│ Breaking load,

designation - │Н, no less, in│designation│Н, no less, in

paper│directions│paper│directions

├──────────┬──────────┤├──────────┬──────────

│longitudinal│transverse││longitudinal│transverse

P1│196.0│107.8│P7│225.4│117.6

──────────┼──────────┼──────────┼───────────┼──────────┼──────────

P2│245.0│137.2│P8│274.4│137.2

──────────┼──────────┼──────────┼───────────┼──────────┼──────────

P3│294.0│156.8│P9│401.8│175.5

──────────┤│├───────────┼──────────┼──────────

P4│││P10│372.4│157.0

──────────┼──────────┼──────────┼───────────┼──────────┼──────────

P5│392.0│98.0│P11│225.5│117.6

──────────┼──────────┤│││

P6│176.4││││

2.10. The coefficient of application of abrasive material to the base for abrasive paper with a relief working layer should be 0.40 - 0.75.

2.11. The humidity of the sanding paper should be 3 - 7%.

2.12. The given wear of electrocorundum and glass abrasive cloths must correspond to the values indicated in the table. 8.

Table 8

─────────────────────┬────────────────────────────────────────────

Grit│Reduced wear for types

├────────────────────┬───────────────────────

─────────────────────┼────────────────────┼───────────────────────

50 - 32│5.0 - 20.0│St. 20.0

25 - 16│4,0 - 15,0│"15,0

12 - 6│2,0 - 11,0│"11,0

5 - M40│1.5 - 9.0│"9.0

Note. The reduced wear of silicon carbide grinding paper with grit size 6 - M40 type 1 should be 1.5 - 7.0; type 2 - St. 7.0.

(Changed edition, Amendment No. 2).

2.13. The cutting ability of the sanding paper under the test conditions specified in the mandatory Appendix 2 must correspond to the values specified in table. 8a.

Table 8a

───────────────┬──────────────────────────────────────────────────

Grain size│Skin cutting ability, g/min, not less

├─────────────────┬─────────────────┬──────────────

│electrocorundum│silicon carbide │glass

50│0,422│0,450│0,300

───────────────┼─────────────────┼─────────────────┼──────────────

40│0,300│0,320│0,260

───────────────┤││

───────────────┼─────────────────┼─────────────────┼──────────────

25│0,290│0,300│0,250

───────────────┼─────────────────┼─────────────────┼──────────────

20│0,200│0,220│0,160

───────────────┼─────────────────┼─────────────────┼──────────────

16│0,195│0,210│0,110

───────────────┼─────────────────┼─────────────────┼──────────────

12│0,187│0,205│0,080

───────────────┼─────────────────┼─────────────────┼──────────────

10│0,176│0,200│0,070

───────────────┼─────────────────┼─────────────────┼──────────────

8│0,151│0,195│0,060

───────────────┼─────────────────┼─────────────────┼──────────────

6│0,100│0,192│-

5│0,079│-│

───────────────┼─────────────────┤│

───────────────┼─────────────────┼─────────────────┤

M63│0.079│0.066│

───────────────┼─────────────────┼─────────────────┤

M50│0.038│0.025│

───────────────┼─────────────────┼─────────────────┤

M40│0.014│0.021│

(Changed edition, Amendment No. 2, 3).

3. ACCEPTANCE RULES

3.1. Acceptance inspection and periodic testing should be carried out to verify that the abrasive paper meets the requirements of this standard.

3.1, 3.2. (Changed edition, Amendment No. 2).

3.2.1. The batch must consist of abrasive paper of one specification, produced in one shift and simultaneously presented for acceptance according to one document.

3.3. If during acceptance control it is determined that there is non-compliance with the requirements of the standard for more than one controlled indicator, then the batch is not accepted.

(Changed edition, Amendment No. 2).

3.3.1. If non-compliance with the requirements of the standard is established for one of the controlled indicators, then repeated control is carried out on a double number of rolls of skins.

If there are defects in the re-sampling, the batch will not be accepted.

(Introduced additionally, Amendment No. 2).

(Changed edition, Amendment No. 2).

3.5. Periodic testing must be carried out at least once a year.

(Changed edition, Amendment No. 3).

4. CONTROL AND TEST METHODS

4.1 - 4.1.2. (Excluded, Amendment No. 2).

4.2.1. The angle of inclination of the relief is measured using universal measuring instruments or a special template.

4.3. The unevenness of the skin thickness is measured with an MK type micrometer (with a permissible error limit of +/- 0.01 mm) at a distance of at least 10 mm from the edge of the roll.

(Changed edition, Amendment No. 2).

4.4. The calculation of the coefficient of application of abrasive material to the base is given in the mandatory Appendix 1.

4.5. To determine the moisture content of the sanding paper, three samples measuring 100 x 100 mm are taken and weighed on technical scales with a permissible error limit of +/- 0.01 g. The sanding paper samples are placed in a drying cabinet and dried at a temperature of (100 +/- 5) °C until the difference between two consecutive weighings does not exceed 0.02 g.

The moisture content of the sanding paper is determined by the difference in mass before and after drying and is calculated as a percentage of the original mass.

Two samples of sandpaper measuring 395 x 50 mm and 520 x 50 mm are tested.

Samples are weighed on technical balances with a permissible error limit of +/- 0.05 g.

Notes. 1. The shedding of the sanding paper is equal to the mass of the crumbling working layer in a given time interval under given conditions.

2. When calculating the reduced wear for grain size M63; M50 and M40 in the numerator are taken accordingly to the numbers 5; 4 and 3.

(Changed edition, Amendment No. 2).

4.7. The method for determining the cutting ability of abrasive paper is given in the mandatory Appendix 2.

(Changed edition, Amendment No. 2).

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. On the non-working surface of the roll of abrasive paper, every (235 +/- 20) mm in the longitudinal direction and every (200 +/- 20) mm in the transverse direction must be applied:

symbol (except for the type and indication of the type of working layer);

batch number.

Notes. 1. When using a mixture of abrasive materials, mark the brand of the main abrasive material in the symbol; when using a mixture of grits, mark the main grit.

2. By agreement with the consumer, the roll dimensions may not be indicated.

(Changed edition, Amendment No. 2, 3).

5.2. Bundle markings:

hide glue - M;

combined ligament - K.

5.3. Winding the sanding paper into rolls should be smooth and dense, with the working layer facing outward, preventing the formation of wrinkles, folds and crumpled places.

The end surface must be flat, the protrusions of the edges of a roll up to 1250 mm wide should not exceed 5 mm, and over 1250 mm wide - 10 mm.

(Changed edition, Amendment No. 3).

5.4. Each roll of sanding paper must be wrapped in a double layer of paper in accordance with GOST 18277-72, GOST 2228-81 or GOST 10127-75.

The roll must be sealed at the joint. Layers of packaging paper should cover the ends of the roll and ensure its safety during transportation.

5.5. (Deleted, Amendment No. 3).

5.6. Each packaged roll must be labeled or stamped with the following information:

manufacturer's trademark;

symbol;

release date and batch number;

technical control stamp;

image of the state Quality Mark according to the NTD for sanding paper, which has been assigned the state Quality Mark in accordance with the established procedure.

5.7 - 5.16. (Excluded, Amendment No. 3).

5.17. Other requirements for labeling and packaging, as well as transportation and storage, are in accordance with GOST 27595-88.

(Introduced additionally, Amendment No. 3).

Sec. 6. (Deleted, Amendment No. 2).

Annex 1

Mandatory

CALCULATION OF THE RATIO OF APPLICATION OF GRINDING MATERIAL ON THE BASE

The coefficient of application of abrasive material to the base (the ratio of the area of the base with the applied abrasive material to its total area) for:

versions 1 and 3 is calculated by the formula

where a is the width of the relief, mm;

t - relief step, mm;

execution 2 is calculated by the formula

execution 4 is calculated by the formula

(Changed edition, Amendment No. 1).

Appendix 2

Mandatory

METHOD FOR DETERMINING THE CUTTING ABILITY OF GRINDING FILTH

1. Essence of the method

The method is based on determining the mass of organic glass sanded off by a sample of sandpaper during the test.

2. Equipment and materials

2.1. Diagram and description of the MI-2 type device - according to GOST 426-77.

2.2. Samples of sanding paper with an outer diameter of (174 +/- 5) mm and a hole diameter of (55 +/- 3) mm.

2.3. Plates made of organic glass of the TOSN brand - in accordance with GOST 17622-72.

2.4. Linings made of rubber hardness Shore 60 - 80.

2.5. Adhesive grades BF-2 and BF-4 in accordance with GOST 12172-74 or other grades that ensure the strength of the connection of organic glass plates with a rubber gasket - according to regulatory and technical documentation.

(Changed edition, Amendment No. 2).

3. Preparation for the test

3.1. Glue the plates onto the rubber pads.

4. Conducting the test

4.1. Set the test modes indicated in the table.

───────────────┬─────────────────┬─────────────────┬──────────────

Grain size│Clamping force, N│ Processing time,│Availability of airflow

││min│ during processing

───────────────┼─────────────────┼─────────────────┼──────────────

80 - 50│98.0│5│Without blowing

40 - 25│72,5│├──────────────

20 - 6│49.0││With airflow

5 - M40│25.5││

(Changed edition, Amendment No. 1, 2).

4.2. Install the test sample of abrasive paper, replacing the abrasive paper on the disk after grinding.

4.3. Secure the organic glass plates in the holders in the same position as during grinding.

4.4. At the end of the test, remove the organic glass plates, clean them from dust and weigh them with a permissible error limit of +/- 0.01 g.

5. Processing of test results

5.1. Cutting capacity (Q g/min) is determined by the formula

where m is the mass of ground organic glass, g;

5 - processing time, min.

STATE STANDARD OF THE USSR UNION

Validity from 01.01.83

This standard applies to paper sandpaper intended for abrasive processing of various materials without cooling or using cutting fluids based on oil, kerosene, and white spirit.

1. TYPES AND SIZES

1.1. Sanding paper should be made of the following types:

1 - for machine and manual processing of non-metallic materials (wood, leather, rubber, plastic, etc.);

2 - for machine and manual processing of metals and alloys.

Grain	Width, mm (limit deviation±3.0)	Length, m (limit deviation ±0.5)
	1250
	720; 750; 800; 850; 900; 1000
40-16	1250; 1350; 1400
40; 32	1000
40-16	720; 750; 800; 850; 900
25-10	1000

12-M40	1250; 1350; 1400
12-M40	720; 750; 800; 850; 900
8-M40	1000

Note . Upon customer's request, it is possible to produce rolls longer than 100 m

1.3. Sanding paper must be made with the following types of working layer:

C - solid;

Dimensions, mm

Grain	Width, A		Step, t
Grain	Interval	Prev. off	Interval	Prev. off
50-40	3.0-15,0	±1.0	4,0-38,0	±2.0
32-25	1,5-12,0	±1.0	3.0-30,0	±2.0
20-16	1.0-10,0	±0.3	2,5-25,0	± 1.0
12-M40	0,5-5,0	±0.3	1,0-20,0	±0.5

The terrain inclination angle a should be 5° - 85°.

Example of a symbol paper abrasive type 1, with a continuous working layer C, 1000 mm wide. 50 m long, on paper grade 0-290, from normal electrocorundum grade 15A, grain size 25-N, on hide glue:

1S 1000´ 50 P2 15A 25-N M GOST 6456-82

2. TECHNICAL REQUIREMENTS

2.1. The abrasive paper must be manufactured in accordance with the requirements of this standard.

2.2. The abrasive paper must be made from the abrasive materials specified in table. .

Type of abrasive	Abrasive grade
Normal electrocorundum	15A; 14A; F14A; 13A; F13A
White electrocorundum	25A; 24A; 23A
Alloyed electrocorundum	94A; 93A; 92A; 91A; 91A-M and 92A-M
Zirconium electrocorundum	38A
Monocorundum	44A; 43A
Green Silicon Carbide	64C; 63C
Black silicon carbide	54C; 53C; 51C
Glass	71 St

Note . At the customer's request, it is possible to produce abrasive paper from other grades of abrasive materials or mixtures thereof.

Paper grade	Symbol	Paper grade	Symbol
0-140		BS-140
0-200		BS-200
0-210		BS-240
0-235		BV-225
0-240		BVK-225	P10
		OV-200	P11

Note . If the paper does not have an established symbol, it is allowed to indicate its brand in the symbol of the sanding paper.

(Changed edition, Amendment No. 2).

2.4. The sanding paper must be made from abrasive materials of the grit sizes indicated in the table. .

Paper symbol	Grain
Paper symbol	electrocorundum abrasives	monocorundum	silicon carbide	glass
P2: P3; P4; P5: P7; P8; P9; P10; P11	50-M40	50-6	25-M40	50-6
P1; P6	25-M40	50-6	16-M40	25-6

Note . Upon customer's request, it is possible to produce sanding paper of other grain sizes or mixtures thereof.

(Changed edition, Amendment No. 3).

2.7. (Deleted, Amendment No. 3).

(Changed edition, Amendment No. 3).

Note . On the working surface of silicon carbide and electrocorundum abrasive paper of 6-M40 grit, dotted adhesive formations or inclusions protruding above the working surface are not allowed.

(Changed edition, Amendment No. 1, 2, 3).

Grain	Thickness unevenness, mm, no more
	0,20
40-20	0,12
16-10	0,10
	0,03
M63-M40	0,06

Paper symbol	Paper symbol
Paper symbol	Paper symbol	longitudinal	transverse	longitudinal	transverse
	196,0	107,8		225,4	117,6
	245,0	157,2		274,4	137,2
	294,0	156,8		401,8	175,5
	294,0	156,8	P10	372,4	157,0
	392,0	93,0	P11	225,5	117,6
	176,4	93,0	P11	225,5	117,6

Grain	Reduced wear for types
Grain
50-32	5,0-20,0	St. 20.0
25-16	4,0-15,0	» 15.0
12-6	2,0-11,0	» 11.0
5-M40	1,5-9,0	» 9.0

Note . The reduced wear of silicon carbide grinding paper of 0-M40 grit type 1 should be 1.5-7.0; type 2 - St. 7.0.

(Changed edition, Amendment No. 2).

Grain	Skin cutting ability, g/min, not less
Grain	electrocorundum	silicon carbide	glass
	0,422	11,450	0,300
	0,300	0,320	0,260
	0,300	0,320	0,260
	0,290	0,300	0,250
	0,200	0,220	0,160
	0,195	0,210	0,110
	0,187	0,205	0,080
	0,176	0,200	0,070
	0,151	0,195	0,060
	0,100	0,192
	0,079	-
	0,041	-
M63	0,079	0,066
M50	0,038	0.025
M40	0,014	0,021

(Changed edition, Amendment No. 2, 3).

3. ACCEPTANCE RULES

3.1. Acceptance inspection and periodic testing should be carried out to verify that the abrasive paper meets the requirements of this standard.

4.2.1. The angle of inclination of the relief is measured using universal measuring instruments or a special template.

(Changed edition, Amendment No. 2).

4.4. Calculation of the coefficient of application of abrasive material to the base TO n is given in the mandatory appendix.

The roll must be sealed at the joint. Layers of packaging paper should cover the ends of the roll and ensure its safety during transportation.

5.5. (Deleted, Amendment No. 3).

5.6. Each packaged roll must have a label or stamp with the following information:

manufacturer's trademark;

symbol;

release date and batch death;

technical control stamp;

image of the state Quality Mark according to the NTD for sanding paper, which has been assigned the state Quality Mark in accordance with the established procedure.

5.7 - 5.16. (Excluded, Change. № 3).

5.17. Other requirements for labeling and packaging, as well as transportation and storage - according to