Sanding paper, grit 40 25. Sanding paper (sanding paper). paper-based sandpaper

Sandpaper is an abrasive material applied to a fabric or paper base and is an indispensable assistant for a wide range of home craftsman projects.

Let's look at the symbols with which the manufacturer informs us about the types of sandpaper and the permissible areas of its use.

Sandpaper grit

This parameter of abrasive paper displays the number and size of particles of abrasive substance per unit area, is the main characteristic of the sandpaper and determines the possibility of its use for certain needs.

What's the difficulty?

Today in stores you can find sanding paper labeled as Russian GOST as well as the standards of other countries.

The confusion is that domestic markings on the skin can be done in a new way GOST from 2005(focused on European standards) and according to GOST 80s years approved by the Ministry of Machine Tool and Tool Industry USSR.

The two categories of standards are inverse. IN old GOST 3647-80 decreasing marking numbers indicated decreasing grain size. IN new GOST The abrasive grain decreases, and the number in the marking, on the contrary, increases.

In addition, there is no unity among global manufacturers. The USA and Canada, Europe and Türkiye, Japan, China adhere to their own standard.

Table of grain size, purpose and marking

GOST R 52381-2005 (Russia)	GOST 3647-80 (USSR)	Grain size (µm)	Purpose
Coarse-grained
P22	80-H	800-1000	Roughing
P24	63-H	630-800
P36	50-H	500-630
P40	40-H	400-500	Rough woodwork
P46	32-H	315-400
P60	25-H	250-315
P80	20-H	200-250	Primary grinding Surface smoothing Removing small irregularities
P90	16-H	160-200
P100	12-H	125-160
P120	10-H	100-125
P150	8-H	80-100	Preparing hard wood for sanding Final sanding of soft wood Sanding old paint for painting
P180	6-H	63-80
Fine-grained
P240	5-H,M63	50-63	Final sanding of hardwood Sanding between coats
P280	4-N,M50	40-50	Final sanding of hardwood Sanding between coats
P400	M40/N-3	28-40	Polishing final coats Sanding before painting Wet sanding
P600	M28/H-2	20-28	Polishing final coats Sanding before painting Wet sanding
P1000	M20/H-1	14-20	Grinding of metal, plastics, ceramics Wet sanding
P1200	M14	10-14	Even finer grinding, polishing Removing gloss, stains, micro-scratches
P1500	M10/N-0	7-10
P2000	M7/N-01	5-7
P2500	M5/N-00	3-5

Russian marking. GOST old and new (ISO)

New GOST

The letter is always listed first "R". The number after indicates the grain size.

For example: P400- this is the well-known “zero”.

Old GOST

The first number is the number indicating the size of the abrasive. Next are the indices: P means that the amount of the main fraction of abrasive grain is not less than 55% , index N- no less 45% , index D- no less 41% .

8-P indicates that the number of abrasive granules that pass through the sieve with the mesh side 80 µm. no less 55% .

To designate micro-grinding powders in the old GOST the letter comes first M. The number behind it is the grain size in microns.

For example, the same “zero”: M40

This is what the back side of the sandpaper I purchased just yesterday looks like:

(Below I posted a photo with the new markings)

Areas of application of abrasive skins in accordance with the type of grain size.

1. Sandpaper with coarse grain (coarse-grained - macrogrid)

The roughest jobs. Removing burrs and rust. (corn 1000 µm - 500 µm)

New GOST: P22, P24, P30, P36 (hereinafter the sequence is given in order of decreasing grain, i.e. P22- largest grain ( 1000 µm), P36- least ( 500 µm))

Old GOST: 80-P, 63-P, 50-P (hereinafter in order of decreasing grain, i.e. 80 - largest grain ( 1000 µm), 50 - least ( 500 µm))

Rough woodworking. Pre-grinding of various surfaces ( 500 - 250 µm)

New GOST: P40, P46, P54, P60

Old GOST: 40-P, 32-P, 25-P

Removing a layer of varnish, paint or drying oil. Elimination of uneven plaster. Intermediate grinding ( 250 - 100 µm)

New GOST: P70, P80, P90, P100

Old GOST: 20-P, 16-P, 12-P, 10-P

Final sanding. ( 50 - 105 µm)

New GOST: P120, P150, P180, P220

Old GOST: 20-P, 16-P, 12-P, 10-P

2. Sandpaper with fine grain (fine-grain - microgrid)

Fine grinding ( 60 - 40 µm)

New GOST: P240, P280, P320, P360

Old GOST: 5-P, 4-P.

Polishing, “wet” grinding (using lubricants and cooling liquids). ( 40-20 microns)

New GOST: P400, P500, P600, P800

Old GOST: M40, M28, M20

Grinding of metal, plastic, ceramics. Finishing processing of any type of wood, leather products. ( 20-14 microns)

New GOST: P1000, P1200

Old GOST: M20

Ultra-fine grinding, polishing of corrosion-resistant steels, production of micro-sections. ( 14-3 microns)

New GOST: P1500, P2000, P2500

Old GOST: M14, M10, M7, M5

It is also useful to understand what types of sandpaper are divided into in addition to the size of the abrasive grain and how this affects its functionality and cost.

Abrasive material

I wasn’t too lazy to photograph the underside of the skin of which birdhouse processed.

Line resin bonded- abrasive material, grinding material (according to the English - Russian dictionary of mechanical engineering and production automation)

If you look at the back of your sandpaper, you will most likely see a similar simple inscription aluminum oxide what does aluminum oxide mean? in common parlance, electrocorundum). A possible option is silicon carbide or ceramic abrasive.

The first is a brittle material and is used for processing wood, alloy steel, and cast iron.

Second ( silicon carbide) has high hardness and is designed to work with glass, plastic, and metal.

As a rule, this knowledge is enough for the general consumer to do housework, but we general development We suggest covering the topic more broadly:

Areas of application of abrasives according to the type of abrasive material

Electrocorundum normal(93-96% Al 2 O 3 - for example 16A) such skins are intended for malleable cast iron, hardened and non-hardened steels, and wood.

Electrocorundum white(Al 2 O 3 no more than 99% - for example 25A) - for processing heat-resistant and alloy steels.

Silicon carbide(for example 64C) - finishing processing of metal, cast iron, bronze, aluminum, plastic, marble, granite, glass, wood.

Flint(for example 81K) - for processing wood, plywood, leather.

Glass(for example 71C) - for processing wood, plywood, felt, felt.

Pomegranate- for processing hard deciduous wood (oak, beech, etc.).

Elbor- for polishing precision surfaces and hard-to-machine steel parts.

Diamond- for polishing and fine honing of precision parts made of carbide and cast iron.

Type of sandpaper base

1. paper-based sandpaper

This sandpaper has a fairly low wear resistance coefficient. Along with a low safety margin, paper-based emery, as a rule, does not have water-resistant properties.

P1, P2, PZ... before PI- non-waterproof paper.

This greatly narrows the scope of application, but also reduces the market value.

2. cloth sandpaper

Today, the most common base fabrics are cotton and polyester. Fabric-based abrasives most often have water-resistant properties due to a special resin-based impregnation.

L1, L2 And M- moisture-resistant paper.

Such sandpapers have a higher safety margin compared to paper ones.

In the marking with the first digit, the manufacturer can indicate 1 or 2 .

1 - the sandpaper is intended for materials of low hardness (putty, primer, paint, enamel, soft wood, plastic)

2 - for hard metal alloys.

There is also sandpaper with a mixed base (fabric + paper) or other materials (for example, fiber-based discs are widespread).

Type of abrasive application

1. sandpaper with a semi-open or open abrasive layer

The base is half closed. The gaps between the particles are covered 40 to 60% base area. This abrasive is used for processing soft and friable materials.

No lumps are formed during operation, which prevents clogging of empty spaces with waste.

2. sandpaper with a closed or continuous abrasive layer

It is characterized by complete coverage of the base with abrasive material and is designed for use on hard surfaces.

Full explanation of sandpaper markings

So, we already understand something and can try to read what the manufacturer had in mind.

For example, this marking ( old GOST)

Example: 2 830x50 S2G 24A 40-NMA GOST 5009-82.

Abrasive for processing hard metal alloys ( 2 ), on a roll ( 830 mm at 50 m) on a fabric basis - twill ( S2G), from electrocorundum ( 24A), with a grain size of 40 µm ( 40-N), on hide glue ( M).

Explanation

Binder type: M— flesh glue; WITH— synthetic resin; TO- combined ligament.

In the old GOST, the sixth letter indicated the class of the abrasive - the number of defects. A no more 0,5% ; B- no more 2% ; IN- no more 3% .

Therefore, the number of defects ( A) on the working surface of our example no more 0,5% .

or (new European standard using German VSM sandpaper as an example)

Example: KK X P150

Electrocorundum abrasive ( K) on fabric ( TO) and hard ( X) basis with grain P150(75-106 microns).

Today, JSC Volzhsky Grinding Material-Volga is a seller of a wide range of grinding materials.

Having a direct agreement with OJSC "Volzhsky Abrasive Plant" (JSC "VAZ"), Volzhsky and OJSC "Belgorod Abrasive Plant" (JSC "BAZ"), Belgorod, we are ready to offer you the products listed below from a warehouse in Volzhsky, Volgograd region

In order to expand the range of products, we have the opportunity to carry out custom deliveries of products from the company KWH Mirka Ltd - Finland, which produces flexible grinding materials for high-quality grinding.

1. Waterproof cloth sanding paper

Waterproof fabric sanding paper is used for manual and machine abrasive processing. various materials, including difficult to process, with high loads with the use of coolant based on water, oil emulsions, as well as grinding without coolant, coolant based on kerosene and white alcohol cannot be used when grinding in order to avoid softening of the synthetic waterproof coating on the non-working side of the fabric base and reducing the water resistance of the sandpaper.

Manufacturer:

Type of skin	Sanding material
Type of skin	Grain	Brand
Waterproof cloth sanding paper GOST 13344-79 Roll width 900; 775 mm for grain size 100-63 - rolls of 20 linear. m. for grain size 50-M40 - rolls of 30 linear. m.	P20 (No. 100)	A (14A
	P24 (No. 80)	A (14A
	P30 (No. 63)	A (14A
	P36 (No. 50)	A (14A
	P40 (No. 40), P50 (No. 32)	A (14A
	P 60 (No. 25), P70 (No. 20)	A (14A)
	Р80(№16)	A (14A
	P100(No. 12). P120(No. 10)	A (14A
	P150(No. 8). P180(No. 6)	A (14A)
	R 220 (No. 5), R320 (No. 4)	A (14A)
	R 400 (No. M40)	A (14A)

2. Sanding paper, non-waterproof

Non-waterproof paper sanding paper is used for manual and machine abrasive processing of resinous and soft wood, plastics, hard paint coatings, car bodies, rubber using coolant based on oil, kerosene, white alcohol, as well as grinding without coolant.

Manufacturer: JSC "Belgorod Abrasive Plant" (JSC "BAZ") Belgorod

3. Waterproof paper sanding paper

Waterproof paper sanding paper is intended for wet and dry sanding of paint and varnish coatings, putties, primers, plastics, ferrous and non-ferrous metals, glass, ceramics, porcelain, rubber, especially suitable for processing car bodies.

Manufacturer: JSC "Belgorod Abrasive Plant" (JSC "BAZ") Belgorod

4. Sanding paper in sheets

Sanding paper in sheets is produced on a paper and fabric basis. Now it is difficult to imagine sanding a wooden surface, performing body work, processing a varnished surface, putty, paint, or metal without the use of sanding paper or sandpaper on a cloth. Sanding paper is produced by applying abrasive grain in an electro-static magnetic field. Elastic waterproof sanding paper Suitable for dry or wet sanding. Sandpaper has a grain size from P60 to P2000, sandpaper on a fabric basis from P600.

Manufacturer: JSC "Belgorod Abrasive Plant" (JSC "BAZ") Belgorod

GOST 13344-79

INTERSTATE STANDARD

GRINDING PAPER
FABRIC WATERPROOF

TECHNICAL CONDITIONS

IPC PUBLISHING HOUSE OF STANDARDS
Moscow

INTERSTATE STANDARD

Date of introduction 01.01.81

This standard applies to waterproof cloth abrasives intended for abrasive processing of various materials with and without the use of a cutting fluid based on water, oil, kerosene, etc.

1. TYPES AND SIZES

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

1 - for machine and manual processing wood, plastics, varnish coatings and alloys with low hardness;

2 - for machine and manual processing of hard and highly viscous metals and alloys.

1.2. (Deleted, Amendment No. 1).

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

O - single-layer;

D - two-layer.

Grain

Width, mm (limit deviation ±15)

Length, mm (limit deviation ±0.3)

50-M40

600; 725; 745; 775; 800; 820; 840

20; 30

50-M40

725; 745; 775; 800; 820; 840

Notes:

1. At the customer’s request, it is allowed to produce rolls with a width of more than 840 mm and a length of more than 30 m.

2. At the customer’s request, it is allowed to produce sanding paper from other grades and grain sizes of abrasive materials or mixtures thereof.

Example of a symbolwaterproof fabric two-layer sanding paper type 2, 820 mm wide, 20 m long, on a fabric base made of plain-dyed weighted twill, from green silicon carbide grade 63C, grit size 40-N and 25-P, on phenol-formaldehyde resin:

D2 820´ 20 UG 63S 40-N/25-P SFZh GOST 13344-79

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

2. TECHNICAL REQUIREMENTS

2.1. The sanding paper should be made of normal electrocorundum grades 15A, 14A and 13A; white electrocorundum grades 25A, 24A and 23A; black silicon carbide grades 55C, 54C and 53C; green silicon carbide grades 64C and 63C.

For skins of other grain sizes, the total area of these defects should be no more than 1% of the roll area.

Edges with a width of more than 10 mm with defects are not allowed in a roll of skins.

(Changed edition, Change No. 3).

2.7. (Excluded, Change No. 1).

Thickness unevenness, mm, no more

0,28

40; 32

0,15

25; 20

0,08

16 - 10

0,06

8 and smaller

0,05

_________

* Table 2. (Deleted, Amendment No. 1).

(Changed edition, Amendment No. 1).

Breaking load, N, not less, in directions

Elongation at break in the longitudinal direction, %, no more

longitudinal

transverse

1764

S1G

1127

1372

Note . Values of breaking load and elongation of tissues not provided for in Table. , must be no less than for fabric P.

2.10. Indicators of the strength of fixation of abrasive grains are indicated in the Appendix.

(Changed edition, Change No. 3).

Cutting capacity, mm 3 /min, not less

silicon carbide

electrocorundum

40/25

M63

M50

M40

2.11 - 2.12. (Introduced additionally, Change No. 3).

3. ACCEPTANCE RULES

3.1. To monitor compliance of the abrasive paper with the requirements of this standard, acceptance inspection and periodic testing are carried out.

(Changed edition, Change No. 3).

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.

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

(Changed edition, Change No. 3).

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

(Changed edition, Change No. 3).

4. CONTROL AND TEST METHODS

(Changed edition, Amendment No. 1,).

4.2. The method for determining the cutting ability of grinding paper, as well as the strength of abrasive grains and the water resistance coefficient are indicated in the Appendix.

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. On the non-working surface of the roll the following must be clearly marked no more than every 150 mm in the transverse and longitudinal directions:

b) symbol of the sanding paper (without designations of type, type, size);

c) batch number.

Notes.

1. (Deleted, Amendment No. 1).

2. On a two-layer sandpaper, the grain size of the bottom layer should be indicated. For example, when making a two-layer skin with a grain size of 40-N/25-P, the grain size of the bottom layer is indicated as 40-N.

(Changed edition, Rev. No. 1, ).

5.2. Winding the sanding paper into rolls should be tight and even, preventing the formation of wrinkles, folds and crumpled areas.

The end surface must be smooth, the projections of the edges must not exceed 20 mm. When installing the roll at the end, the protruding edges should not be wrinkled by more than 7 mm.

5.4. The packaged roll must be labeled or stamped with clearly marked information:

a) trademark of the manufacturer;

b) symbol of the sanding paper;

c) release date and batch number;

d) technical control stamp.

Note: A roll of sanding paper made using YAN-153 varnish or similar materials must be affixed with a label indicating storage and transportation conditions.

Section 6. (Excluded, Change No. 3).

ANNEX 1
Mandatory

METHOD FOR DETERMINING CUTTING ABILITY,
INDICATORS OF STRENGTH OF FIXING ABRASIVE GRAINS
AND WATER RESISTANCE RATIO

1. Equipment and materials

1.1. Device for testing PSSh-3.

1.2. Technical scales with a weighing error of no more than 0.01 g.

1.3. Samples of sanding paper 680 mm long and 20 mm wide.

1.4. Rod made of calibrated steel grade 45 GOST 1051 with a diameter of 10 mm and a length of 250 - 300 mm.

(Changed edition, Rev. No. 1).

2. Preparation for the test

2.1. Edge and weigh a sample of abrasive paper.

2.2. Attach a sample of sanding paper to a metal disk with a diameter of 100 mm and the sanding rod in the chuck holder.

The grinding rod must be inclined in the opposite direction of the rotation of the disk so that the end of the rod is flat after grinding. For this purpose, grinding is carried out with 12-grain sandpaper from normal electrocorundum for 15 s at a radial load of 19.6 N, a rod rotation speed of 36 min -1, and a grinding speed of 15 m/s.

2.1, 2.2. (Changed edition, Amendment No. 1).

3. Carrying out the test

3.1. Set the test modes indicated in the table.

Grain	Grinding speed, m/s	Rod rotation frequency, min -1	Duration of the grinding cycle, s	Durability criterion - minimum metal removal per cycle, mm
4; 5; M63; M50; M40			19,6
6; 8			29,4
10 - 16			39,2		0.5 (Changed edition, Amendment No. 1). 3.6. Remove and weigh a sample of abrasive paper. (Introduced additionally, Rev.№ 1). 4. Processing of test results 4.1. Cutting abilityQ,mm 3 /min, determined by the formula Where q 1 - length of the ground reference rod for the 1st grinding cycle, mm; t-duration of the grinding cycle, s. 4.2. Indicator of the strength of fixation of abrasive grains of sandpaperK, mm/g, determined by the formula Where q 1 - length of ground reference rod, mm; n- number of cycles until the durability criterion is achieved; Δ is the difference in mass of the sanding paper sample before and after testing, g. 4.3. The cutting ability and index of fastening strength of abrasive grains are determined as the arithmetic average of three tests. 4.1 - 4.3. (Changed edition, Rev. No. 1). 4.4. The water resistance coefficient is determined by testing a dry sandpaper sample and a sandpaper sample kept in water at a temperature of (60 ± 3) °C for 2 hours. (Introduced additionally, Amendment No. 1). APPENDIX 2 Information INDICATORS OF STRENGTH OF FIXING ABRASIVE GRAINS AND WATER RESISTANCE COEFFICIENT OF SANDING PADS 1. Indicators of the strength of fastening of the abrasive grains of the sanding paper (the ratio of the removed material of the reference rod to the mass of the working layer destroyed to the base) must correspond to the values indicated in the table. 3,3 - 15,0
20; 25; 32; 40; 50			0,8 - 2,1	2,1 - 14,0
Silicon carbide			4; 5; M63; M50; M40	1,8 - 11,0		11,0 - 53,0
	6; 8	1,6 - 5,7	5,7 - 28,0
	10; 12; 16; 20; 25; 32	0,2 - 2,7	2,7 - 14,0
	40; 50	0,3 - 1,1	1,1 - 11,0
	40/25		0,5 - 5,0

(Changed edition, Change No. 3).

2. (Excluded, Change No. 3).

INFORMATION DATA

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

2. APPROVED AND ENTERED INTO EFFECT by the Resolution State Committee USSR according to standards dated September 13, 1979 No. 3555

3. INSTEAD GOST 13344-67

4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

5. The validity period was lifted according to Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)

6. EDITION (July 2003) with Amendments No. 1, 2, 3, approved in February 1983, June 1985, July 1989 (IUS 6-83, 9-85, 11-89)

STATE STANDARD

USSR UNION

TECHNICAL CONDITIONS

GOST 13344-79

Official publication

IPC PUBLISHING HOUSE OF STANDARDS Moscow

UDC 621.921.6.024:006.354 Group G25

STATE STANDARD OF THE USSR UNION

WATER-RESISTANT FABRIC SANDING PAPER

Specifications

Waterproof abrasive cloth. Specifications

Date of introduction 01/01/81

This standard applies to waterproof cloth abrasive paper intended for abrasive processing of various materials with and without the use of a cutting fluid based on water, oil, kerosene, etc.

1. TYPES AND SIZES

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

1 - for machine and manual processing of wood, plastics, varnish coatings and alloys with low hardness;

2 - for machine and manual processing of hard and highly viscous metals and alloys.

1.2. (Deleted, Amendment No. 1).

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

O - single-layer;

D - two-layer.

1.4. Sanding paper must be produced in rolls, the sizes and grain sizes of which must correspond to those indicated in the table. 1.

Official publication Reproduction prohibited

Table 1

Notes:

1. At the customer’s request, it is allowed to produce rolls with a width of more than 840 mm and a length of more than 30 m.

2. At the customer’s request, it is allowed to produce sanding paper from other grades and grain sizes of abrasive materials or mixtures thereof.

An example of a symbol for a waterproof fabric two-layer sanding paper type 2, 820 mm wide, 20 m long, on a fabric base made of plain-dyed weighted twill, from green silicon carbide grade 63C, grit size 40-N and 25-P, on phenol-formaldehyde resin:

D2 820x20 UG 63S 40-N/25-P SFZHGOST 13344-79

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

2. TECHNICAL REQUIREMENTS

2.2. To make sanding paper, fabrics should be used in accordance with GOST 3357, GOST 19196, special durable twill (SP), medium twill No. 1 plain-dyed (S1G), weighted twill (UG), semi-double-thread plain-dyed (P).

Notes:

1. The use of other fabrics, including synthetic fibers, is allowed.

2. If the fabric does not have an established symbol, it is allowed to indicate the fabric article in the symbol of the skin.

2.3. The grinding material must be firmly bonded to the base with phenol-formaldehyde resin grades SFZh-3038 and SFZh-3039 according to GOST 20907, varnish grade YAN-153 according to normative and technical documentation (NTD).

Note. It is permissible to use other ligaments whose physical and mechanical properties are no worse than those indicated.

Note. At the customer's request, it is allowed to use grinding materials with a main fraction content of 65% or more.

2.5. (Deleted, Amendment No. 3).

2.6. On the working surface of the sanding paper, the total area of wrinkles, folds, areas without abrasive grains, filled with a binder, should not exceed 0.5% of the roll area for grits 25 and 20.

For skins of other grain sizes, the total area of these defects should be no more than 1% of the roll area.

In a roll of skins, edges with a width of more than 10 mm with defects are not allowed.

2.7. (Deleted, Amendment No. 1).

2.8. The uneven thickness of the sanding paper should correspond to the values indicated in the table. 3.

Table 3*

(Changed edition, Amendment No. 1).

2.9. The tensile strength and elongation of the air-dry sandpaper must correspond to the values indicated in the table. 4.

Table 4

Note. Values of breaking load and elongation of tissues not provided for in Table. 4, must be no less than for fabric P.

2.10. Indicators of the strength of fixation of abrasive grains are indicated in Appendix 2.

2.9, 2.10. (Changed edition, Amendment No. 3).

2.11. The cutting ability of the sanding paper under the grinding conditions specified in Appendix 1 must correspond to the values specified in table. 5.

Table 5

Grain	Cutting capacity, mm 3 /min, not less
Grain	silicon carbide	electrocorundum

2.12. The water resistance coefficient (the ratio of the cutting ability of sandpaper soaked in water to the cutting ability of dry sandpaper) must be at least 0.75. 2.11, 2.12. (Introduced additionally, Amendment No. 3).

3. ACCEPTANCE RULES

3 1 To control the compliance of the abrasive paper with the requirements of this standard, acceptance inspection and periodic testing are carried out

(Changed edition, Amendment No. 3).

3 2 Acceptance control for compliance with the requirements of paragraphs 1 4 (in terms of dimensions) and 2 6 must be subject to at least 1% of rolls of abrasive paper from the batch, but not less than 3 pieces, according to paragraphs 2 11 - 0.1%, but not less than 3 PC

The batch must consist of rolls of skins of the same characteristics, produced in one shift and simultaneously presented for acceptance according to one document

3 3 If during acceptance control it is established that there is non-compliance with the requirements of the standard for more than one controlled indicator, then the batch is not accepted

If non-compliance with the requirements of the standard is established for one of the controlled indicators, then re-inspection is carried out on twice the number of rolls of abrasive paper. If there are defects in the re-sampling, the batch is not accepted

(Changed edition, Amendment No. 3).

3 4 Products (one of the roll sizes) that have passed the acceptance control must be subjected to periodic testing for compliance with the requirements of paragraphs 28 and 2 12 of at least 0.5% of the batch of rolls, but not less than 3 pieces, according to paragraph 2 9 - not less than 0 .5% rolls of sandpaper, 40/25 grit; 40; 25; 8; 5 and 4, but not less than 3 pieces, according to paragraph 2 9 - on all types of fabrics

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

3 5 Periodic tests must be carried out at least once a year

(Changed edition, Amendment No. 3).

4. CONTROL AND TEST METHODS

4 1 Test methods - according to GOST 6456

Control of tensile strength and elongation - according to GOST 27181

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

4 2 The method for determining the cutting ability of grinding paper, as well as the strength of abrasive grains and the water resistance coefficient are specified in Appendix 1

5. MARKING, PACKAGING, TRANSPORTATION

AND STORAGE

5.1. On the non-working surface of the roll the following must be clearly marked no more than every 150 mm in the transverse and longitudinal directions:

b) symbol sanding paper (without designation of type, type, size);

c) batch number.

Notes

2.1. (Deleted, Amendment No. 1).

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

5.2. Winding the sanding paper into rolls should be tight and even, preventing the formation of wrinkles, folds and crumpled areas.

The end surface must be smooth, the projections of the edges must not exceed 20 mm. When installing the roll at the end, the protruding edges should not be wrinkled by more than 7 mm.

5.3. Rolls of sanding paper must be wrapped in paper in accordance with GOST 8273 and GOST 2228 or other packaging materials. Layers of packaging paper must reliably cover the ends of the rolls and ensure the preservation of the rolls of skins during transportation.

(Changed edition, Amendment No. 3).

5.4. The packaged roll must be labeled or stamped with clearly marked information:

a) trademark of the manufacturer;

b) symbol of the sanding paper;

c) release date and batch number;

d) technical control stamp.

Note. A roll of sanding paper made using YAN-153 varnish or similar materials must be affixed with a label indicating storage and transportation conditions.

5.5-5.11. (Excluded, Amendment No. 3).

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

(Introduced additionally, Amendment No. 3).

Section 6. (Deleted, Amendment No. 3).

APPENDIX 1 Mandatory

METHOD FOR DETERMINING CUTTING ABILITY, INDICATORS OF STRENGTH OF ABRASIVE GRAINS AND WATER RESISTANCE COEFFICIENT 1 2 3

1. Equipment and materials

1.1. Device for testing PSSh-3.

1.2. Technical scales with a weighing error of no more than 0.01 g.

1.3. Samples of sanding paper 680 mm long and 20 mm wide.

1.4. A rod made of calibrated steel grade 45 according to GOST 1051 with a diameter of 10 mm and a length of 250-300 mm.

(Changed edition, Amendment No. 1).

2. Preparation for the test

2.1. Edge and weigh a sample of abrasive paper.

2.2. Attach a sample of sanding paper to a metal disk with a diameter of 100 mm and the sanding rod in the chuck holder.

2.1, 2.2. (Changed edition, Amendment No. 1).

3. Carrying out the test

3.1. Set the test modes indicated in the table.

(Changed edition, Amendment No. 3).

3.2. Perform grinding.

3.3. Measure the length of the ground section of the rod with a caliper with an error of 0.05 mm.

3.4. Cool the rod to room temperature or replace it with another one.

3.5. Repeat operations according to paragraphs. 3.2-3.4 until the durability criterion of the abrasive paper is reached in accordance with the table.

3.2-3.5. (Changed edition, Amendment No. I).

3.6. Remove and weigh a sample of abrasive paper.

4. Processing of test results

4.1. Cutting ability Q, mm 3 /min, is determined by the formula

Q --- ,

where q x is the length of the ground reference rod per 1st cycle grinding, mm;

D - duration of the grinding cycle, s.

4.2. The indicator of the strength of fixation of abrasive grains of sandpaper /G, mm/g, is determined by the formula

length of ground reference rod, mm; number of cycles until durability criterion is achieved; difference in mass of the sanding paper sample before and after testing, g.

where q x - n - D-

4.3. The cutting ability and index of fastening strength of abrasive grains are determined as the arithmetic average of three tests.

4.1-4.3. (Changed edition, Amendment No. 1).

4.4. The water resistance coefficient is determined by testing a dry sandpaper sample and a sandpaper sample kept in water at a temperature of (60±3) C for 2 hours.

(Introduced additionally, Amendment No. 1).

APPENDIX 2 Information

INDICATORS OF STRENGTH OF FIXING ABRASIVE GRAINS AND WATER RESISTANCE COEFFICIENT OF GRINDING FELLET

1. Indicators of the strength of fastening of the abrasive grains of the sanding paper (the ratio of the removed material of the reference rod to the mass of the working layer destroyed to the base) must correspond to the values indicated in the table.

grinding material	Grain	Strength indicator K, mm/g, for sandpaper types
grinding material	Grain
Electrocorundum	4; 5; M63; M50; M40


	20; 25; 32; 40; 50
Silicon carbide	4; 5; M63; M50; M40

	10; 12; 16; 20; 25; 32

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

INFORMATION DATA

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

DEVELOPERS

L.A. Grechko, V.I. Dombrovsky, M.A. Zaitseva, L.A. Kogan, V.S. Kravchenko, T.A. Krivtsova, A.A. Dustier, E.S. Plotkina, V.A. Rybakov, S.K! Rozin

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated September 13, 1979 No. 3555

3. The date of the first inspection is 1989, the frequency of inspection is 5 years.

4. INSTEAD GOST 13344-67

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

6. The validity period was lifted according to the protocol of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)

7. REISSUE (April 1997) with Amendments No. 1,2,3, approved in February 1983, June 1985, July 1989 (IUS 6-83, 9-85, 11-89)

Editor V. L. Ogurtsov Technical editor V,I. Prusakova Corrector M.S. Kabashova Computer layout L.A. Circular

Ed. persons N° 021007 from J0.08.95. Delivered to set 05.14.97. Signed for publication on June 10, 1997. Uel. oven l. 0.70. Academic ed. l. 0.60. Circulation 200 copies. C576. Zach. 414.

IPK Standards Publishing House, 107076, Moscow, Kolodezny per., 14. Typed at the Publishing House on a PC

Branch of IPK Standards Publishing House - type. th Moscow Printer”

Moscow, Lyalin lane, 6.