Marking sandpaper depending on its destination

This abrasive material is a paper or fabric base, which is applied directly to the abrasive material (in powder or "grain").Here is the "grain" and is one of the main characteristics of the product, which is known under different "names": sandpaper, sandpaper.From the grain size depends on what kind of work you can produce this with sandpaper, and this is indicated by the marking.

should know that artificial abrasives (corundum, silicon carbide and others.) Are used in production.All the "family" sandpapers classified according to Russian and foreign standards.Therefore, hereinafter, for simplicity, all indicators will be specified in accordance with the Russian GOST.It corresponds to the foreign FEPA standard, or ISO 6344 as a standard in the world.However, some countries apply and their standards (Canada, USA, China, Japan).Sandpaper is available or single sheets (sheets) or rolls.

Assignment of sandpaper, depending on the labeling

letter "P" in the GOST stands for grain, and is characterized by numbers from 12 to 2500. The higher the number in the notation "nazhdachki", so it is smaller (smaller grain size).However, in some former Soviet republics to refer to grain used even GOST USSR.For example, 20 - N. That is, if the size of tens of micrometers.If just in microns, the symbol will be so - M20.It refers to one of the fine sandpaper, commonly called "nulevkoy".Here is a brief classification of sandpaper.

• For very rough work P22, P24, P36 80-H, 63-H, 50-H
• For rough work P40, P46, P60 40-H, 32-H, 25-H
• For primary grinding P80, P90, P100, P120 20-H, 16-H, 12-H, 10-H
• For final sanding P150, P180 8-H, 6 H

For fine-grained types of sandpaper has its own classification.

• P240 Sanding hardwood P280 5-H, M63
• polishing, grinding
• before painting P400, P600 M28, M40;2-H, 3-H
• Grinding Ceramics,
• plastic, metal P1000 M20, 1-H
• Polishing P1200, P1500, M14, M10, M7, M5
• R2000, R2500 H 0, H-00,H-01

on the reverse side of sandpaper there are other names by which you can determine what is its basis, production technology, type of abrasive material, etc. Here are some examples:..

1. if there is no separate letter,this paper roll.We have an index sheet "L";
2. «1» - is designed for the grinding of soft materials;
3. «2» - grinding of metals;
4. letters L1, L2 and M denote a paper wet;
5. letters P warned that the paper afraid of dampness.

There are a number of signs, but they are interesting only to the expert, but for practical use sandpaper no special role to play.