In colloquial speech, sanding paper is often called “sandpaper” or “sandpaper”.
It consists of a paper or fabric base coated with a layer of abrasive material.
In the production associated with the processing of wood, plastic, metal, glass can not do without sandpaper. It is indispensable when removing old paint, there is no alternative to it if you need to prepare the surface for priming and painting, etc.
The ancient Chinese in the 13th century, using a starch-based adhesive, pasted plant seeds, finely ground sand and shells onto parchment.
“Glass paper” is considered to be the prototype of sanding paper. for its manufacture used the smallest particles of glass.
In 1834, American engineer A. Fisher Jr. first patented the production of sandpaper, where the abrasive grain was silicon carbide and corundum.
You should know that the grain size of sandpaper is one of its main characteristics.
Conventionally, paper was divided into groups: coarse-grained, medium-grained and fine grain paper.
The grain size determines the type of work for which emery paper is intended. Marking will help her choose.
Emery carry out work on dry and wet processing of all kinds of putty surfaces.
For various types of work , sandpaper differing in grain and base is used. The marking of such paper is specific.
Sanding grain
| Old GOST | New GOST |
| M40 ("null") | P400 |
| M-50 | P320 |
| 5-h | P240 |
| 8-h | P180 |
| 10-h | P150 |
| 12-h | P120 |
| 16-h | P100 |
| 20-h | P80 |
| 32-h | P50 |
| 50-h | P36 |
| 63-N | P30 |
| 80-h | P24 |
| 100-N | P20 |
N - labeling of domestic products (old).
P - labeling of imported products and new labeling of domestic products.
Manufacturers that export products use the single global standard for grain size designation.
In some states of the collapsed Union, sandpaper, marking of finished products of sandpaper are carried out in accordance with GOST (old).
The same thing happens in Canada, China, the USA and Japan, where the domestic market uses its own designations.
The European standard (new GOST) implies an increase in values as grain size decreases. Sandpaper is marked completely differently in the above countries.
GOST, for example, is designed in such a way that here the values, on the contrary, decrease as the grain size decreases.
These differences cannot be ignored when purchasing abrasive products in the countries of the former Union, as this difference may lead to the purchase of the wrong product.
Note that imported paper is most often sold in products, while domestic paper is sold in rolls, and it is sold in linear meters.
If paper is used in everyday life, remembering the marking is not necessary. You just need to know that the old marking comes with the letter H after the number, and the new one with the letter P in front of the number.
There are other signs on the back of the paper. Using them, you can establish additional information about sandpaper: its basis, production technology , type of abrasive, grain material, type of binder, etc.
Now you know what sandpaper is. Marking? You figured it out too. It remains to wish everyone a pleasant and fruitful work.