Sandpaper is colloquially referred to as "sandpaper" or "sandpaper".
It consists of a paper or fabric base coated with an abrasive material.
In production related to the processing of wood, plastic, metal, glass, sandpaper is indispensable. 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 used a starch-based adhesive to stick plant seeds, finely ground sand and shells onto parchment.
Glass paper is considered to be the prototype of sanding paper. the smallest particles of glass were used to make it.
In 1834, American engineer A. Fisher Jr. first patented the production of emery cloth, where silicon carbide and corundum were already abrasive grains.
You should know that the grit of sandpaper is one of its main characteristics.
Conventionally, the paper was divided into groups: coarse-grained,medium and fine grain papers.
The grain size determines the type of work for which sandpaper is intended. Marking will help you choose it.
Emery carry out work on dry and wet processing of various puttied surfaces.
For different types of work, different grain and base sandpaper is used. The marking of such paper is specific.
Sandpaper grit
| Old GOST | New GOST |
| M40("zero") | 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 |
Н - marking of domestic products (old).
P - labeling of imported products and new labeling of domestic products.
Producers producing products for export use a single global standard for designating grain size.
In some states of the collapsed Union, sandpaper, marking of finished products of emery production are carried out according to GOST (old).
The same thing happens inCanada, China, USA and Japan, where the domestic market uses its own designations.
European standard (new GOST) implies an increase in values as grain size decreases. Sandpaper is marked 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 buying abrasive products in the territory of the countries of the former Soviet Union, because this difference may result in the wrong item being purchased.
Note that imported paper is most often sold in products, while domestic paper is sold in rolls and sold by the meter.
If the paper is used in everyday life, then it is not necessary to remember the marking. 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 before the number.
There are other markings 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 got it right with her too. It remains to wish everyone a pleasant and fruitful work.
