Sandpaper

Usually made of paper or cloth, it is used for sanding the substrate to be coated or to sand the previously applied coats. This type of paper has a part uniformly sprinkled with grains of different sizes whose units of measure are the meshes contained in a square inch (6.45 sq/cm) of the sieve, through which the abrasive grains of the paper have passed. The following table shows the most common grain sizes used:
– 40 – 60 – 80 extra coarse
– 100 – 120 – 150 coarse
– 180 – 200 – 240 medium
– 280 – 320 – 360 fine
– 400 – 500 – 600 very fine
– 700 – 800 – 900 ultrafine