Salt Saliva Metal

Sandpaper and glass paper are names used for a type of coated abrasive that consists of sheets of paper or cloth with abrasive material glued to one face.

There are many varieties of sandpaper, with variations in the paper or backing, the material used for the grit, grit size, and the bond.

In the modern manufacture of these products, sand and glass have been replaced by other abrasives such as aluminium oxide or silicon carbide. It is common to use the name of the abrasive when describing the paper, e.g. "aluminium oxide paper", or "silicon carbide paper" (source Wikipedia).