Disc materials  --  The main materials used to produce LP records are a vinyl copolymer, a stabilizer, a lubricant, and a pigment, usually carbon black. The latter produces the traditional black color, but other colors including white have been used. These are compounded and extruded or fed into the press in the form of small cakes. Disc material is subject to two types of deformation during playing: elastic, from which it returns, hence is temporary; and plastic, which is permanent, in case of records it is termed "wear".