In the pulp and paper chemicals production usually starts from cellulose (a polysaccharide mainly from wood), so-called fillers (e.g. kaolin, asbestos, gypsum, barite, titanium dioxide, etc.) and glue substances (resin soaps, fixed with aluminium or chromium sulphate alums), water glass and bone glue. In addition to conventional milling (stone process), there is mainly the pulping process, whereby in extreme heat the wood chips where cooked with the addition of water and then be ground. In pulp production, there are two methods, once the sulphite and the second the sulphate pulp. Sulphite pulp produced by cooking wood chips with calcium or magnesium bisulphite with sulphurous acid, sulphate pulp produced by cooking wood chips in caustic soda with sulphide content. Here come back highly aggressive fluids and extreme heat together, as well as in the processing of pulp and paper, for which PTFE and its refined Fluoropolymers are due to their chemical and physical properties suited.