active fillers which result in a decisive improvement of the mechanical properties particularly of the tensile strength and the abrasion resistance such as types of active black carbon aluminium and calcium silicate and zinc oxide or 2 2 inactive fillers which do not result in a quantitative improvement of the vulcanized goods for example calcium and magnesium carbonate kaolin barite kieselguhr and various clays 2 3 for elastomers which are not filled with carbon black dyes namely 2 3 1 inorganic pigments for example lithopone titanium dioxide iron oxide and chrome oxide green or 3 plasticizers for improving the processing properties the elasticity and the cold behavior namely 3 1 for non polar or weakly polar crude rubber types for example natural rubber nr styrene butadiene copolymers sbr polybutadiene br isobutylene isoprene copolymers iir mineral oil products 3 2 for more polar types for example acrylonitrilebutadiene copolymer nbr and polychlorobutadiene cr phthalates for example dibutyl and dioctylphthalate phosphoric esters for example tricresyl phosphate and aromatic mineral oils 3 3 further processing adjuvants for example factices i e vegetable oils treated with sulfur or sulfur chloride lanoline soft paraffin soft polyethylene bitumen and pitch 4 age protectors for improving the resistance of the finished vulcanized good against oxygen the.