This invention relates to a process for the production of a polyurethane elastomer by reacting a reaction mixture comprising (A) an isocyanate-reactive component having a molecular weight of 400 to 12,000, a functionality of about 2 to about 8 and being capped with 13 to 21% by weight of ethylene oxide, wherein the isocyanate-reactive groups are hydroxyl groups, amine groups or mixtures thereof; (B) an isocyanate-reactive component comprising (1) an isocyanate-reactive component containing at least two hydroxyl groups and having a molecular weight of from 62 to 399, and (2) an isocyanate-reactive component selected from the group consisting of (a) an isocyanate-reactive group containing tertiary amine polyether corresponding to a specific formula, (b) at least one organic amine compound containing at least two amine groups which are reactive with isocyanate groups; (C) potassium halide; (D) an internal mold release agent; (E) at least one catalyst, and (F) a polyisocyanate component.