GP 21R-PH Emulsion is a non-fugitive, primarily non-ionic emulsion containing dimethyl silicone fluid. It is an effective and widely used release agent for rubber. This emulsion forms a thin but highly effective parting film. It does not carbonise or gum up, even at temperatures that would rapidly degrade organic mould release agents. Additionally, it does not build up on moulds and does not discolour or damage rubber or plastics.