MR 245 Oxidized asphalt Sovereign Chemical Extenders / Fillers >> Asphalts Plasticizers SEALANT Mineral rubber, treated with 1% limestone to prevent re-massing. Used as a plasticizer, process aid and low cost filler in mechanical goods, mats, floor-treads, tire components, retreads, sealing compounds and wire and cable. Can be used at levels up to 50 phr with little effect on physical properties and scorch safety in most compounds. MR 245 is used in compounds with short mix cycles and low mixing temperatures, where a low melt point is required for proper mixing Mineral rubber. Used as a plasticizer, process aid and low cost filler.