A masterbatch for a rubber formulation consists of a mixture of rubber and one or more additives, such as rubber chemicals or carbon black, Insoluble Sulfur, present in high concentrations. We usually use EPDM 20% + our range of rubber chemicals 80%, but can also be used SBR/NBR/EPDM in percentage range 25 – 15 %. Formulation can be developed based on customer request.