Dubai paraffinic rubber process oil (rpo)/furfural extract This class of hydrocarbons constitutes branched chain or straight linked hydrocarbon molecules of various viscosities. As the chain length increases, the viscosity increases and the furfural extract rpo becomes more viscous. They find extensive usage in EPDM, Butyl rubbers.include Paraffinic oils with high viscosity and high flash point is good for shelf life of the end product. The high viscosity and high flash point paraffinic oils are extensively used in EPDM profiles for automotive applications.