PC 60 (P-1015) Oxidized castor oil Degen Oils (Process / Natural) >> Castor Oil (Polymerized/Oxidized) Rubber - Elastomer (Chloroprene, Butyl …) ADHESIVE Blown Castor Oils are polymerized by oxidation in order to increase viscosity and specific gravity. Blown Castor is used as a plasticizer in adhesives, rubber. Its hydrophobicity makes Blown Castor an excellent water fighter. Hydrophobic blown castor oil. Used as plasticizer in adhesives.