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Castor wax, also called hydrogenated castor oil, is a hard, brittle, vegetable wax. It is produced by the hydrogenation of pure castor oil, in the presence of a nickel catalyst. It is odorless and insoluble in water. It is mainly used for coatings and greases where resistance to moisture, oils and other petrochemical products is required. HCO is available as flakes or powder which melts to a clear transparent liquid. It is a non-toxic, non-hazardous material.