Oxidized castor oil

Oxidized castor oil (CAS 68187-84-8), also known commercially as CasChem 40 Oil, is a chemically modified vegetable oil produced by controlled oxidation of natural castor oil. The oxidation process introduces functional crosslinks that build viscosity and improve compatibility with resins, making it a functional additive for rheology control and plasticization.

In coatings and printing inks, it acts as a bodying agent and flow modifier, improving film build and reducing sagging without compromising pigment dispersion in the final product. Adhesive and sealant formulators incorporate it to adjust tack, flexibility, and substrate wetting in solvent-based and reactive systems to ensure high performance and durability.

As a plasticizer in PVC and rubber compounding, it contributes softness and processing aid properties while offering bio-based content for environmentally conscious industrial applications. In metalworking fluids and industrial lubricants, it functions as a base component or additive where high-viscosity, bio-derived oils are preferred over petroleum alternatives.

Oxidized castor oil is supplied as a viscous amber liquid, with viscosity grade being the primary specification differentiator across various commercial offerings for industrial use. It is available in technical grade, with product performance typically characterized by viscosity, acid value, and hydroxyl value rather than specific pharmacopeial standards.