Castor oil

Castor oil (CAS 8001-79-4), also known as ricini oleum and E1503, is a vegetable-derived triglyceride oil pressed from the seeds of Ricinus communis.

Where is Castor oil used?

• Coatings, adhesives and sealants: plasticizer and flexibilizing agent improving elongation and adhesion in polyurethane and alkyd systems
• Lubricants: base fluid or additive in metalworking fluids, greases and hydraulic systems
• Plastics and polymer processing: softener and processing aid in PVC compounds and nylon 11 production
• Personal care: lip products, hair conditioners and emollient formulations
• Its high hydroxyl content makes it a raw material for polymer chemistry.
• Pharmaceutical industry: carrier and active component in various medical formulations.
• Soap making: provides a rich and creamy lather.
• Castor oil-based surfactants are used in fertigation to facilitate nutrient absorption by plant leaves.

Good to know: Unlike most vegetable oils, it functions as both a reactive intermediate and a functional additive.

Formulation notes

• For cosmetic and personal care, cold-pressed, hexane-free castor oil is recommended for safer use on skin and hair.

Typical specification

• Refined castor oil contains approximately 90% ricinoleic acid, 4% oleic acid and 3% linoleic acid.
• Moisture and volatile matter is maximum 0.25%.
• Free fatty acid content is maximum 1.0%.
• Hydroxyl value is 158-163 mgKOH/g.

Regulatory status

• INCI name is RICINUS COMMUNIS SEED OIL.
• In the food sector, castor oil has limited and controlled use as a food additive.

Storage, packaging and handling

• Supplied in new M.S. drums of 225 kg net weight.
• A 20' FCL container holds 80 drums.

Frequently asked questions about Castor oil

How does the hydroxyl value affect the use of castor oil in polyurethane production?

The hydroxyl value of 158-163 mgKOH/g is a critical parameter determining reactivity in polyurethane production.

What is the role of castor oil in paints and inks?

In paints and inks it is used as a pigment wetting agent and flow regulator.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.