Sorbitan sesquioleate

Sorbitan sesquioleate (CAS 8007-43-0) is a non-ionic surfactant derived from sorbitol and oleic acid, commercially available under trade names including Span 83, Crill 16, Crill K16, and Sorgen 30. It carries no E-code designation and is identified by the abbreviations SO15 and SSO in formulation contexts.

In water-in-oil emulsion systems, sorbitan sesquioleate acts as a lipophilic emulsifier with an HLB value of approximately 3.7, stabilising the dispersed aqueous phase within oil-continuous matrices. It is used in cosmetic creams and ointments to control droplet size and improve texture, and in pharmaceutical topical formulations where consistent emulsion stability is required across temperature cycles.

Sorbitan sesquioleate is supplied as a viscous liquid and is available in cosmetic, food-contact, and pharmaceutical grades compliant with relevant REACH registration requirements. Buyers should confirm grade-specific compliance with Ph.Eur. or FCC standards depending on application. Standard packaging includes drums and IBCs for bulk procurement.