Sorbitan trioleate, also known as STO, is synthesized by the esterification of sorbitan with oleic acid. It has a molecular formula of C60H108O8. At room temperature, it is in the form of a pale-yellow viscous liquid. It is a W/O emulsifier with an HLB value of 1.8. It is soluble in mineral and vegetable oil. Its functions include emulsification for cosmetics and personal care products; lubrication, dispersant, and softener for textiles; and anti-rusting for oil extraction.

· CAS NO.: 26266-58-0

· MOLECULAR FORMULA: C60H108O8

· MOLECULAR WEIGHT: 957.46

Technical Information of Sorbitan Trioleate

According to Q/GDRH 007-2020, other parameters are available upon request.

Parameters Unit Standard value

Acid value mg KOH/g ≤15.0

Saponification value mg KOH/g 165～180

Hydroxyl value mg KOH/g 60～80

Moisture w/% ≤1.5

Advantages of sorbitan trioleate span 85

Span 85 surfactant is widely used in cosmetic products, personal care products, and industrial products

Can be used in cosmetic, pharmaceutical and industry 

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