Surfactants
REACH
Sorbitan monostearate
CAS Number
1338-41-6
EC Number
215-664-9
E Number
E491
FEMA Number
FEMA 3028
Abbreviation
SMS
What is Sorbitan monostearate?
Sorbitan monostearate (CAS 1338-41-6), commonly known as SMS or E491, is a non-ionic emulsifier derived from sorbitol and stearic acid. Also marketed as Arlacel 60.
Where is Sorbitan monostearate used?
- Food: stabilizer of fat-based emulsions in baked goods and confectionery coatings, controlling fat crystallization and texture in margarine
- Cosmetics and personal care: water-in-oil emulsifier in creams and lotions, providing structure and spreadability
- Pharmaceuticals: excipient in topical ointments and tablet coatings, supporting uniform active ingredient distribution
- Textile processing: fiber lubricant and softening agent that reduces friction during yarn and fabric production.
Commercial specifications
- Food-grade material meets FCC and E491 specifications
- Pharmaceutical-grade supply conforms to USP and Ph. Eur. standards
Other Names (Synonyms)
Arlacel 60|Sorbitan monooctadecanoate|Sorgen 50|Sorbitan stearate|Stearate de sorbitan|Lipsorb s|Liposorb S|Stearic acid, monoester with sorbitan|SMS|E491
What are the physical properties of Sorbitan monostearate?
Melting Point 49-65 °C
Boiling Point 464.84°C (rough estimate)
Density 1.0 g/cm³ @ Temp: 25 °C
Flash Point >230 °F
Appearance Liquid
Color Cream coloured flakes
Odor Slight
Form Solid
Water Solubility Soluble in ethanol (50 mg/ml), isopropanol, mineral oil and vegetable oil. Insoluble in water.
Vapor Pressure <1.4 hPa (20 °C)
Refractive Index 1.4593 (estimate)
Log P 7.66
Which trade and regulatory codes apply to Sorbitan monostearate?
HS Code 34021300
Storage Class 11 - Combustible Solids
WGK (Germany) 1