overview
Common Name: Span 20
CAS Number: 1338-39-2
EINECS Number: 215-663-3
Molecular Formula: C18H34O6
Molecular Weight: 346.46 g/mol
Sorbitan Monolaurate, also known as Span 20, is a nonionic surfactant derived from the esterification of sorbitol with lauric acid.
It is commonly used as a water-in-oil (W/O) emulsifier in food, cosmetics, pharmaceuticals, and industrial applications.
Span 20 offers good emulsifying, dispersing, and wetting properties, making it suitable for formulations requiring stability and mildness.
Molecular structure description
Hydrophilic part: Sorbitan (dehydrated sorbitol) head group
HLB value: ~8.6 (moderately lipophilic, suitable for water-in-oil emulsions)
Specifications
It is a nonionic surfactant composed of a sorbitan ring esterified with lauric acid, forming an amphiphilic molecule that can reduce surface tension and stabilize emulsions.
It is slightly soluble in isopropanol, tetrachloroethylene, xylene, cottonseed oil, and mineral oil; sparingly soluble in liquid paraffin; and insoluble in water.
When dispersed in water, it forms a milky emulsion. Thanks to its unique molecular structure and solubility characteristics, it exhibits multiple functional properties.
| Test Item | Unit | Minimum Value | Maximum Value |
|---|---|---|---|
| Saponification value | mg KOH/g | 155 | 170 |
| Hydroxyl value | mg KOH/g | 330 | 360 |
| Acid value | mg KOH/g | — | 7 |
| Moisture | % | — | 1.5 |
| Fatty acid content | w% | 56 | 68 |
| Polyol content | w% | 36 | 49 |
| Ash residue (on ignition) | w% | — | 0.5 |
| Sulfur (S) | mg/kg | — | 3 |
| Lead (Pb) | mg/kg | — | 2 |
Applications
It works well in water-in-oil emulsions and provides excellent compatibility with other nonionic surfactants.
Its mild nature and versatility make it a preferred ingredient in formulations requiring stability and safety.
Emulsification Efficiency – Stable W/O Emulsions
Sorbitan esters are highly effective in forming stable water-in-oil emulsions. Ideal for margarine, creams, and ointments, they help maintain consistency and prevent separation over time.
Mild & Skin-Friendly – Ideal for Cosmetics
Widely used in lotions, creams, and makeup products, sorbitan esters are non-irritating and suitable for sensitive skin. They provide smooth textures and enhance product stability.
Food Grade & Safe – Emulsifiers for Processing
Approved for food use, they act as emulsifiers in sauces, dairy products, and spreads. Improve mouthfeel, extend shelf life, and maintain homogeneity of processed foods.
Pharmaceutical Use – Enhances Drug Stability
Used in medicinal creams, gels, and suspensions, sorbitan esters help deliver oil-soluble actives effectively. They improve bioavailability and ensure long-term formulation stability.
storage & package
Storage:
Store in a cool, dry, and well-ventilated area, away from direct sunlight and sources of heat.
Avoid contact with harmful or incompatible substances. Handle with care during transportation to prevent leakage or contamination.
Transportation:
Transport as a general chemical product, following standard safety and handling procedures.
Package:
Sorbitan Monolaurate is packed in high-quality PE drums with double-seal lids.
Standard packaging sizes include 25kg/drum, 200kg/drum, and 1000kg IBC tote to meet different usage needs.
25 Kg /drum
200kg/drum
