Span S-20 (sorbitan monolaurate) is a nonionic surfactant refined through esterification. From a toxicological perspective, this product is classified as low-toxicity and is used in the food, pharmaceutical, and cosmetic industries, meeting relevant excipient standards, indicating that its safety is recognized under limited usage conditions. However, this does not mean that its potential health risks can be ignored.
This product is classified as an irritant (Xi), irritating to skin, eyes, and respiratory system (R36\/37\/38). Short-term exposure may cause local redness and discomfort; prolonged or repeated exposure may also cause skin defatting and dryness. Therefore, during actual operations, wearing chemical safety goggles, nitrile or neoprene gloves, and long-sleeved work clothes is necessary protective measures. In case of accidental eye contact, immediately flush with plenty of water for at least 15 minutes and seek medical attention.
Regarding environmental impact, the molecular structure of Span S-20 is based on natural fatty acids (lauric acid) and sorbitan, providing good biodegradability and low persistence in the environment. However, as a surfactant, if a large amount leaks into water bodies, it may still have adverse effects on aquatic organisms by reducing surface tension. Therefore, spills should be collected using inert absorbent materials and not be discharged into sewers or water bodies; waste should be disposed of in compliance with local regulations as non-hazardous industrial waste.
| Parameter | Description |
|---|---|
| Chemical Name | Sorbitan monolaurate |
| CAS Number | 1338-39-2 |
| Product Type | Nonionic surfactant |
| Hazard Symbol | Xi (Irritant) |
| R Phrases | R36\/37\/38 — Irritating to eyes, respiratory system, and skin |
| Biodegradability | Good biodegradability (no specific degradation rate data available at present) |
| Dangerous Goods Classification | Not classified as dangerous goods under current regulations |
| Storage Temperature | Recommended 5°C to 35°C |
| Storage Period | Should not exceed 24 months from date of manufacture |
Given the low toxicity of Span S-20, it is widely used in the food industry (baking fats, powdered cream, chocolate coatings), pharmaceutical preparations (topical creams, ointment bases), and cosmetics (creams, lotions). In compounding formulations, the recommended dosage should be determined based on specific process requirements. When used as a W\/O emulsifier, it is typically combined with hydrophilic emulsifiers (such as Tween series), and optimal emulsification can be achieved by adjusting the HLB value.