The core active ingredient of Span S-80 (Guoli Chemical product code: S-80 emulsifier, CAS number: 1338-43-8) is sorbitan monooleate. Its molecular formula is C24H44O6, with a molecular weight of 428.61. The product has an effective active ingredient content of no less than 98%, appears as an amber to brown viscous liquid at room temperature. According to our company's product quality standards, the monoester content is ≥80%, which is the main structure for emulsification function; diester and polyester content is controlled at ≤15%, and the residue of free sorbitan and other substances is ≤1.0%.
From a chemical structure perspective, the sorbitan monooleate molecule contains both a lipophilic fatty acid long chain (derived from oleic acid) and hydrophilic hydroxyl and ether bonds (derived from the dehydration cyclization of sorbitan), giving it unique surface activity. The HLB value is approximately 4.3, making it a typical oil-soluble, low-hydrophilic-lipophilic balance emulsifier. It forms a stable interfacial film at the oil-water interface and is specifically used to prepare water-in-oil (W/O) type emulsions. The product is soluble in mineral oil, vegetable oil, and most organic solvents, but insoluble in water.
| Parameter | Value/Description |
|---|---|
| Chemical Name | Sorbitan Monooleate |
| CAS Number | 1338-43-8 |
| Molecular Formula | C24H44O6 |
| Molecular Weight | 428.61 |
| Active Content | ≥98% |
| Monoester Content | ≥80% (main functional component) |
| Diester & Polyester | ≤15% |
| Free Alcohol | ≤1.0% |
| HLB Value | 4.3 |
| Acid Value | ≤10 mg KOH/g |
| Saponification Value | 145~160 mg KOH/g |
| Hydroxyl Value | 200~240 mg KOH/g |
| Iodine Value | 65~85 g I₂/100g |
| Moisture | ≤1.5% |
| Appearance | Amber to brown viscous liquid |
Sorbitan monooleate, as the most representative water-in-oil emulsifier in the Span series, is widely used in cosmetic creams/lotions, food emulsified fats, pesticide emulsifiable concentrates, pharmaceutical ointment bases, and industrial lubricating oils. The recommended dosage in formulations is typically 2% to 5% of the oil phase total. When used in combination with Tween series (e.g., Tween-80), a broader emulsification range and improved emulsion stability can be achieved. This product complies with the food additive standard E494 and can be used in food processing such as baked goods fats and non-dairy creamer.
The sorbitan monooleate molecule contains ester bonds that may hydrolyze under strong acidic or alkaline conditions; therefore, long-term compatibility with strong acids or bases should be avoided. It may cause skin and eye irritation (H315/H319), so it is recommended to wear protective gloves and goggles. The flash point of the product is above 149°C, but it should still be kept away from open flames. Storage temperature should be below 40°C, with the container kept tightly sealed and protected from moisture.