Span S-60 (Span 60) is a classic nonionic surfactant produced by Haian Guoli Chemical Co., Ltd., with CAS number 1338-41-6, molecular formula C₂₄H₄₆O₆, and molecular weight 430.61. The product appears as a white to light yellow waxy solid, exhibiting excellent water-in-oil (W/O) emulsifying ability, with an HLB value of 4.7, making it a lipophilic emulsifier. It maintains stable performance over a wide pH range and under hard water conditions, and can be flexibly compounded with hydrophilic surfactants such as Tween series to achieve precise design of emulsification systems.
This product has high purity, with an active content ≥98%, solid content ≥99%, and monoester content ≥80%, all key indicators reaching industry-leading levels. It is soluble in hot oils and organic solvents, non-flammable under normal use conditions (flash point >149°C), and has an acute oral LD₅₀ > 15,000 mg/kg, classifying it as a low-toxicity substance. It is widely used in food, cosmetics, pharmaceuticals, and industrial fields.
The following is a complete list of physicochemical technical parameters compiled from the Guoli Chemical product database. The data are authentic and reliable, serving as a reference for formulation design, quality control, and procurement selection.
| Parameter Item | Specification Value | Remarks |
|---|---|---|
| Chemical Name | Sorbitan Monostearate | Systematic name |
| CAS Number | 1338-41-6 | Unique chemical substance identifier |
| Molecular Formula | C₂₄H₄₆O₆ | — |
| Molecular Weight | 430.61 | — |
| Appearance | White to light yellow waxy solid | Solid at room temperature |
| Ionic Type | Nonionic | Unaffected by hard water and electrolytes |
| HLB Value | 4.7 | Lipophilic, suitable for W/O emulsification |
| Active Content | ≥98% | High purity product |
| Solid Content | ≥99% | — |
| Melting Point | 52~57°C | Melting range of waxy solid |
| Density | Approx. 1.0 g/cm³ | Approximate value |
| Flash Point (Closed Cup) | >149°C | Non-flammable under normal use conditions |
| Solubility | Soluble in hot oils and organic solvents | Insoluble in cold water |
| pH Value (5% Aqueous Dispersion) | 5.0~7.0 | Nearly neutral |
| Water Content | ≤1.5% | Low moisture content |
| Acid Value | ≤10 mg KOH/g | Free fatty acid control indicator |
| Saponification Value | 145~160 mg KOH/g | Characterization of ester bond content |
| Hydroxyl Value | 230~270 mg KOH/g | Characterization of hydroxyl content |
| Iodine Value | ≤2 g I₂/100g | Very low unsaturation |
| Monoester Content | ≥80% | Main active component |
| Diester Content | ≤20% | — |
| Free Alcohol | ≤1% | Residual sorbitol/sorbitan |
| Heavy Metals (as Pb) | ≤10 mg/kg | Meets food grade requirements |
| Arsenic (As) | ≤3 mg/kg | Meets food grade requirements |
| Foaming Property |