Sorbitan Fatty Acid Esters CAS#1338-41-6
Sorbitan fatty acid esters, commonly referred to as Span, are a significant class of nonionic surfactants. They are available in various physical forms, including white to yellowish-brown liquids, powders, thin sheets, granules, or waxy blocks. Their properties can vary depending on the specific fatty acids used in their composition.
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Span 60 Chemical Properties
| Melting point | 54-57 °C(lit.) |
| Boiling point | 464.84°C (rough estimate) |
| density | 1 |
| vapor pressure | <1.4 hPa (20 °C) |
| FEMA | 3028 | SORBITAN MONOSTEARATE |
| refractive index | 1.4593 (estimate) |
| Fp | >230 °F |
| storage temp. | Store below +30°C. |
| solubility | Practically insoluble, but dispersible in water, slightly soluble in alcohol. |
| form | Solid |
| pka | 13.63[at 20 ℃] |
| color | Cream coloured flakes |
| Odor | Slight |
| Odor Type | bland |
| Water Solubility | Soluble in ethanol (50 mg/ml), isopropanol, mineral oil and vegetable oil. Insoluble in water. |
| Merck | 148724 |
| BRN | 6820761 |
| Hydrophilic-Lipophilic Balance (HLB) | 4.7 |
| Exposure limits | ACGIH: TWA 10 mg/m3; TWA 3 mg/m3 |
| Stability: | Stable. Combustible. Incompatible with strong oxidizing agents. |
| InChIKey | HVUMOYIDDBPOLL-XGKPLOKHSA-N |
| LogP | 7.66 |
| CAS DataBase Reference | 1338-41-6(CAS DataBase Reference) |
| EPA Substance Registry System | Sorbitan monostearate (1338-41-6) |
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Product Usage
Sorbitan fatty acid esters (trade name "Span"), as nonionic surfactants, are widely valued for their excellent emulsifying, dispersing, stabilizing, and solubilizing properties. In the pharmaceutical industry, they are used as excipients in formulations such as ointments and oral emulsions. In the industrial sector, they enhance textile processing performance and improve the final quality of products. Different applications require corresponding grades—food, pharmaceutical, or industrial—to ensure safety and suitability.
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