Overview
Sorbitan Monostearate (Span 60) is a waxy, nonionic surfactant synthesized by esterifying sorbitol with stearic acid. It belongs to the Span series of emulsifiers and is valued for its ability to stabilize water-in-oil emulsions. The compound is biodegradable and widely compliant with international standards for food (E491), cosmetics, and pharmaceuticals. In industrial contexts, surplus or reclaimed Span 60 (referred to as '回收积压司盘' in Chinese) may be available at discounted prices. Buyers should assess shelf life, storage conditions, and batch testing reports to ensure performance matches virgin material specifications.
Physical and Chemical Properties
Span 60 exhibits a mild odor and creamy texture, with a hydrophilic-lipophilic balance (HLB) of 4.7, making it ideal for oil-phase formulations. Its low melting point (50-55°C) allows easy incorporation into hot processes. The compound is chemically stable under normal conditions but may hydrolyze in strong acids or bases. Solubility varies: it disperses well in fats and organic solvents like ethanol but is insoluble in cold water. Its emulsifying performance is temperature-dependent, with optimal activity between 40-70°C. Industrial-grade variants may contain minor impurities like free fatty acids, affecting clarity in solutions.
Main Applications
In food production, Span 60 acts as a dough conditioner, whipped cream stabilizer, and anti-caking agent. It’s listed as E491 in the EU and approved by the FDA. Cosmetic formulations leverage its emollient properties in creams, lotions, and makeup removers. Pharmaceuticals use it as a tablet coating aid or ointment base. Industrially, it serves as a lubricant additive or textile softener. Reclaimed Span 60 is often repurposed for non-critical applications like industrial lubricants or low-cost emulsifiers where premium purity isn’t required.
Safety and Storage
Span 60 is classified as low-toxicity (LD50 >10g/kg orally in rats) but may cause mild eye/skin irritation. Dust inhalation should be avoided—use PPE during handling. Store in sealed containers away from oxidizers and moisture to prevent clumping. Reclaimed batches require extra vigilance: test for oxidation (peroxide value) and microbial contamination. For food/pharma use, ensure compliance with current Good Manufacturing Practices (cGMP) and obtain Certificates of Analysis (CoA) for each lot.
B2B Procurement Guide
When sourcing surplus Span 60, prioritize suppliers who provide batch-specific data on residual solvents, acidity, and moisture content. Food-grade material should meet FCC or USP standards; industrial-grade may tolerate higher impurity levels. Negotiate pricing based on remaining shelf life (typically 2 years from production). Bulk purchases (1+ metric tons) often secure 10-20% discounts. For blended or reprocessed stocks, request performance testing in your specific application (e.g., emulsion stability assays).
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