Overview
Steareth-2 is a nonionic surfactant derived from stearyl alcohol and ethylene oxide. It belongs to the broader class of steareth compounds, which are widely used in the cosmetics and personal care industry. As a mild emulsifier and solubilizer, it helps blend oil and water phases in formulations. This chemical is particularly valued for its ability to stabilize emulsions without causing significant skin irritation. It's commonly found in products like creams, lotions, and hair care formulations where gentle yet effective performance is required. The '2' in its name refers to the average number of ethylene oxide units in its molecular structure.
Physical and Chemical Properties
Steareth-2 appears as a white to off-white waxy solid at room temperature. Its molecular weight of approximately 358.6 g/mol and solubility profile make it versatile for various formulation needs. The compound melts at around 50-60°C, transitioning to a liquid state suitable for incorporation into cosmetic bases. As a nonionic surfactant, Steareth-2 demonstrates good compatibility with both polar and nonpolar substances. Its hydrophilic-lipophilic balance (HLB) value typically falls in the range of 4-6, making it suitable for water-in-oil emulsions. The chemical is stable under normal storage conditions but should be protected from excessive heat and moisture.
Main Applications
The primary application of Steareth-2 is in the cosmetics and personal care industry, where it serves multiple functions. It acts as an emulsifier in creams and lotions, helping to create stable mixtures of oil and water phases. The compound's mild nature makes it suitable for sensitive skin formulations. Beyond emulsions, Steareth-2 functions as a solubilizer for fragrances and essential oils in aqueous systems. It's also used in hair care products to improve conditioning and combability. In pharmaceutical preparations, it may serve as an excipient for topical drug delivery systems, enhancing the absorption of active ingredients.
Safety and Storage
Steareth-2 is generally recognized as safe for use in cosmetic applications when used as directed. Regulatory bodies including the FDA and European Commission have approved its use in personal care products. However, proper handling procedures should be followed to minimize potential risks. For storage, maintain the product in its original packaging in a cool, dry environment away from direct sunlight. Typical shelf life ranges from 2-3 years when stored properly. While the compound is not classified as hazardous under normal conditions, appropriate personal protective equipment should be worn during industrial handling to prevent potential eye or skin irritation.
B2B Procurement Guide
When sourcing Steareth-2 for industrial or commercial use, several factors should be considered. Verify that the supplier can provide certified cosmetic-grade material meeting relevant purity specifications (typically 98% or higher). Documentation should include certificates of analysis and compliance with international standards like ISO or GMP. Quality indicators to evaluate include color consistency, melting point range, and absence of impurities. Price negotiation may be possible for bulk purchases, with typical order quantities ranging from 25kg drums to metric ton shipments. Lead times can vary from 2-6 weeks depending on supplier location and inventory levels. Establishing long-term contracts with reliable suppliers can ensure consistent quality and favorable pricing.
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