Overview
Homosalate is an ester formed from menthyl alcohol and salicylic acid, primarily functioning as an organic ultraviolet (UV) filter. First developed in the 1950s, it has become one of the most commonly used UVB absorbers in sun care formulations globally. The compound absorbs UV radiation in the 290-315 nm range, making it particularly effective against sunburn-causing UVB rays. As a non-water-soluble ingredient, homosalate is valued for its compatibility with oil-based formulations and its ability to remain effective on skin during water exposure. Its widespread adoption stems from its balance of efficacy, stability, and relatively low irritation potential compared to some alternative UV filters.
Physical and Chemical Properties
Homosalate presents as a viscous liquid at room temperature with minimal color and a faint characteristic odor. Its chemical structure features both aromatic and aliphatic components, giving it unique solubility characteristics - readily dissolving in organic solvents and oils while being virtually insoluble in water. This lipophilic nature makes it particularly suitable for oil-phase formulations in emulsions. The compound demonstrates good photostability, resisting degradation when exposed to sunlight, which is crucial for maintaining sunscreen efficacy. Its logP value of approximately 5.5 indicates strong lipid solubility, contributing to its skin adherence properties. Homosalate remains stable under normal storage conditions but may degrade when exposed to strong oxidizers or extreme pH conditions.
Main Applications
The primary application of homosalate is as a UV filter in sunscreen products, where it typically comprises 4-15% of the formulation. It's commonly combined with other UV filters to create broad-spectrum protection, particularly pairing well with UVA absorbers like avobenzone. Beyond sunscreens, it finds use in daily moisturizers with SPF, lip balms, and cosmetic products offering incidental sun protection. In industrial contexts, homosalate occasionally serves as a light stabilizer in plastics and coatings where UV resistance is required. However, the vast majority of global production is directed toward personal care applications. Formulators value its ability to enhance the solubility of other UV filters and improve overall product spreadability.
Safety and Storage
Homosalate is generally considered safe for topical use at approved concentrations, with regulatory approvals in the EU, US, and most international markets. The FDA permits use up to 15% concentration in OTC sunscreen products. Potential mild side effects may include temporary skin irritation or allergic reactions in sensitive individuals, though incidence rates remain low. Proper storage requires protection from direct sunlight and moisture in tightly sealed containers, preferably under nitrogen atmosphere for bulk quantities. The material is not considered flammable but should be kept away from strong oxidizers. Shelf life typically exceeds two years when stored correctly. Manufacturers should conduct stability testing when formulating to ensure product integrity under expected use conditions.
B2B Procurement Guide
When sourcing homosalate, buyers should prioritize suppliers with pharmaceutical-grade production capabilities and appropriate GMP certifications. Key specifications to verify include purity (≥98%), residual solvent levels, and heavy metal content. Request batch-specific certificates of analysis and confirm regulatory status for your target markets, as approval status varies slightly by region. For large-volume purchasers, consider negotiating contracts with tier-1 manufacturers rather than distributors to ensure consistent quality and better pricing. Technical support availability for formulation assistance can be valuable for cosmetic producers. Current market prices fluctuate based on crude oil derivatives costs, with typical bulk prices ranging $20-$50/kg depending on quantity and purity requirements.
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