As the domestic beauty industry rapidly moves towards high-end and high-quality development, consumers' demands for the appearance and usage experience of makeup gloss, skincare texture, hair care shine, and deodorant and antiperspirant products have been continuously increasing. The demand for functional organosilicon raw materials with both optical effects and excellent skin feel for cosmetics has been growing. The 21555 high-refractive index cosmetic-grade phenylsilicone oil (INCI name: trimethylpentyltriethoxysilane) has been officially launched on the market. With its superior refractive index, good compatibility, and ease of emulsification, it has become the core raw material for optimizing the formulations of makeup, skincare, hair care, and transparent deodorant and antiperspirant products, helping cosmetics manufacturers create differentiated terminal products.
The main component of 21555 high-refractive index phenylsilicone oil is trimethylpentyltriethoxysilane. It presents as a colorless to pale yellow transparent liquid with no odor. Its basic physical and chemical indicators are stable and controllable. At 25°C, the viscosity is 175 cst, the refractive index is stably maintained within the range of 1.5775-1.5800, the specific gravity is controlled within 1.0920–1.0990, the closed-cup flash point is greater than 101.1°C, and the open-cup flash point can reach 243°C. It has outstanding heat resistance and can be adapted to most production and processing temperature conditions of cosmetics. The formulation processing process is not prone to volatilization or decomposition, and is suitable for various cosmetic processes such as creams, lotions, and oil-based systems.
The ultra-high refractive index is the core competitive advantage of 21555 phenylsilicone oil. When this product is added to makeup formulations such as lip gloss, lipsticks, liquid eyeshadow, highlights, and foundation liquids, it can significantly enhance the mirror-like gloss of the product and create a transparent and bright makeup effect, eliminating the dull and dull texture brought by ordinary silicone oil. At the same time, the raw material has a rich and non-greasy unique skin feel, excellent spreadability, and is smooth and easy to spread when applied, effectively alleviating the stickiness and heaviness caused by ingredients such as oils, esters, and humectants, optimizing the application experience of skincare and makeup products, and reducing problems such as greasy skin and sticky hands. In the hair care field, it can be applied to hair care essences, hair masks, and hair spray, evenly adhering to the hair surface, smoothing the cuticle, giving hair long-lasting moisture and shine, achieving a dual effect of softening and brightening.
The compatibility of the formula and the convenience of processing are key factors for cosmetics manufacturers to choose. 21555 high-refractive index phenylsilicone oil has good compatibility with various commonly used oils, esters, and functional raw materials in cosmetics, and is compatible with oil-based formulations and emulsification systems. No special emulsification equipment is required, and it can be emulsified with conventional processes and common emulsifiers, significantly reducing the threshold for formula adjustment and suitable for small-scale cosmetics factories and large-scale daily chemical production lines. At the same time, the antioxidant performance of the product is excellent, adding it to the formula system helps delay oil oxidation and spoilage, extending the shelf life of cosmetics. The raw material research and production follow the ethical norms of the beauty industry, no animal experiments have been conducted, and it is in line with the current trends of pure and sustainable beauty.
Different from ordinary phenylsilicone oil, 21555 high-refractive index phenylsilicone oil has a unique application scenario, which can be used to prepare transparent deodorants and body care products. Many body care formulas are prone to turbidity and stratification problems. This phenylsilicone oil has excellent transparency, and when combined, it can maintain a clear and transparent appearance of the system, while optimizing the application feel and improving the dryness and whitening problems of deodorant products. It is the preferred raw material for high-end transparent body lotions and deodorant creams.
From the perspective of storage and packaging conditions, 21555 high-refractive index cosmetic-grade phenylsilicone oil provides two mainstream packaging specifications: 20kg barrels and 195kg large barrels, meeting the needs of small-batch samples and large-scale mass production purchases. The raw material is stored in an unopened original container at a temperature of 25°C and below, with a shelf life of up to 60 months from the production date, and has strong storage stability, reducing the risk of raw material turnover loss for enterprises. At present, the process of domestic substitution for high-end cosmetics in China is accelerating continuously. More and more beauty brands are committed to creating products with unique skin sensations and distinctive visual effects, and functional organic silicon raw materials have become a breakthrough point for product formulation differentiation. For a long time, high refractive index phenylsiloxane raw materials have been heavily dependent on imports, with long supply cycles and high procurement costs. 21555 trimethylpentaphenyltrisiloxane has achieved stable mass production, with physical and chemical indicators对标ing international similar products， stable supply， and providing new raw material options for domestic makeup， hair care， and deodorant product manufacturers.
Industry experts analyze that glossiness， skin sensation， and transparency of appearance are the core competitive selling points of future makeup products. The market space for high refractive index phenylsiloxane oil with optical enhancement， sensory regulation， and multi-scenario adaptability continues to expand. 21555 high refractive index cosmetic-grade phenylsiloxane oil covers four major markets of makeup， skincare， hair care， and antiperspirant and deodorant， which can help formulation engineers simplify the system and improve the quality and feel of the formulation， and is expected to promote the implementation of more innovative makeup products. Subsequent raw material supply enterprises will also continuously provide technical support for different makeup niche formulations， helping the cosmetics industry optimize the formulation system and promoting the high-quality domestication of cosmetic organic silicon raw materials development.