In personal care fields such as skin care, color cosmetics, and sun care, the triangular balance of "volatility — light feel — formulation compatibility" of oil-phase ingredients has always been the core contradiction restricting end-product experience. Traditional polydimethylsiloxane, while inert, has high molecular weight and a heavy feel, making it difficult to provide a refreshing experience in oil-based and W/O formulations. Ordinary volatile silicones, while dry-touch, have limited compatibility with hydrocarbons and organic UV filters (e.g., OMC), prone to phase separation or affecting sunscreen efficacy. Some synthetic esters, though light, lack the unique smooth spreadability of silicones. With the continuous upgrading of comprehensive consumer demands for "non-comedogenic, lightweight and breathable, high-SPF non-whitening", finding an ethyl silicone with "ethyl substitution modification, viscosity 2.2 mm²/s, density 0.863, refractive index 1.400, high compatibility with OMC" has become the core proposition for the refinement of domestic personal care silicones.
Addressing this,
Anhui IOTA Silicone Oil Co., Ltd. officially launches
IOTA 4422 Ethyl Silicone (INCI Name: ETHYL METHICONE). Characterized by "silicone with some methyl groups replaced by ethyl groups; viscosity 2.2 mm²/s (25°C); density 0.863 (25°C); refractive index 1.400 (25°C); boiling point 227°C", backed by "ethyl side chain low viscosity + high volatility + hydrocarbon affinity", it serves as the "airy glow choice" for personal care,
achieving the leap from "traditional silicone heavy and sticky" to "ethyl silicone smooth and light".
System Positioning: Ethyl Methicone vs. Traditional Dimethicone
IOTA 4422 belongs to the ethyl-substituted polymethylsiloxane system, distinct from traditional dimethicone. Traditional dimethicone has all methyl side chains, high molecular symmetry, high viscosity, and tends to leave an oily film after spreading. Ethyl silicone innovatively replaces some methyl groups with ethyl side chains — the introduction of ethyl breaks the regular arrangement of molecular chains, reduces intermolecular forces, drops viscosity to 2.2 mm²/s, and the hydrocarbon nature of ethyl grants natural affinity with hydrocarbons and oils, thoroughly solving the shortcoming of traditional silicones: "incompatibility with oil phases".
Molecular Architecture: Ethyl Side Chain Modification + Low Viscosity High Volatility + Optical Clarity
The core competitiveness of IOTA 4422 stems from the precision molecular design of ethyl methicone:
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Ethyl Side Chain Modification: Partial replacement of methyl by ethyl introduces additional methylene units, enhancing van der Waals forces with hydrocarbon oil phases and organic UV filters, achieving high compatibility with hydrocarbons, oils, OMC, etc.
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Low Viscosity High Volatility: Viscosity only 2.2 mm²/s (25°C), boiling point 227°C, excellent volatility; quickly spreads and volatilizes after application, leaving a smooth and light dry feel with no sticky residue.
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Optical Clarity: Refractive index 1.400 (25°C), giving high optical transparency, not interfering with UV absorption in sunscreen formulations, reducing oily appearance in color cosmetics, presenting a natural and clear makeup effect.
Performance Leap: From "Heavy and Sticky" to "Smooth, Light and Highly Compatible"
Introducing IOTA 4422 brings a qualitative leap to personal care formulations:
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Excellent Volatility: Rapid evaporation, giving formulations a dry touch, suitable for anhydrous formulas and W/O systems.
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Smooth Light Feel: Extremely low viscosity brings a silky smooth experience, adding a lighter feel to W/O based and oil-based formulations, eliminating the heavy and stuffy feeling of traditional oil phases.
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High Compatibility: Highly compatible with hydrocarbons, oils, and organic UV filters like OMC, acting as a bridging ingredient to improve compatibility in multi-phase formulations.
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Improved Formulation Compatibility: Improves compatibility with formulations containing various ingredients, reducing phase separation risk and improving storage stability.
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Low Density Light Texture: Density 0.863 (25°C), lower than water, giving formulations an airy light texture.
Application Penetration: From Sun Care to Oil-Based W/O Formulations
The application boundary of IOTA 4422 covers all personal care scenarios requiring "lightness + compatibility + volatility":
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Sun Care (Main Battlefield): Highly compatible with OMC and other organic UV filters, helping to evenly disperse filters, enhancing SPF, while providing a non-sticky refreshing feel.
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Color Cosmetics: Used in foundations, lipsticks, etc., low refractive index reduces oiliness, volatility provides long-lasting wear with a dry film feel.
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Facial Oils and Serums: Adds light smooth feel to oil-based formulations, avoiding comedogenicity, suitable for oily/combination skin.
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W/O Based Formulations: Improves water-oil compatibility, reduces stickiness, enhances spreadability.
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Antiperspirants & Deodorants: As a volatile carrier, quick-drying, reducing white residue.
IOTA Technical Guide: Lightness First, Compatibility Foremost
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Application: Can be used directly as oil phase raw material or additive; recommended usage adjusted per formulation; excellent compatibility with hydrocarbons, oils, OMC for easy compounding.
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⚠️ Taboo: Avoid prolonged contact with strong acids/bases; store in cool dry place, away from fire (boiling point 227°C, beware of high temperature).
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Storage: Sealed in cool dry place, avoid direct sunlight and high temperature; managed as常规 chemical.
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Handling: Colorless transparent liquid, viscosity 2.2 mm²/s convenient for metering and pumping; refractive index 1.400 for optical testing; density 0.863 for density verification.
Industry Insight: In personal care silicones, the molecular design of ethyl methicone — "ethyl side chain modification + low viscosity high volatility + optical clarity" — is the key path to achieving the dual-core drive of "light feel + high compatibility" —
the introduction of ethyl solves the industry pain point of traditional dimethicone: "incompatibility with oil phases", while the ultra-low viscosity of 2.2 mm²/s ends the application shortcoming of volatile silicones: "poor compatibility with OMC". IOTA 4422, with "INCI ETHYL METHICONE + viscosity 2.2 mm²/s + density 0.863 + refractive index 1.400 + boiling point 227°C" hard metrics,
fills the key supply chain link for domestic ethyl silicone in personal care (sun care/W/O/oil-based formulations), providing a mass-producible light-weight high-performance silicone oil for downstream daily chemical enterprises. This confirms that domestic personal care silicones are leaping toward "dimethicone → methyl silicone → ethyl silicone" in terms of lightness and compatibility, with growing technical say in high-end personal care fields.
