In personal care fields such as lotions, creams, aftershave lotions, hair sprays, and hair gloss agents, the four-dimensional indicators of "anti-tack — glossiness — alcohol solubility & compatibility — oxidation resistance" of silicone ingredients have always been the core contradiction restricting end-product texture and consumer satisfaction. Traditional polydimethylsiloxane, while providing basic slip, has high molecular symmetry and low refractive index (about 1.40), making it difficult to impart a transparent gloss. Compatibility in alcohol-containing formulations (e.g., aftershaves, hair sprays, sprays) is limited, prone to turbidity or precipitation. Some synthetic oils, though light, tend to be tacky and lack the unique silky spreadability of silicones. With the continuous upgrading of comprehensive consumer demands for "non-greasy, anti-tack, high gloss, easy emulsification", finding a phenyl-modified silicone with "phenyl modification, viscosity 22.5 cSt, specific gravity 0.980, refractive index 1.46, flash point >100°C, acid value 0.1 mg KOH/g" has become the core proposition for the refinement of domestic personal care silicones.
Addressing this,
Anhui IOTA Silicone Oil Co., Ltd. officially launches
IOTA 556 Cosmetic Methylphenyl Silicone (INCI Name: Phenyl Trimethicone, Polyphenylsilsesquioxane, CAS# 73559-47-4). Characterized by "colorless liquid; viscosity 22.5 cSt (25°C); specific gravity 0.980 (25°C); refractive index 1.46 (25°C); flash point >100°C; acid value 0.1 mg KOH/g; chemical name: polymethylphenylsiloxane", backed by "phenyl side chain high refractive + polymethylsiloxane inert backbone + excellent alcohol solubility", it serves as the "gloss-soft choice" for personal care,
achieving the leap from "traditional silicone dull and tacky" to "phenyl silicone anti-tack glossy soft".
System Positioning: Polymethylphenylsiloxane vs. Traditional Polydimethylsiloxane
IOTA 556 belongs to the phenyl-modified polymethylsiloxane system, distinct from traditional polydimethylsiloxane. Traditional dimethicone has all methyl side chains, highly symmetric molecules, low refractive index, insufficient gloss after spreading, and limited solubility in alcohol-based systems. Phenyl silicone innovatively introduces phenyl groups into the siloxane backbone — the phenyl group breaks the regular arrangement of molecular chains, lowers surface tension, and gives the product a higher refractive index (1.46) and natural glossiness. Meanwhile, the hydrophobic nature and steric hindrance of phenyl bring excellent anti-tack properties and oxidation resistance, thoroughly solving the industry pain points of traditional silicones: "dull, easy to become tacky".
Molecular Architecture: Phenyl Side Chain High Refractive + Polymethylsiloxane Backbone + Excellent Alcohol Solubility
The core competitiveness of IOTA 556 stems from the precision molecular design of polymethylphenylsiloxane:
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Phenyl Side Chain High Refractive: The phenyl group gives the molecule a high refractive index (1.46), forming a bright film on skin or hair, providing excellent gloss; the steric hindrance effect of phenyl provides good anti-tack characteristics, eliminating the sticky feeling of traditional oils.
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Polymethylsiloxane Backbone: Retains the softness, easy emulsification, and physiological inertness of organosiloxane, providing a pure natural skin care film feel to the skin, non-greasy; also has oxidation resistance to extend formulation stability.
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Excellent Alcohol Solubility: Easily soluble in 95% ethanol at room temperature, and up to 50% (by weight) at temperatures as low as 4°C, enabling perfect adaptation to various alcohol-based formulations (e.g., aftershave, hair spray, spray), broadening application boundaries.
Performance Leap: From "Dull and Tacky" to "Anti-Tack Glossy Easy Emulsification"
Introducing IOTA 556 brings a qualitative leap to personal care formulations:
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Excellent Anti-Tack: Good anti-tack properties, reducing formulation stickiness and improving dry feel during application.
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Glossy Softness: High refractive index brings transparent gloss, giving hair a natural shine; softness improves hair feel, making it an ideal hair gloss agent and hair spray ingredient.
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Easy Emulsification: Can be easily emulsified using general emulsification technology, lowering production barriers and facilitating compounding.
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Excellent Compatibility: Highly compatible with cosmetic ingredients, can be used as a water-repellent additive to reduce the tackiness of organic ingredients.
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Oxidation Resistant Non-Greasy: Oxidation resistance protects formulation activity; non-greasy feel provides a pure natural skin care mask-like experience.
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Low Acid Value High Purity: Acid value only 0.1 mg KOH/g, high purity, gentle and non-irritating to skin.
Application Penetration: From Skin Care Lotions to Hair Spray Gloss
The application boundary of IOTA 556 covers all personal care scenarios requiring "anti-tack + gloss + alcohol solubility":
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Skin Care (Main Battlefield): Used in lotions and creams, emulsions and sprays, aftershave lotions, as water-repellent additives to reduce tackiness of organic ingredients, providing a non-greasy skin care film feel.
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Hair Care: Used as hair spray, hair care and hair gloss agent, giving hair gloss and softness for better care.
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Alcohol-Based Formulations: With excellent solubility in 95% ethanol, widely used in aftershaves, sunscreen sprays, styling gels and other alcohol-containing systems.
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Color Cosmetics Aid: High refractive index can be used in lipsticks, foundations, reducing oiliness while providing a satin gloss.
IOTA Technical Guide: Alcohol Soluble Emulsification, Seal from Light
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Application: Easy to emulsify, general emulsification technology is sufficient; recommended for lotions, creams, aftershave lotions, hair sprays, hair gloss agents; excellent compatibility with cosmetic ingredients.
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⚠️ Taboo: This product cannot be used for medical or pharmaceutical purposes; read the Product Safety Data Sheet before use; flash point >100°C, beware of high temperature; avoid prolonged contact with strong acids/bases.
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Storage: Store in sealed container at room temperature or below 25°C, shelf life 30 months (from date of manufacture); keep away from fire, sealed from moisture.
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Handling: Colorless liquid, viscosity 22.5 cSt convenient for metering; refractive index 1.46 for optical testing; specific gravity 0.980 for density verification; packaging: 25 kg drum and 200 kg drum, sample 200 g available; regulatory status: under JSCI name methylphenyl polysiloxane code 104207, CLS directory 1-11, not restricted.
Industry Insight: In personal care silicones, the molecular design of polymethylphenylsiloxane — "phenyl side chain high refractive + polymethylsiloxane backbone + excellent alcohol solubility" — is the key path to achieving the trinity of "anti-tack + gloss + alcohol solubility" —
the introduction of phenyl solves the industry pain point of traditional dimethicone: "low refractive index, dull, easy tackiness", while the excellent solubility in 95% ethanol ends the application shortcoming of ordinary silicones: "cannot be used in alcohol-based transparent formulations". IOTA 556, with "INCI Phenyl Trimethicone + viscosity 22.5 cSt + specific gravity 0.980 + refractive index 1.46 + acid value 0.1 mg KOH/g" hard metrics,
fills the key supply chain link for domestic phenyl silicone in personal care (skin care/hair care/alcohol-based formulations), providing a mass-producible glossy high-performance silicone oil for downstream daily chemical enterprises. This confirms that domestic personal care silicones are leaping toward "dimethicone → methyl silicone → phenyl-modified silicone" in terms of gloss and anti-tack properties, with growing technical say in high-end personal care fields.
