In skincare and haircare cosmetic formulation, traditional mineral oil is occlusive, comedogenic, greasy and non-antioxidant; pure dimethyl silicone oil has limited compatibility with organics, is hard to emulsify and gives low refractive gloss; high-viscosity phenyl silicones are difficult to emulsify with heavy skin feel; volatile silicones offer only transient slip without lasting moisturization; common synthetic esters oxidize and turn rancid; cosmetic bases demand rising alcohol solubility and low-temperature stability that single oils rarely satisfy. For specifications demanding "phenyl methyl siloxane, easy emulsification, high refractive index, alcohol soluble, antioxidant, dual skincare-haircare function", a strictly controlled cosmetic-grade polymethylphenylsiloxane places aesthetic and sensory balance at one silicone node. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches Phenyl Methyl Cosmetic Silicone Oil IOTA 556 (INCI Phenyl Trimethicone; chemical name polymethylphenylsiloxane; alias methylphenyl polysiloxane). Characterized by "CAS 73559-47-4; colorless liquid; viscosity (25℃) 22.5; specific gravity (25℃) 0.980; refractive index (25℃) 1.46; flash point >100℃; acid value 0.1mg KOH/g; advantages: easy emulsification, good compatibility with cosmetic ingredients, antioxidant, non-greasy pure natural skincare feel, good anti-tack, gloss and softness for better hair care; applications: waterproof additive, tack reducer in lotions/creams, sprays, shaving lotions, hair gels, haircare and hair gloss; excellent alcohol solubility, readily soluble in 95% ethanol at room temperature, up to 50% w/w even at 4℃; general emulsification technology applicable; JSCI name methylphenyl polysiloxane code 104207, CLS list 1-11 unrestricted; storage room temp or ≤25℃ sealed 30 months from production; packaging 25kg/200kg drum, sample 200g; restriction: not for medical or pharmaceutical use; brand IOTA", backed by "phenyl methyl emulsifiable + RI 1.46 + broad alcohol solubility", it serves as a cosmetic-grade polymethylphenylsiloxane fluid for skincare and haircare. System Positioning: Cosmetic-Grade Polymethylphenylsiloxane Among Personal Care Silicone Families Within cosmetic silicone families, IOTA 556 is a polymethylphenylsiloxane (Phenyl Trimethicone type), distinct from pure dimethyl silicones (no phenyl, lower RI, narrow compatibility), high-viscosity phenyl silicones (hard to emulsify, poor spread), volatile cyclosiloxanes (no residual moisturization, regulatory restricted), mineral oils and synthetic esters (occlusive, oxidizable, no silicone silkiness). IOTA 556 uses phenyl-modified methylsiloxane backbone, RI raised to 1.46 for high gloss and antioxidant, viscosity 22.5 (25℃) for moderate spread, positioning as a universal cosmetic phenyl-methyl silicone for "skincare lotions/creams/sprays/shaving + haircare gels/gloss", rather than an industrial silicone or high-viscosity structure controller. Molecular Architecture: Polymethylphenylsiloxane + Phenyl/Methyl Coproportion + Viscosity 22.5 + RI 1.46 + Broad Alcohol Solubility IOTA 556 is a colorless liquid, core structure being methyl and phenyl copolymer siloxane chain. Phenyl introduction raises molecular polarizability and refractive index to 1.46, granting excellent gloss and UV antioxidant; methylsiloxane backbone maintains flexible spread and low surface tension for non-greasy natural skincare film; viscosity 22.5 (25℃) balances flow and film thickness for pumping and skin spread; specific gravity 0.980 light on skin; flash point >100℃ for safer production; acid value 0.1mg KOH/g extremely low, mild and skin-friendly; excellent solubility in 95% ethanol—readily soluble at room temperature, up to 50% w/w even at 4℃—broadening alcohol-based formulations, sprays and clear products; JSCI code 104207, CLS list 1-11 unrestricted for Japan and international cosmetic compliance. Performance Leap: From "Mineral Oil Comedogenic, Dimethyl Silicone Low Gloss" to "Phenyl Methyl Emulsifiable, Cosmetic Dual-Effect" With IOTA 556, skincare and haircare formulations improve jointly: emulsification ease—general technology suffices, lowering production barrier; compatibility—blends well with cosmetic ingredients as waterproof additive and organic tack reducer; antioxidant—phenyl captures free radicals, delaying formulation oxidation; sensory—non-greasy pure natural skincare feel, anti-tack avoids stringy paste; haircare—gloss and softness better care hair in gels and gloss agents; solubility—broad alcohol solubility fits transparent sprays, toners and alcohol-based sunscreens; safety—flash >100℃, acid value 0.1, JSCI/CLS compliance secure production and application. Application Penetration: From Skincare Lotions to Hair Gloss Agents IOTA 556 covers two core scenarios. Skincare systems: lotions, creams, sprays, shaving lotions—emphasizing waterproofing, tack reduction, antioxidant film; trial per emulsification system. Haircare systems: hair gels, haircare and hair gloss—emphasizing gloss, softness, anti-tack without buildup; trial per silicone addition ratio. ⚠️ Taboo: not for medical or pharmaceutical use; read product safety data sheet before use; store room temp or ≤25℃ sealed, avoid heat and contamination; though flash >100℃, manage as general chemical. IOTA Technical Guide: General Emulsification, Alcohol Dissolution, Seal Below 25℃ IOTA 556 is a colorless liquid. Use general emulsification technology in production; dissolve in 95% ethanol at room temperature or down to 4℃ for alcohol-based systems; use as waterproof additive and tack reducer in skincare, gloss and softener in haircare. Packaging 25kg/200kg drum, sample 200g. Store in sealed container at room temp or ≤25℃, shelf life 30 months from production; FIFO. Industry Insight: Cosmetic silicone selection is not the more phenyl the better, but using viscosity for spread and film feel, refractive index for gloss brightness, alcohol solubility for formulation latitude, acid value for mildness, JSCI/CLS compliance for regulatory access. For cosmetic formulators, IOTA 556 uses one CAS 73559-47-4, viscosity 22.5, RI 1.46, flash >100℃, acid value 0.1 polymethylphenylsiloxane across skincare and haircare, taking phenyl methyl emulsifiable, cosmetic dual-effect and alcohol compliance as batch-checkable anchors, securing gloss, sensory and regulatory safety simultaneously.