In skincare, sun care, color cosmetics and hair conditioning, traditional polydimethylsiloxane has high viscosity, slow spread, heavy sticky skin feel; volatile cyclic silicones face regulatory restrictions in some regions; mineral oil and synthetic esters spread poorly and may clog pores; common silicone oils leave residual film affecting makeup application and sunscreen filming. For demands of "low viscosity high volatility + light spreading non-residue + high compatibility with multiple components + soft silky skin feel", a strictly controlled MT-structure methylpolytrimethylsiloxane welds volatile silicone refreshment and formula compatibility at one siloxane backbone. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches IOTA 9229 Methylpolytrimethylsiloxane. CAS 18076-97-6. INCI name Methylpolytrimethylsiloxane. MT-structure volatile siloxane. Appearance colorless transparent liquid. Viscosity (25℃) 1.5 mm²/s. Refractive index (25℃) 1.385. Density (25℃) 0.85. Content >99%. Odorless, colorless, non-irritating, low surface tension, unique volatility, good spreadability and gloss, high compatibility with cosmetic ingredients, light and fresh, non-greasy, gives skin soft silky feel, improves formulation, skin feel and spreadability. Applications: skincare, sun care, color cosmetics, deodorants, antiperspirants, hair conditioning. Package: 20L/200L steel drum and others. Storage sealed dry cool, avoid acid/base, away from fire; shelf life 24 months. Brand IOTA. System Positioning: Methylpolytrimethylsiloxane Among Cosmetic Siloxane Families Within cosmetic silicones, IOTA 9229 is an MT-structure volatile linear siloxane, distinct from high-MW PDMS (high viscosity, slow spread, residual film), cyclic polydimethylsiloxanes (some regulated), phenyl silicones (high refractive, costly, poor spread), amino silicones (reactive, color-change risk, unsuitable for color cosmetics). IOTA 9229 uses trimethylsiloxy (M units) as chain ends and methyl-substituted siloxane (T units) as backbone, forming low-viscosity volatile linear fluid, positioning as "volatile carrier for skincare/suncare + spread and gloss modifier for color cosmetics + skin-feel enhancer for deodorants/antiperspirants + light silicone for hair conditioning", rather than strong film-former or crosslink modifier. Molecular Architecture: MT Backbone + CAS 18076-97-6 + Viscosity 1.5 + Density 0.85 IOTA 9229 core is MT siloxane—chain terminated by trimethylsiloxy (M units), backbone of methyltrisiloxane (T units) repeating. M-termination blocks chain-end hydroxyl condensation, granting thermal stability and chemical inertness; T-backbone denser than dimethylsiloxane, delivering low viscosity (1.5 mm²/s) and high volatility; density 0.85 below water, RI 1.385 moderate, content >99% ensures low impurity, low irritation; odorless non-irritating allows direct skin/hair contact; low surface tension promotes rapid spreading on skin, hair and pigment surfaces. Performance Leap: From "Heavy Residue, Poor Spread" to "Methyl PolyTriMethyl, Silicone Volatile Touch" With IOTA 9229, four-way synergy: volatile refresh—low viscosity (1.5 mm²/s) and MT structure grant unique volatility, rapid evaporation non-residue, eliminating sticky oil film, giving soft silky skin; spread efficiency—low surface tension enables fast spreading on skin, hair and pigments, improving uniformity and gloss, lifting sunscreen film evenness and makeup smoothness; high compatibility—highly compatible with cosmetic oils, actives, pigments and UV filters without destabilizing formulation, serving as carrier tuning overall viscosity and feel; formula improvement—reduces tack in deodorants/antiperspirants, imparts light non-weighing silky touch in hair conditioners, avoiding traditional silicone weight. Application Penetration: From Skincare Sunscreen to Hair Conditioning Full Coverage IOTA 9229 covers five core scenarios.

• Skincare & sun care: facial serums, sunscreen creams, daily skincare—volatile carrier and spread; reduce tack, lift UV filter uniform distribution and filming.
• Color cosmetics: foundation, lipstick, eyeshadow, concealer—gloss and slip; improve pigment dispersion, lifting application smoothness and finish gloss.
• Deodorants & antiperspirants: roll-on, spray, stick—fresh feel; volatile non-residue, reduce skin tack.
• Hair conditioning: conditioner, mask, leave-in serum—light silky; spread on hair without weighing down, giving soft gloss.
• Formulation tuning: various cosmetic bases—viscosity and feel adjustment; as low-viscosity silicone component balancing overall texture.

⚠️ Taboo: though non-reactive volatile silicone, store sealed to prevent contamination; avoid long-term contact with strong acid/base to prevent backbone degradation; keep from fire (volatile organic, fire precaution); in formulation match evaporation rate with other volatile components to avoid over-fast drying. IOTA Technical Guide: 20L/200L Steel Drum, Dry Cool 24 Months IOTA 9229 is colorless transparent liquid, standard 20L/200L steel drum (and other customization). In cosmetic formulation add directly into oil phase per design ratio, homogenize evenly; recommended dosage varies by system, generally as volatile carrier or feel modifier. Seal store dry cool, avoid acid/base, away from fire; shelf life 24 months. Industry Insight: Cosmetic siloxane selection is not the lower viscosity the better, but using MT structure for evaporation rate and residue, purity for skin safety and irritation grade, surface tension for spreading efficiency, refractive index for gloss and clarity. For cosmetic formulators and product R&D engineers, IOTA 9229 uses one MT-structure methylpolytrimethylsiloxane across volatile refresh, spread enhancement, high compatibility and silky touch, taking methyl polytriMethyl and silicone volatile touch as batch-checkable anchors, securing formulation texture and consumer experience simultaneously.