In daily chemical, industrial manufacturing and material processing, single-function oils often fall short: mineral oils or synthetic esters in cosmetics compromise spreadability and breathability, risking comedones or greasiness; water-based mold release agents leave water marks affecting post-coating or bonding, while solvent-based ones evaporate too fast needing frequent reapplication; conventional hydrocarbon lubricants solidify at low temperature and coke at high temperature, failing to cover -50℃ to 200℃ continuous operation; cationic softeners for textiles have poor wash durability and impair moisture wicking; incompatible defoamers bleed, float or cause cratering. For specifications demanding "multi-viscosity selectable, chemical inertness, wide temperature tolerance, combined lubrication/defoaming/softening/insulation", a strictly controlled dimethyl silicone oil places cross-industry functional carrier at one foundational node. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches Dimethyl Silicone Oil IOTA-201 (chemical name polydimethylsiloxane, formula (CH₃)₃SiO[(CH₃)₂SiO]ₙSi(CH₃)₃). Six viscosity grades: 201-10 (viscosity 25℃ 10±2 mPa·s, flash point ≥160℃, density 0.930-0.940 g/cm³, volatile ≤3%), 201-20 (20±4 mPa·s, flash ≥210℃, density 0.945-0.955 g/cm³, volatile ≤2%), 201-50 (50±5 mPa·s, flash ≥270℃, density 0.955-0.965 g/cm³, volatile ≤1.5%), 201-100 (100±5 mPa·s, flash ≥310℃, density 0.960-0.970 g/cm³, volatile ≤1.0%), 201-200 (200±10 mPa·s, flash ≥310℃, density 0.962-0.972 g/cm³, volatile ≤1.0%), 201-350 (350±10 mPa·s, flash ≥310℃, density 0.965-0.975 g/cm³, volatile ≤1.0%). Colorless transparent synthetic polymer; slippery, soft, hydrophobic; good chemical stability, electrical insulation, wide-temp resistance; high flash, low freezing point; usable -50℃ to +200℃ long-term; low viscosity-temperature coefficient, high compressibility, low surface tension, low specific heat/thermal conductivity. Applications: skincare creams/bath/shampoo softening and silky feel; rubber/plastic/latex/PU mold release/isolation/brightening; machinery/auto/instrument/electric lubrication, liquid spring, cutting fluid, buffer oil, transformer oil, brake fluid, instrument damping oil, frame molding release; textile/apparel softener, water repellent, hand feel improver, sewing thread lube, spinneret lube, interlining aid; leather softening, water repellency, feel agent, defoamer, brightener; chemical/coating/building defoamer, lubricant, weather-resistant coating; copolymerization into new materials. Dosage from ppm to >99% per application. Cautions: contact with high-concentration strong acid/base or Lewis acid tends to degrade/volatilize (worse at higher temp); low-concentration acid/base or prolonged high-temp contact may increase viscosity to crosslink. Packaging: 50kg PE drum or 200kg iron drum. Store sealed at room temp in dry ventilated place, avoid acid/base. Non-hazardous storage/transport. Brand IOTA. Backed by "six viscosity grades + full-temp stability + chemical inertness", it serves as a universal foundational PDMS carrier. System Positioning: Dimethyl Silicone Oil Among Linear Silicone Families Within silicone oil families, IOTA-201 is a fully methyl-substituted linear polydimethylsiloxane, distinct from phenyl silicone oils (radiation-resistant but costly and narrow compatibility), amino silicone oils (reactive, yellowing-prone, for fiber grafting), hydride silicone oils (Si–H crosslinkable, for waterproof filming), and vinyl silicone oils (requiring peroxide or Pt cure, for addition elastomers). IOTA-201 uses bis-trimethylsiloxy end-blocking and full methyl shell for ultimate chemical inertness and low surface tension; six grades from 10 to 350 mPa·s cover free-flowing to thick semi-solid. It positions as a universal base oil across "cosmetics/release/lubrication/textile/leather/defoaming/insulation", rather than a functional modified oil or reactive intermediate. Molecular Architecture: Bis-Trimethylsiloxy End + Dimethylsiloxane Backbone + Six Polymerization Degrees + Low Surface Tension Inert Shield IOTA-201 formula (CH₃)₃SiO[(CH₃)₂SiO]ₙSi(CH₃)₃ features terminal trimethylsiloxy groups terminating chain growth and maintaining inertness; the backbone of dimethylsiloxane repeating units gives extremely low surface tension and excellent hydrophobicity; high Si–O bond energy (~452 kJ/mol) supports -50℃ to +200℃ long-term service; polymerization degree n determines viscosity grade—lower n gives lower viscosity and higher volatile (201-10 ≤3%), higher n gives higher viscosity and lower volatile (201-100+ ≤1.0%); flash point rises from 160℃ to 310℃ with viscosity; density 0.930-0.975 g/cm³ increases with MW; low viscosity-temperature coefficient means stable viscosity across temperatures, ideal for wide-temp lubrication and damping. Performance Leap: From "Single-Function Narrow-Temp, Easy Degradation" to "Multi-Vis Universal, Inert Stable Long-Protect" With IOTA-201, seven application sectors improve jointly: sensory—low-viscosity grades (201-10/20) deliver silky non-greasy spread, replacing mineral oils to reduce comedogenic risk; mold release—mid grades (201-50/100) form uniform isolation film without water marks or post-bonding interference; lubrication—high grades (201-200/350) serve as mechanical damping and lube across wide temps without coking; textile—low surface tension enables even fiber coating for softness and water repellency without impairing breathability; defoaming—low surface tension and insolubility enable rapid film-spreading rupture of foam lamellae; electrical—high insulation and thermal stability for transformer oil and damping media; chemical inertness—stable against normal acid/base, only degrading under high-temp high-concentration strong acid/base or Lewis acid exposure. Application Penetration: From Daily Skincare to Industrial Lube and Architectural Defoaming IOTA-201 covers seven core scenarios. Daily skincare and haircare: creams/bath/shampoo softening—emphasizing low-vis spread and non-comedogenicity; trial by formula. Rubber/plastic mold release: injection/casting/PU foaming—emphasizing mid-vis uniform film; trial by mold/process. Machinery/electric lubrication and insulation: lube/cutting/transformer/damping/brake—emphasizing high flash wide-temp; trial by equipment condition. Textile/apparel softening and water repellency: sewing lube/spinneret lube/interlining—emphasizing low surface tension coating; trial by fabric type. Leather auxiliaries: softening/water repellency/feel/defoaming/brightening—emphasizing multi-effect blending; trial by leather type. Chemical/coating/building defoaming and weather resistance: defoamer/lubricant/weather coating—emphasizing compatibility and thermal stability; trial by system. Copolymer new materials: copolymerize with other monomers into hybrid silicones. ⚠️ Taboo: avoid high-concentration strong acid/base and Lewis acids (reaction intensifies at high temp); low-concentration acid/base or prolonged high-temp contact may thicken or crosslink; store sealed at room temp in dry ventilated place away from acid/base; non-hazardous transport. IOTA Technical Guide: Select by Viscosity, Avoid Strong Acid/Base, Room-Temp Sealed Non-Haz Transport IOTA-201 is a colorless transparent liquid in 50kg PE drum or 200kg iron drum. Select grade by application: skincare 10-50 mPa·s, mold release 50-100 mPa·s, lubrication/damping 200-350 mPa·s; dosage ranges from ppm-level defoaming to nearly 100% base oil, determined by target system trial. Store sealed at room temperature in dry ventilated place, avoid acid/base contact; non-hazardous storage and transport. Industry Insight: Dimethyl silicone oil selection is not the higher viscosity the better, but using viscosity grade for application method and film thickness, volatile content for high-temp service life, flash point for safety window, and polymerization degree for compatibility and migration rate. For engineers across cosmetics, molding, lubrication, textile and building materials, IOTA-201 uses one six-grade 10-350 mPa·s PDMS spanning skincare, release, lubrication, softening, defoaming and insulation, taking multi-vis versatility, inert stability and long-term protection as batch-checkable anchors, securing performance floor and process flexibility of cross-domain formulations.