In the "small-molecule hub" of the organosilicone industry chain, balancing boiling point and reactivity directly dictates suitability in cosmetic carriers, silicone rubber molecular weight control, and vapor-phase deposition. Conventional dimethicone, with high molecular weight and poor volatility, fails as a lightweight carrier; while low-boil hydrogen-containing silicones are reactive, they are flammable, explosive, and skin-irritating, limiting personal care use. With rising demand for "low-boil, high-purity, chemically inert" small-molecule siloxanes in cosmetic volatiles, silicone rubber molecular weight control, and vapor-phase hydrophobing, sourcing Hexamethyldisiloxane (MM, (CH₃)₃Si–O–Si(CH₃)₃) with ≥99% purity and ~100℃ boiling point has become the core gap for domestic silicone basic feedstock localization. Addressing this "low-boil capping" pain point, Anhui IOTA Silicone Oil Co., Ltd. officially launches Hexamethyldisiloxane IOTA 005 (Alias: HMDSO / Silicone ether / MM; CAS 107-46-0; EINECS 203-492-7). Characterized by "colorless transparent liquid, ≥99.0% purity, MW 162.38, density 0.764 g/cm³ (25℃), boiling point 99.5-100.5℃, flash point -1.1℃, refractive index 1.3765-1.3785, 150KG/200L drum", and backed by "dual-methyl capped inert backbone + low-boil fast flash + high-purity low-impurity", it serves as the "small-molecule anchor" for cosmetic volatile silicones, silicone rubber capping agents, silazane synthesis feedstock, and vapor-phase hydrophobing agents. Molecular Architecture: Hexa-Methyl Capped + Siloxane Bridge Low-Boil Logic IOTA 005 structure: (CH₃)₃Si–O–Si(CH₃)₃, the simplest linear polysiloxane (MM):

• Hexa-Methyl Capped Inert Core: Both ends and backbone are fully methyl-capped (–CH₃), devoid of active functionalities (–H, –OH, –Cl). This full methylation grants extreme chemical inertness, thermal stability, and hydrophobicity, ensuring no reaction with actives (vitamins, antioxidants) and formulation stability.
• Low-Boil Fast-Flash Trait: Molecular weight only 162.38 g/mol, boiling point ~100℃. This makes it an ideal lightweight volatile carrier — spreads instantly on skin and flashes off, leaving no oily residue, providing immediate dry-feel superior to higher-boil solvents.
• Capping Agent & Synthon: In silicone rubber polymerization, MM acts as a chain transfer agent or capping agent to precisely control gum molecular weight, preventing processing difficulties from excessive viscosity. It is also a key precursor for Hexamethyldisilazane (HMDS), widely used in semiconductor cleaning and pharma synthesis.

Performance Leap: From "High-Visc Residue" to "Low-Boil Flash-Off" Incorporating IOTA 005 enables qualitative leaps downstream:

• Cosmetic Lightweight Carrier: Replaces part of D5/D6 as volatile silicone in perfumes, antiperspirants, dry shampoos — delivers instant dry-feel with no residue; low surface tension lifts spreadability.
• Silicone MW Control: In HTV/RTV synthesis, acts as capping agent (0.5-3% of monomers) to tailor MW distribution, improving flow and extrusion while preventing scorch.
• Vapor-Phase Hydrophobing: Treats fumed silica, CaCO₃; methyl groups react with surface OH, imparting excellent hydrophobicity and improving dispersion in organic polymers.
• Analytical Solvent: Serves as GC stationary phase or analytical reagent for low-MW organics; inert solvent for organometallic reactions.

Application Penetration: From Cosmetic Mists to Chip Hydrophobing IOTA 005 covers sectors doubly sensitive to "low-boil + inertness":

• Cosmetics: Perfumes, antiperspirants, dry shampoos, nail polishes, makeup removers (volatility aid).
• Silicone Synthesis: Capping agent/chain transfer agent for silicones, silicone oils, gums, resins.
• Electronics & Semiconductor: Wafer lithography priming hydrophobic agent, plasma-deposition SiO₂ precursor, residue-free cleaning for precision electronics.
• Pharmaceutical & Fine Chem: Intermediate for silazane synthesis, pharmaceutical silicone adjuvant, silylation reagent in organic synthesis.
• Material Modification: Durable hydrophobing for glass, ceramics, metals, fabrics; GC stationary phase.

IOTA Technical Guide: Sealed Moisture-Proof, Explosion-Proof, Fire-Avoiding

• Synthesis: Added as capping agent in silicone rubber polymerization for precise MW control; participates in amination as HMDS synthesis feedstock.
• Taboo: Highly flammable liquid (flash point -1.1℃) — Store in cool, dry, well-ventilated non-combustible warehouse, temperature ≤30℃; prevent sunlight, sealed packaging avoiding air contact, prevent moisture; separate from oxidizers/acids/bases; explosion-proof lighting/ventilation, no spark-generating tools; transport as dangerous goods.
• Storage: 150KG net weight in 200L plastic or plastic-lined iron drums; special specs available on request.

Industry Insight: Domestic breakthroughs in small-molecule organosilicone intermediate purification and MM capping agent batch stability enable IOTA 005 to fill the key supply chain link for domestic hexamethyldisiloxane in organosilicone basic feedstock, providing an import-substitution solution for downstream silicone rubber, cosmetics, semiconductor, and pharmaceutical enterprises with "≥99% purity + 99.5-100.5℃ boiling point + dual-methyl capped inertness + 150KG bulk packaging". This confirms domestic organosilicone small-molecule feedstocks are leaping toward "high-purity dual-methyl capped MM", with growing technical say in critical organosilicone intermediates.