Overview
Methyltrimethylsilane is an organosilicon compound belonging to the alkylsilane family. As a tetra-substituted silane with three methyl groups and one trimethylsilyl group, it serves as a versatile building block in organosilicon chemistry. The compound was first synthesized in the mid-20th century during advancements in silicone chemistry. Industrial production typically involves the reaction of methylmagnesium halides with silicon tetrachloride or related compounds. Its commercial importance stems from its role as a precursor in silicone manufacturing and as a reagent in organic synthesis, particularly in protecting group chemistry and hydrophobization processes.
Physical and Chemical Properties
Methyltrimethylsilane presents as a highly volatile, low-viscosity liquid with a characteristic faint odor. Its low density (approximately 0.7 g/cm³) and boiling point near 55°C make it easy to handle in controlled environments. The compound exhibits exceptional thermal stability up to 300°C and resistance to hydrolysis compared to other silanes. Chemically, the Si-C bonds demonstrate moderate reactivity, allowing selective transformations while maintaining stability under various conditions. The compound's low surface tension and hydrophobic nature contribute to its effectiveness in surface modification applications. These properties are particularly valuable in creating water-repellent coatings and modifying material surfaces.
Main Applications
In the coatings industry, methyltrimethylsilane serves as a crosslinking agent and hydrophobizing additive, enhancing water resistance in architectural and industrial coatings. Its volatility and clean decomposition make it suitable for chemical vapor deposition (CVD) processes in semiconductor manufacturing. The pharmaceutical sector utilizes this compound as a protecting group for alcohols and carboxylic acids during multi-step syntheses. Additionally, it functions as a chain transfer agent in radical polymerization processes, controlling molecular weight in silicone rubber production. Emerging applications include use as a precursor for silicon carbide ceramics and in the synthesis of novel organosilicon compounds.
Safety and Storage
As a flammable liquid (Flash point < -20°C), methyltrimethylsilane requires storage in tightly sealed containers under inert atmosphere, preferably nitrogen. Storage areas should be equipped with explosion-proof electrical systems and proper ventilation to prevent vapor accumulation. Secondary containment is recommended. Personal protective equipment including chemical-resistant gloves, goggles, and flame-retardant clothing should be used when handling. In case of spills, absorb with inert material and prevent entry into waterways. The compound may form explosive mixtures with air at concentrations between 1-8% by volume. Firefighting should employ alcohol-resistant foam, dry chemical, or CO2 extinguishers.
B2B Procurement Guide
Industrial buyers should specify required purity levels (technical grade 98%, purified grade 99%+, electronic grade 99.9%), which significantly impact pricing. Packaging options range from 1L bottles to 200L drums or bulk ISO tank containers, with appropriate UN-certified packaging for hazardous materials transport. Key procurement considerations include verification of batch analysis certificates, residual solvent content, and metal impurity levels for sensitive applications. Lead times typically range from 2-6 weeks depending on quantity and location. Established suppliers in China, Germany, and the US offer competitive pricing, with MOQs commonly starting at 100kg for standard grades. Quality audits should confirm compliance with REACH and other regional chemical regulations.
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