Dichloro(methyl)silane

Dichloro(methyl)silane is an organosilicon compound with the molecular formula CH4Cl2Si and CAS number 75-54-7. This chemical features a silicon atom bonded to a methyl group and two chlorine atoms, making it a methylchlorosilane derivative. With a molecular weight of 115.03 g/mol, it serves as an important intermediate in silicone chemistry and surface modification applications.

Dichloro(methyl)silane is typically a colorless liquid at room temperature with a sharp, pungent odor characteristic of chlorosilanes. It is highly reactive with water, undergoing hydrolysis to form silanols and hydrogen chloride gas. The compound is soluble in most organic solvents but reacts violently with water and alcohols, making it moisture-sensitive and requiring anhydrous handling conditions.

Dichloro(methyl)silane is primarily used as a precursor in the synthesis of methylsilicone polymers and resins. It serves as a key intermediate for producing silicone elastomers, coatings, and sealants. Additionally, it functions as a surface modification agent for glass and metal substrates, and as a coupling agent in composite materials to improve adhesion between organic and inorganic phases.

Dichloro(methyl)silane requires careful handling with appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Work should be conducted in well-ventilated areas or under fume hoods due to the potential release of hydrogen chloride upon contact with moisture. Avoid contact with water, alcohols, and other protic substances, and ensure all equipment is thoroughly dried before use.

Dichloro(methyl)silane must be stored in tightly sealed, moisture-proof containers in a cool, dry environment away from water sources and humidity. Storage areas should be well-ventilated and equipped with appropriate spill containment measures. Keep away from incompatible materials such as water, alcohols, amines, and strong bases. Containers should be made of materials compatible with chlorosilanes, typically stainless steel or specialized polymers.

Dichloro(methyl)silane contact requires immediate action depending on exposure route. For skin contact, remove contaminated clothing and flush with large amounts of water for at least 15 minutes. In case of eye contact, rinse thoroughly with water and seek medical attention immediately. If inhaled, move to fresh air and seek medical help. For ingestion, do not induce vomiting and obtain immediate medical assistance.

Dichloro(methyl)silane disposal must comply with local and national hazardous waste regulations. The compound should never be poured down drains or disposed of with regular waste due to its reactive nature. Professional hazardous waste disposal services should handle the material, typically through controlled hydrolysis followed by neutralization. Empty containers may require special cleaning procedures before disposal or recycling.

Dichloro(methyl)silane is classified under ADR Class 4.3 (substances which, in contact with water, emit flammable gases), Packing Group I, indicating high danger level. Transportation requires specialized packaging, proper labeling with appropriate hazard symbols, and compliance with dangerous goods regulations. Vehicles must be equipped with appropriate safety equipment, and drivers need hazardous materials certification for legal transport.

Dichloro(methyl)silane is subject to various chemical regulations including REACH registration requirements in the European Union. While not classified as a Substance of Very High Concern (SVHC), it must comply with standard chemical safety regulations, workplace exposure limits, and transportation guidelines. Users must maintain safety data sheets and implement appropriate risk management measures according to local chemical safety legislation.

Dichloro(methyl)silane is available through specialized chemical distributors across Europe, including OYSI, a European distributor of technical chemicals. Professional chemical suppliers typically stock this compound for industrial applications. When purchasing, ensure the supplier provides proper documentation, safety data sheets, and complies with relevant regulations. Contact qualified distributors for availability, specifications, and delivery options in your region.