For chemists, engineers, and procurement specialists, a thorough understanding of a chemical's properties and handling requirements is crucial for safe and effective utilization. Dichlorodimethylsilane (CAS 75-78-5), a vital organosilicon intermediate, possesses distinct characteristics that dictate its applications and necessitate specific handling protocols. NINGBO INNO PHARMCHEM CO.,LTD., a leading manufacturer and supplier of specialty chemicals in China, is committed to providing both high-purity products and essential technical information.

Dichlorodimethylsilane is primarily known as a colorless, clear liquid with a characteristic odor. Its key physical properties, including a boiling point of approximately 70°C and a density around 1.07 g/mL at 25°C, are important for storage and processing calculations. However, its chemical reactivity is what makes it so valuable.

Reactivity and Key Chemical Characteristics

The defining chemical feature of Dichlorodimethylsilane is the presence of two reactive silicon-chlorine (Si-Cl) bonds. These bonds are highly susceptible to hydrolysis, meaning Dichlorodimethylsilane reacts readily with moisture in the air or in aqueous solutions. This reaction produces hydrochloric acid (HCl) and silanols, which rapidly condense to form polydimethylsiloxane (PDMS) chains.

  • Hydrolysis Sensitivity: Due to its reactivity with water, Dichlorodimethylsilane must be stored and handled under dry conditions, ideally under an inert atmosphere such as nitrogen, to prevent degradation and the release of corrosive HCl fumes.
  • Polymerization Precursor: The controlled hydrolysis or alcoholysis of DMDCS is the foundation for producing linear and cyclic siloxane polymers, the backbone of the silicone industry. The structure Si(CH3)2Cl2 dictates that each silicon atom will link to two oxygen atoms, leading to the characteristic Si-O-Si backbone of silicones.
  • Thermal Stability: While reactive, the resultant siloxane polymers exhibit excellent thermal stability, a testament to the strong Si-O bond.
  • Methyl Group Influence: The two methyl groups attached to silicon are responsible for many of the desirable properties of PDMS, such as flexibility, low surface tension, and hydrophobicity.

Safe Handling and Storage Practices

Given its reactivity and the potential to release corrosive HCl, proper handling is paramount:

  • Always use in a well-ventilated area or under a fume hood.
  • Wear appropriate personal protective equipment (PPE), including chemical-resistant gloves, safety goggles, and protective clothing.
  • Store in tightly sealed containers made of compatible materials, away from moisture, heat, and incompatible substances.
  • Follow the Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) recommendations provided by the supplier.

NINGBO INNO PHARMCHEM CO.,LTD. ensures that our Dichlorodimethylsilane is packaged to maintain its integrity during transport and storage. By choosing us as your manufacturer and supplier in China, you gain access to a reliable source of this critical intermediate, along with the technical support necessary for its safe and effective use. We are committed to providing quality chemicals and ensuring our customers have the information they need.