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Silane USi-6227 – Dichlorodimethylsilane (DMC)
High-Reactivity Chlorosilane Monomer for Methyl Silicone Synthesis
CAS No.: 75-78-5
EINECS No.: 200-901-0
Molecular Weight: 129.06 g/mol
Chemical Name:
Dichlorodimethylsilane
Synonyms:
DMC; M₂Silane USi-6227 is a high-purity dichlorodimethylsilane (DMC)—a foundational chloro-functional organosilane featuring two methyl groups and two highly reactive chlorine atoms bonded to silicon. As one of the most important monomers in organosilicon chemistry, DMC serves as the primary building block for polydimethylsiloxane (PDMS), silicone oils, rubbers, resins, and specialty intermediates like D4 and DMC cyclics. Its high reactivity enables efficient hydrolysis and condensation for scalable silicone production.
🧪 Product Description
Chemical Formula: (CH₃)₂SiCl₂
Chemical Structure:
![Structure: (CH₃)₂–Si–Cl₂]USi-6227 is a core intermediate in the entire methyl silicone value chain:
- Undergoes rapid hydrolysis with water to form linear and cyclic silanols, which then condense into PDMS polymers
- Primary feedstock for producing D4 (octamethylcyclotetrasiloxane) and D3/D5 cyclics—key monomers for high-molecular-weight silicones
- Used directly in the synthesis of silicone oils, silicone rubbers, silicone resins, and modified silicones
- Also employed in the manufacture of high-strength, heat-resistant carbon fiber composites via surface functionalization
⚠️ Critical Note: DMC is extremely moisture-sensitive, corrosive, and toxic. It reacts violently with water, releasing hydrogen chloride (HCl) gas. It is not a coupling agent—but exclusively an industrial chemical intermediate for controlled synthesis under anhydrous conditions.
📊 Typical Technical Data
The following values are typical and not intended for specification. Please confirm with our technical team before finalizing product requirements.
Parameter Specification Appearance Colorless and transparent liquid, free of non-chemical impurities Specific Gravity (20°C) 0.956 – 0.958 g/cm³ Refractive Index (nD25) 1.3910 – 1.3930 Purity (GC, %) ≥ 99.0%
🏭 Key Applications
🔹 Primary Monomer for Polydimethylsiloxane (PDMS) Production
- Hydrolyzed and polymerized to produce linear and branched silicone backbones
- Basis for >90% of commercial methyl-based silicones
🔹 Feedstock for Cyclic Siloxanes (D3, D4, D5)
- Co-hydrolyzed and equilibrated to form high-purity D4—the key monomer for high-viscosity silicone gums via ring-opening polymerization
🔹 Synthesis of Silicone Oils & Rubbers
- Enables precise control over molecular weight, viscosity, and functionality in final products
- Used in both emulsion and bulk polymerization processes
🔹 Manufacture of High-Performance Carbon Fiber
- Serves as a precursor in surface treatments that enhance thermal stability and mechanical strength of carbonized fibers for aerospace and composites
🔹 Liquid Process Shaping & Drying Technologies
- Ideal for converting solutions, emulsions, suspensions, or pumpable pastes into powders, granules, or solid blocks via controlled reaction and drying
⚠️ Critical Safety & Handling Notes
- Extremely hazardous: Reacts violently with water/moisture, releasing toxic and corrosive HCl gas
- Flammable and corrosive: Causes severe skin/eye burns and respiratory damage
- Storage: Must be kept in original sealed containers, under dry inert atmosphere (e.g., nitrogen), in a cool, dry, well-ventilated area, away from incompatible materials
- Shelf Life: 12 months when stored at or below 35°C in unopened containers
- PPE Required: Chemical-resistant gloves, face shield, acid gas respirator, and fume hood operation mandatory
- SDS Essential: Always review the latest Safety Data Sheet at www.usi-chemical.com or upon request before handling
📦 Packaging
Supplied in corrosion-resistant, moisture-tight industrial containers:
- 25 L pail
- 200 L drum
- 1000 L IBC tote
All packaging is designed for safe transport and storage of reactive chlorosilanes.
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Trusted Global Supplier of High-Purity Dichlorodimethylsilane (DMC) for Organosilicon Manufacturing- Headquarters:
Room 2002, Overseas Chinese Plaza, No.1 Daqiao North Road, Nanjing 210031, Jiangsu, P.R. China - Factory Address:
Dongcheng Guanli District, Gaizhou 115200, Liaoning, P.R. China - Tel: +86-25-5889 5266 / 5889 5699
- Fax: +86-25-5830 5349
- Website: www.usi-chemical.com
- Email: inquiry@usichemical.com
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