Dimethyldichlorosilane
| Chemical Name: | Dimethyldichlorosilane |
| Product Category: | Silicone Monomer – Product |
| Structural Formula: |  |
| CAS No.: | 75-78-5 |
| EINECS: | 200-901-0 |
| Molecular Formula: | (CH3)2SiCl2 |
| Molecular Weight: | 129.1 |
Dimethyldichlorosilane Description
Dichlorodimethylsilane (DMDCS) (CAS 75-78-5) is a tetrahedral organosilicon compound with the chemical formula Si(CH3)2Cl2. At room temperature, it is a colorless, transparent liquid that is flammable and explosive.
DMDCS is a crucial raw material for silicone products, including silicone intermediates, silicone oils, silicone rubbers, and silicone resins. It is also used in the production of heat-resistant, high-strength carbonized fibers, making it essential for advanced material applications. Proper handling is necessary due to its reactive nature.
| Product Standard | GB/T 23953-2009 |
| Flash Point | 16℃ (closed cup) |
| Melting point | 76°C |
| Boiling point | 71℃ |
| Autoignition Temperature | 380°C |
| Relative density (water=1) | 1.07 |
| Relative vapor density (air=1) | 4.4 |
| Vapor pressure | 14.5kPa (20℃) |
| PH value | HCI is generated when it meets water. |
| Upper explosion limit [%”/0] | 3.4 |
| Lower explosion limit [%(V/V)] | 9.5 |
| Water solubility | Water reaction |
| Appearance | colorless transparent liquid with strong irritating odor |
| Mass fraction of dimethyldichloro silane / % | 99.5 |
| Mass fraction of methyltrichloro silane / % | 0.05 |
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| Nature | This product is highly toxic: irritating to the respiratory tract and skin. |
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Dimethyldichlorosilane: Guide
Dimethyldichlorosilane is a key raw material for silicone production, used in manufacturing silicone intermediates (such as D4 and DMC), silicone oils, silicone rubbers, and silicone resins. It is also essential for producing heat-resistant, high-strength carbonized fibers.
In industry, dimethyldichlorosilane is commonly used as the main raw material in the hydrolysis polycondensation process to form dimethylsiloxane, which consists of a silicon-oxygen (-Si-O-) bond as the backbone, with organic groups attached. This process produces DMC (dimethylcyclosiloxane), which can be separated to obtain octamethylcyclotetrasiloxane (D4) and other high-purity cyclic and linear siloxanes. Through chemical reactions, various reactive functional groups can be introduced into the siloxane molecular chains, creating different types of silicone intermediates for specialized applications.
