Dichloromethylsilane , 97% , 75-54-7
Synonym(s):
Methyldichlorosilane
CAS NO.：75-54-7
Empirical Formula: CH4Cl2Si
Molecular Weight: 115.03
MDL number: MFCD00000494
EINECS: 200-877-1
PRODUCT Properties
| Melting point: | -93 °C |
| Boiling point: | 41 °C(lit.) |
| Density | 1.105 g/mL at 25 °C(lit.) |
| vapor density | 4 (vs air) |
| vapor pressure | 6.79 psi ( 20 °C) |
| refractive index | n |
| Flash point: | −26 °F |
| storage temp. | 2-8°C |
| solubility | DECOMPOSES |
| form | Liquid |
| color | Colorless |
| Specific Gravity | 1.11 |
| Odor | Acrid; sharp, hydrochloric acid-like. |
| explosive limit | >55% |
| Water Solubility | DECOMPOSES |
| Sensitive | Air & Moisture Sensitive |
| Hydrolytic Sensitivity | 8: reacts rapidly with moisture, water, protic solvents |
| BRN | 1071194 |
| InChIKey | NWKBSEBOBPHMKL-UHFFFAOYSA-N |
| CAS DataBase Reference | 75-54-7(CAS DataBase Reference) |
| NIST Chemistry Reference | Silane, dichloromethyl-(75-54-7) |
| EPA Substance Registry System | Methyldichlorosilane (75-54-7) |
Description and Uses
Methyl dichlorosilane, is a colorless liquid with a sharp irritating odor. It is a dangerous fire risk, corrosive, and water reactive. The flammable range is wide, from 6% on the lower end to 55% on the upper end. Boiling point is 107°F (41°C), flash point is 15°F (?9°C), and ignition temperature is more than 600°F (315°C). Specific gravity is 1.11, which is heavier than water. Vapors are heavier than air and will travel to ignition sources. It is immiscible in water and decomposes on contact to release hydrogen chloride gas. Methyl dichlorosilane is toxic by inhalation and skin absorption; it is irritating to the skin, eyes, and respiratory system. Contact with the material may cause burns to the eyes and skin. The four-digit UN identification number is 1242. The NFPA 704 designation is health 3, flammability 3, and reactivity 2. The white space at the bottom of the diamond has a W with a slash through it, indicating water reactivity. The primary use is in the manufacture of siloxanes, which are straight-chained compounds similar to paraffin hydrocarbons.
Dichloromethylsilane is a monomer ('building block') in the production of silicone polymers. An intermediate (starting material) in the production of other organic and inorganic chemicals. In the electronics industry for the production of ultra-pure polysilicon and in the manufacture of semiconductors and photovoltaics.
Safety
| Symbol(GHS) |    GHS02,GHS05,GHS06 |
| Signal word | Danger |
| Hazard statements | H225-H261-H301+H331-H314 |
| Precautionary statements | P210-P231+P232-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 |
| Hazard Codes | F,T,C |
| Risk Statements | 11-14/15-28-34-37-35-20/22 |
| Safety Statements | 16-26-36/37/39-43-45-7/8-30 |
| RIDADR | UN 1242 4.3/PG 1 |
| WGK Germany | 1 |
| RTECS | VV3500000 |
| F | 10-21 |
| Autoignition Temperature | 471 °F |
| TSCA | Yes |
| HazardClass | 4.3 |
| PackingGroup | I |
| HS Code | 29319090 |
| Hazardous Substances Data | 75-54-7(Hazardous Substances Data) |
