Substance profile
Dichlorodimethylsilane
Dichlorodimethylsilane is a colorless liquid with a sharp, like hydrochloric acid odor.
01 · Identification
What Dichlorodimethylsilane is
Dichlorodimethylsilane is a colorless liquid with a sharp, like hydrochloric acid odor. Its molecular formula is C2H6Cl2Si and its molecular weight is 129.06 g/mol. It boils at 70.3 °C, melts at -16 °C.
Under the GHS it carries the signal word Danger. It is classed as corrosives.
Other names for Dichlorodimethylsilane
- dimethyldichlorosilane
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H225 | Highly flammable liquid and vapour. |
| H335 | May cause respiratory irritation. |
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
Precautionary statements: P210, P233, P241, P242, P264, P280, P302, P305, P313, P332, P337, P338, P352, P403
03 · Physical and chemical properties
Dichlorodimethylsilane properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 70.3 °C (158.5 °F) | HSDB | |
| 70 °C (158 °F) | at 760 mmHg | CAMEO | |
| 71 °C (159.8 °F) | ICSC | ||
| Melting point | -16 °C (3.2 °F) | HSDB | |
| -86.11 °C (-123 °F) | CAMEO | ||
| -76 °C (-104.8 °F) | ICSC | ||
| Density | 1.1 g/cm³ | CAMEO | |
| 1.07 g/cm³ | ICSC | ||
| 1.064 g/cm³ | at 25 °C | HSDB | |
| Solubility | Soluble in benzene and ether | HSDB | |
| Solubility in water: reaction | ICSC | ||
| Decomposes in water and ethanol | decomposes | HSDB | |
| Vapor pressure | 108.759 mmHg | at 20 °C | ICSC |
| 144 mmHg | at 25 °C | HSDB | |
| Flash point | -8.89 °C (16 °F) | HSDB | |
| -9 °C (15.8 °F) | ICSC | ||
| Autoignition temperature | 380 °C (716 °F) | HSDB | |
| 398.89 °C (750 °F) | CAMEO | ||
| Lower explosive limit (LEL) | 3.4 % by volume | HSDB | |
| 5.5 % by volume | HSDB | ||
| Upper explosive limit (UEL) | 9.5 % by volume | HSDB | |
| 10.4 % by volume | HSDB | ||
| Vapor density | 4.45 (air = 1) | HSDB | |
| 4.4 (air = 1) | ICSC | ||
| Corrosivity | Corrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Dichlorodimethylsilane
Storage conditions
SRP: Operations involving entry into tanks or closed vessels, and emergency situations, require consideration of potentially oxygen deficient, or "immediately dangerous to life and health" IDLH environments. This may necessitate use of a self-contained breathing apparatus (SCBA), or a positive pressure supplied air respirator.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
Violent reaction on contact with water.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
Chlorosilanes, such as DIMETHYLDICHLOROSILANE, are compounds in which silicon is bonded to from one to four chlorine atoms with other bonds to hydrogen and/or alkyl groups. Chlorosilanes react with water, moist air, or steam to produce heat and toxic, corrosive fumes of hydrogen chloride. They may also produce flammable gaseous H2. They can serve as chlorination agents. Chlorosilanes react vigorously with both organic and inorganic acids and with bases to generate toxic or flammable gases.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Dichlorodimethylsilane in the storage compatibility matrix →