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.
02 · Identifiers
Dichlorodimethylsilane identifiers and molecular data
Dichlorodimethylsilane CAS number and EC number
Dichlorodimethylsilane molecular formula and molecular weight
Other names for Dichlorodimethylsilane
- dimethyldichlorosilane
03 · GHS classification
Dichlorodimethylsilane hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Dichlorodimethylsilane pictograms and signal word
Dichlorodimethylsilane hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Flammable liquids GHS chapter 2.6 | Category 2 | H225 | GHS02 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 2 | H315 | GHS07 |
| Serious eye damage/eye irritation GHS chapter 3.3 | Category 2A | H319 | GHS07 |
| Specific target organ toxicity - single exposure GHS chapter 3.8 | Category 3 | H335 | GHS07 |
Dichlorodimethylsilane hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H225 | Highly flammable liquid and vapour. |
| H335 | May cause respiratory irritation. |
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
This page lists only the codes assigned to Dichlorodimethylsilane. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Dichlorodimethylsilane
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Dichlorodimethylsilane issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Dichlorodimethylsilane precautionary statements
CLP Annex VI assigns 14 precautionary statements to Dichlorodimethylsilane. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Dichlorodimethylsilane name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | диметилдихлоросилан |
| Spanish español | Dimetildiclorosilano |
| Czech čeština | dichlordimethylsilan |
| Danish dansk | dichlordimethylsilan |
| German Deutsch | Dimethyldichlorsilan |
| Estonian eesti | dimetüüldiklorosilaan |
| Greek ελληνικά | διμεθυλοδιχλωροσιλάνιο |
| English English | dimethyldichlorosilane |
| French français | diméthyldichlorosilane |
| Croatian hrvatski | dimetildiklorsilan |
| Italian italiano | dimetildiclorosilano |
| Latvian latviešu | dimetildihlorosilāns |
| Lithuanian lietuvių | dimetildichlorsilanas |
| Hungarian magyar | dimetil-diklór-szilán |
| Maltese Malti | dimetildiklorosilan |
| Dutch Nederlands | dimethyldichloorsilaan |
| Polish polski | dichlorodimetylosilan |
| Portuguese português | dimetildiclorossilano |
| Romanian română | dimetildiclorosilan |
| Slovak slovenčina | dichlórdi(metyl)silán |
| Slovenian slovenščina | dikloro(dimetil)silan |
| Finnish suomi | dimetyylidikloorisilaani |
| Swedish svenska | dimetyldiklorsilan |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Dichlorodimethylsilane GHS label elements
Everything CLP Annex VI fixes for Dichlorodimethylsilane, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Dichlorodimethylsilane
- Highly flammable liquid and vapour.
- May cause respiratory irritation.
- Causes skin irritation.
- Causes serious eye irritation.
- Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- Keep container tightly closed.
- Use explosion-proof [electrical/ventilating/lighting/…] equipment.
- Use only non-sparking tools.
- Wash … thoroughly after handling.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF ON SKIN:
- IF IN EYES:
- Get medical advice/attention.
- If skin irritation occurs:
- If eye irritation persists:
- Remove contact lenses, if present and easy to do. Continue rinsing.
- Wash with plenty of water/…
- Store in a well-ventilated place.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Dichlorodimethylsilane in the GHS label constructor →
07 · Health hazards
Dichlorodimethylsilane health hazards and exposure limits
Dichlorodimethylsilane hazard summary
Evolves HCl when spilled in water; [ERG 2016] Capable of causing second and third degree burns to eyes and skin; A severe mucous membrane and respiratory tract irritant; [HSDB] A corrosive substance that can cause pulmonary edema; [ICSC] Reacts with water; A corrosive substance that can cause injury to the skin, eyes, and respiratory tract; Inhalation may cause chemical pneumonitis; [MSDSonline] In lethal concentration studies, causes labored breathing, corneal opacities, and lung damage; [AIHA]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · 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.
Dichlorodimethylsilane boiling point
| 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 |
Dichlorodimethylsilane melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | -16 °C (3.2 °F) | HSDB | |
| -86.11 °C (-123 °F) | CAMEO | ||
| -76 °C (-104.8 °F) | ICSC |
Dichlorodimethylsilane density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.1 g/cm³ | CAMEO | |
| 1.07 g/cm³ | ICSC | ||
| 1.064 g/cm³ | at 25 °C | HSDB |
Dichlorodimethylsilane solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Soluble in benzene and ether | HSDB | |
| Solubility in water: reaction | ICSC | ||
| Decomposes in water and ethanol | decomposes | HSDB |
Dichlorodimethylsilane vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 108.759 mmHg | at 20 °C | ICSC |
| 144 mmHg | at 25 °C | HSDB |
Dichlorodimethylsilane flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | -8.89 °C (16 °F) | HSDB | |
| -9 °C (15.8 °F) | ICSC |
Dichlorodimethylsilane autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | 380 °C (716 °F) | HSDB | |
| 398.89 °C (750 °F) | CAMEO |
Dichlorodimethylsilane lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | 3.4 % by volume | HSDB | |
| 5.5 % by volume | HSDB |
Dichlorodimethylsilane upper explosive limit (UEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Upper explosive limit (UEL) | 9.5 % by volume | HSDB | |
| 10.4 % by volume | HSDB |
Dichlorodimethylsilane vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 4.45 (air = 1) | HSDB | |
| 4.4 (air = 1) | ICSC |
Dichlorodimethylsilane corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | Corrosive | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Dichlorodimethylsilane fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Dichlorodimethylsilane fire potential
Flammable and corrosive liquid. Vapors are heavier than air and may travel to sources ognition and flash back. Combustion by-products include hydrogen chloride.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Dichlorodimethylsilane storage and handling
Dichlorodimethylsilane safe storage
Fireproof. Separated from incompatible materials. See Chemical Dangers. Cool. Dry. Keep under inert gas. Well closed.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
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)
Dichlorodimethylsilane incompatible materials
Violent reaction on contact with water.
Source: Hazardous Substances Data Bank (HSDB)
Dichlorodimethylsilane 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 →
11 · Questions
Dichlorodimethylsilane — frequently asked questions
What is the CAS number of Dichlorodimethylsilane?
The CAS number of Dichlorodimethylsilane is 75-78-5. Its EC number is 200-901-0.
What is the chemical formula of Dichlorodimethylsilane?
The molecular formula of Dichlorodimethylsilane is C2H6Cl2Si and its molecular weight is 129.06 g/mol.
What does a Dichlorodimethylsilane label have to show?
Under CLP Annex VI the label for Dichlorodimethylsilane carries the pictograms Flame and Exclamation mark and the signal word is Danger.
Is Dichlorodimethylsilane flammable?
Yes. CLP Annex VI assigns Dichlorodimethylsilane H225 — highly flammable liquid and vapour. The flash point reported for it is -8.89 °C (16 °F) (HSDB).
Is Dichlorodimethylsilane a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Dichlorodimethylsilane. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of Dichlorodimethylsilane?
The boiling point reported for Dichlorodimethylsilane is 70.3 °C (158.5 °F) (HSDB).
What is the melting point of Dichlorodimethylsilane?
The melting point reported for Dichlorodimethylsilane is -16 °C (3.2 °F) (HSDB).
How should Dichlorodimethylsilane be stored?
CLP Annex VI assigns Dichlorodimethylsilane the storage statement P403. 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. (Hazardous Substances Data Bank (HSDB))
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