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Silanes and silicones

Dichlorodimethylsilane

Also known as Dimethyldichlorosilane, Silane, dichlorodimethyl-, Dichlorodimethylsilicon

CAS 75-78-5Formula C2H6Cl2SiMolar mass 129.06 g/molEC 200-901-0
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant 20 suppliers listed
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Dichlorodimethylsilane chemical structure, C2H6Cl2Si, CAS 75-78-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Melting point
-16 °C
Boiling point
70.3 °C
Density
1.064 g/cm³ at 25 °C
Flash point
-18 °C
HS code
293190
Category
Silanes and silicones
UN number
UN 1162
Illustrative photo, clear liquid in a volumetric flask on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Dichlorodimethylsilane?

Plain description, key identifiers and synonyms

Dimethyldichlorosilane appears as a colorless fuming liquid with a pungent odor. Flash point 16 °F. Vapor and liquid may cause burns. Denser than water. Vapors heavier than air.

Dichlorodimethylsilane is an organosilicon compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dichloro(dimethyl)silane
CAS number
75-78-5 CAS number cross-checked
EC number
200-901-0
Molecular formula
C2H6Cl2Si
UNII
8TSJ92JX69
MDL number
MFCD00000491
InChIKey
LIKFHECYJZWXFJ-UHFFFAOYSA-N
InChI
InChI=1S/C2H6Cl2Si/c1-5(2,3)4/h1-2H3
SMILES (canonical and isomeric)
C[Si](C)(Cl)Cl

Synonyms

  • Dimethyldichlorosilane
  • Silane, dichlorodimethyl-
  • Dichlorodimethylsilicon
  • Inerton AW-DMCS
  • Dimethyl-dichlorsilan
  • Inerton dw-dmc
  • Dimethylsilane dichloride
  • LS 130
  • DMDCS
  • Dichloro(dimethyl)silane
  • (CH3)2SiCl2
  • Repel-Silan
  • DMDCS, Dimethyldichlorsilane
  • dimethyl dichlorosilane
  • dichlorodimehylsilane
  • dimethyldichlorosilan
  • Dimethyldichlorsilane
  • dimethyidichlorosilane
  • Me2SiCl2
  • SiMe2Cl2
  • dichloro dimethylsilane
  • dichlorodimethyl silane
  • dimethyldichloro silane
  • dimethylsilyl dichloride
  • Dichloro-dimethyl-silane
Show all 36 synonyms
  • Dichlorodi(methyl)silane
  • Silane, dichlorodimethyl-,
  • 4-04-00-04111 (Beilstein Handbook Reference)
  • Dichlorodimethylsilane, >=99.5%
  • UN 1162
  • Dichlorodimethylsilane, Selectophore(TM)
  • Dichlorodimethylsilane, >=98.5% (GC)
  • Dimethyldichlorosilane [UN1162] [Flammable liquid]
  • Dichlorodimethylsilane solution 5% (wt/wt) in toluene (+/- 0.5%)
  • Dichlorodimethylsilane solution 5% (wt/wt) in n-heptane (+/- 0.5%)
  • Dichlorodimethylsilane, produced by Wacker Chemie AG, Burghausen, Germany, >=99.0% (GC)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless liquidexp.
Odour
SHARP, LIKE HYDROCHLORIC ACIDexp.
Melting point
-16 °Cexp.
Boiling point
70.3 °Cexp.
Density
1.064 g/cm³ at 25 °Cexp.
Flash point
-18 °Cexp.
Autoignition temperature
380 °Cexp.
Solubility
Decomposes in water and ethanolexp.
Vapour pressure
144 mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
129.06 g/molcalc.
Exact mass
127.9616 Dacalc.
LogP (octanol/water)
2.17calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
331NFPA 704 rating

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (25)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1162
Transport hazard class
3
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Dichlorodimethylsilane suppliers

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Where suppliers are based

20 suppliers in 7 countries

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Dichlorodimethylsilane price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Intermediate for silicone products.

High-purity derivatization reagent for gas chromatography.

Production of linear siloxane polymers, silicone fluids, rubbers, elastomers.

Silicone resins, e.g. phenyl- and methyl trichlorosilane, methylphenyldichlorosilane, and dimethyldichlorosilane, are utilized by the paint industry to provide excellent water repellency and resistance to weathering, UV radiation, and thermal cycling. Silicone-resin-based paints are used in extreme environments such as boiler stacks, exhausts, ovens, furnaces, heat exchangers, hot plates, grills, air-conditioning units, and jet engines.

Industrial uses: Monomers, Intermediate.

How it is made

Action of silicon on methyl chloride in presence of copper catalyst, or by Grignard reaction from methyl chloride and silicon tetrachloride.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 014-003-00-X

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Dichlorodimethylsilane is traded under.

HS 2931.90Indicative HS code

Organo-inorganic compounds, other than tetramethyl lead, tetraethyl lead, tributyltin compounds…

World exports in 2024
$3.97B
+5.3% vs 2023, imports $3.93B
2019 to 2024
Top exporters
  1. China28.3%
  2. United States15.6%
  3. Germany15.1%
Top importers
  1. United States14.6%
  2. China13.0%
  3. South Korea8.5%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Dichlorodimethylsilane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Dichlorodimethylsilane, based on the data on this page

What is Dichlorodimethylsilane?

Dimethyldichlorosilane appears as a colorless fuming liquid with a pungent odor. Flash point 16 °F. Vapor and liquid may cause burns. Denser than water. Vapors heavier than air.

What is the CAS number of Dichlorodimethylsilane?

The CAS registry number of Dichlorodimethylsilane is 75-78-5.

What is the molecular formula and weight of Dichlorodimethylsilane?

The molecular formula of Dichlorodimethylsilane is C2H6Cl2Si and its molar mass is 129.06 g/mol.

What is Dichlorodimethylsilane used for?

Intermediate for silicone products. High-purity derivatization reagent for gas chromatography. Production of linear siloxane polymers, silicone fluids, rubbers, elastomers. Silicone resins, e.g.

Is Dichlorodimethylsilane hazardous?

Dichlorodimethylsilane carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Dichlorodimethylsilane?

Dichlorodimethylsilane is usually classified under HS code 293190 (X. ORGANO-INORGANIC COMPOUNDS, HETEROCYCLIC COMPOUNDS, NUCLEIC ACIDS AND THEIR SALTS…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Dichlorodimethylsilane?

CompoundList lists 20 suppliers of Dichlorodimethylsilane in China, United States, Canada, Germany and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Dichlorodimethylsilane?

Suppliers quote Dichlorodimethylsilane on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Dichlorodimethylsilane

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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