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Silanes and silicones

Methyldichlorosilane

Also known as Methyl-dichlorsilan, Dichlorohydridomethylsilicon, Dichloromethylsilane

CAS 75-54-7Formula CH4Cl2SiMolar mass 115.04 g/molEC 200-877-1
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe) 11 suppliers listed
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Methyldichlorosilane chemical structure, CH4Cl2Si, CAS 75-54-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Melting point
-93 °C
Boiling point
41 °C
Density
Relative density (water = 1): 1.1
Flash point
-9 °C
HS code
293190
Category
Silanes and silicones
UN number
UN 1242
Illustrative photo, an amber glass solvent bottle with clear liquid on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Methyldichlorosilane?

Plain description, key identifiers and synonyms

Methyldichlorosilane appears as a colorless fuming liquid with a pungent odor. Flash point: -26 °F, Boiling point: 41 °C (106 °F). Vapors heavier than air. Vapor and liquid may cause burns. Denser than water and decomposed by water to form hydrochloric acid, a corrosive material.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dichloro(methyl)silane
CAS number
75-54-7 CAS number cross-checkedOther or deprecated CAS: 99936-08-0
EC number
200-877-1
Molecular formula
CH4Cl2Si
InChIKey
NWKBSEBOBPHMKL-UHFFFAOYSA-N
InChI
InChI=1S/CH4Cl2Si/c1-4(2)3/h4H,1H3
SMILES (canonical and isomeric)
C[SiH](Cl)Cl

Synonyms

  • Methyl-dichlorsilan
  • Dichlorohydridomethylsilicon
  • Dichloromethylsilane
  • Methyl dichlorosilane
  • Monomethyldichlorosilane
  • Silane, dichloromethyl-
  • methyldichorosilane
  • Methyldichlorosilan
  • HSiMeCl2
  • MeSiHCl2
  • Methyl(dichloro)silane
  • CH4Cl2Si
  • Silane, methyldichloro-
  • UN 1242

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
ACRID ODORexp.
Melting point
-93 °Cexp.
Boiling point
41 °Cexp.
Density
Relative density (water = 1): 1.1exp.
Flash point
-9 °Cexp.
Autoignition temperature
>316exp.
Solubility
SOL IN WATERexp.
Vapour pressure
429 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
115.04 g/molcalc.
Exact mass
113.9459 Dacalc.
LogP (octanol/water)
1.31calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
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
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
342WNFPA 704 rating

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H261In contact with water releases flammable gas.
  • H301Toxic if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H331Toxic if inhaled.
Precautionary statements (29)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P231 + P232Handle and store contents under inert gas. Protect from moisture.
  • 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.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • 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 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P402 + P404Store in a dry place. Store in a closed container.
  • 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 1242
Transport hazard class
4.3
Packing group
I

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

Methyldichlorosilane suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 11 suppliers
11 of 11 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

11 suppliers in 3 countries

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Methyldichlorosilane 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

Monomer for silicone fluids.

Manufacture of siloxanes.

The organohydrosilane of greatest commercial importance is methyldichlorosilane. Careful hydrolysis of this material with water affords polymethyhydrosiloxanes, primarily used in the textile industry to waterproof and improve the wear resistance of fabrics.

Industrial uses: Intermediate, Monomers.

How it is made

Reaction of methyl chloride with silicon and copper.

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Methyldichlorosilane 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 Methyldichlorosilane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Methyldichlorosilane?

Methyldichlorosilane appears as a colorless fuming liquid with a pungent odor. Flash point: -26 °F, Boiling point: 41 °C (106 °F). Vapors heavier than air. Vapor and liquid may cause burns. Denser than water and decomposed by water to form hydrochloric acid, a corrosive material.

What is the CAS number of Methyldichlorosilane?

The CAS registry number of Methyldichlorosilane is 75-54-7. Other or deprecated CAS numbers: 99936-08-0.

What is the molecular formula and weight of Methyldichlorosilane?

The molecular formula of Methyldichlorosilane is CH4Cl2Si and its molar mass is 115.04 g/mol.

What is Methyldichlorosilane used for?

Monomer for silicone fluids. Manufacture of siloxanes. The organohydrosilane of greatest commercial importance is methyldichlorosilane. Careful hydrolysis of this material with water affords polymethyhydrosiloxanes, primarily used in the textile industry to waterproof and improve the wear resistance of fabrics.

Is Methyldichlorosilane hazardous?

Methyldichlorosilane carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, in contact with water releases flammable gas, toxic if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Methyldichlorosilane?

Methyldichlorosilane 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 Methyldichlorosilane?

CompoundList lists 11 suppliers of Methyldichlorosilane in China, United States and Pakistan. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Methyldichlorosilane?

Suppliers quote Methyldichlorosilane 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 Methyldichlorosilane

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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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