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Silanes and silicones

Methylethyldichlorosilane

Also known as Ethylmethyldichlorosilane, Dichloroethylmethylsilane, Dichloro(ethyl)methylsilane

CAS 4525-44-4Formula C3H8Cl2SiMolar mass 143.09 g/molEC 224-860-3
GHS signal word: Danger. Pictograms: Flammable, Corrosive
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Methylethyldichlorosilane chemical structure, C3H8Cl2Si, CAS 4525-44-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
4525-44-4
Formula
C3H8Cl2Si
Molar mass
143.09 g/mol
Physical form
Liquid
HS code
293190
Category
Silanes and silicones
Illustrative photo, closed blue steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Methylethyldichlorosilane?

Plain description, key identifiers and synonyms

Methylethyldichlorosilane is a chemical substance with the molecular formula C3H8Cl2Si and a molar mass of 143.09 g/mol. Its CAS registry number is 4525-44-4. The IUPAC name is dichloro-ethyl-methylsilane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dichloro-ethyl-methylsilane
CAS number
4525-44-4 CAS number cross-checked
EC number
224-860-3
Molecular formula
C3H8Cl2Si
UNII
47ROB570JW
MDL number
MFCD00013607
InChIKey
PNECSTWRDNQOLT-UHFFFAOYSA-N
InChI
InChI=1S/C3H8Cl2Si/c1-3-6(2,4)5/h3H2,1-2H3
SMILES (canonical and isomeric)
CC[Si](C)(Cl)Cl

Synonyms

  • Ethylmethyldichlorosilane
  • Dichloroethylmethylsilane
  • Dichloro(ethyl)methylsilane
  • dichloro-ethyl-methylsilane
  • Silane, dichloroethylmethyl-
  • dichloro-ethyl-methyl-silane
  • Dichloro(ethyl)(methyl)silane
  • Dichloro(ethyl)methylsilane, >=97.0% (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

Physical form
Liquidexp.

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
143.09 g/molcalc.
Exact mass
141.9772 Dacalc.
LogP (octanol/water)
2.56calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
6calc.
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

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H314Causes severe skin burns and eye damage.
Precautionary statements (21)
  • 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.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • 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).
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Methylethyldichlorosilane suppliers

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Methylethyldichlorosilane 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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

Frequently asked questions

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

What is Methylethyldichlorosilane?

Methylethyldichlorosilane is a chemical substance with the molecular formula C3H8Cl2Si and a molar mass of 143.09 g/mol. Its CAS registry number is 4525-44-4. The IUPAC name is dichloro-ethyl-methylsilane.

What is the CAS number of Methylethyldichlorosilane?

The CAS registry number of Methylethyldichlorosilane is 4525-44-4.

What is the molecular formula and weight of Methylethyldichlorosilane?

The molecular formula of Methylethyldichlorosilane is C3H8Cl2Si and its molar mass is 143.09 g/mol.

Is Methylethyldichlorosilane hazardous?

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

What is the HS code of Methylethyldichlorosilane?

Methylethyldichlorosilane 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 Methylethyldichlorosilane?

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What is the price of Methylethyldichlorosilane?

Suppliers quote Methylethyldichlorosilane 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 Methylethyldichlorosilane

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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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