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Chlorides and other halides

Dichlorosilane

Also known as diclorosilano, SiH2Cl2, Dichlorosilane (UN2189) (Poison gas)

CAS 4109-96-0Formula H2Cl2SiMolar mass 101.01 g/molEC 223-888-3
GHS signal word: Danger. Pictograms: Flammable, Gas under pressure, Corrosive, Acute toxicity (severe) 7 suppliers listed
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Dichlorosilane chemical structure, H2Cl2Si, CAS 4109-96-0
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Gas
Melting point
-122 °C
Boiling point
8 °C
Flash point
-28 °C
Solubility
Solubility in water: reaction
HS code
281219
Category
Chlorides and other halides
UN number
UN 2189
Illustrative photo, a bundle of gas cylinders on a manifold in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Dichlorosilane?

Plain description, key identifiers and synonyms

Dichlorosilane is a flammable and poisonous gas, with a strong repulsive odor. It is easily ignited in air, reacts with oxidizing agents, is very toxic by inhalation, and is a strong irritant to skin, eyes and mucous membranes. Under prolonged exposure to fire or intense heat the container may rupture violently or rocket.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dichlorosilane
CAS number
4109-96-0 CAS number cross-checked
EC number
223-888-3
Molecular formula
H2Cl2Si
InChIKey
MROCJMGDEKINLD-UHFFFAOYSA-N
InChI
InChI=1S/Cl2H2Si/c1-3-2/h3H2
SMILES (canonical and isomeric)
[SiH2](Cl)Cl

Synonyms

  • diclorosilano
  • SiH2Cl2
  • Dichlorosilane (UN2189) (Poison gas)
  • Dichlorosilane(SiH2Cl2)
  • Dichlorosilane, >=99.99% trace metals basis
  • Silane, dichloro-
  • Silicon chloride hydride (SiH2Cl2)
  • dichiorosilane
  • Cl2H2Si

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
Gasexp.
Melting point
-122 °Cexp.
Boiling point
8 °Cexp.
Flash point
-28 °Cexp.
Solubility
Solubility in water: reactionexp.
Vapour pressure
Vapor pressure, kPa at 20 °C: 163.6exp.

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
101.01 g/molcalc.
Exact mass
99.9303 Dacalc.
LogP (octanol/water)
0.46calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

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
GHS04: Gas under pressure
Gas under pressure
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H220Extremely flammable gas.
  • H261In contact with water releases flammable gas.
  • H280Contains gas under pressure, may explode if heated.
  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
  • H330Fatal if inhaled.
  • H331Toxic if inhaled.
Precautionary statements (29)
  • P203Obtain, read and follow all safety instructions before use.
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P222Do not allow contact with air.
  • P231 + P232Handle and store contents under inert gas. Protect from moisture.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • 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.
  • P284In case of inadequate ventilation wear respiratory 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.
  • 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.
  • P317Get medical help.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • 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.
  • P377Leaking gas fire: do not extinguish, unless leak can be stopped safely.
  • P381In case of leakage, eliminate all ignition sources.
  • P402 + P404Store in a dry place. Store in a closed container.
  • P403Store in a well-ventilated place.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P410 + P403Protect from sunlight. Store in a well-ventilated place.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2189
Transport hazard class
2.3

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

Dichlorosilane suppliers

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

All 7 suppliers
7 of 7 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

7 suppliers in 2 countries

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Dichlorosilane 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

Industrial uses: Semiconductor and photovoltaic agent, Intermediate.

Consumer uses: Semiconductor and photovoltaic agent.

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 Dichlorosilane is traded under.

HS 2812.19Indicative HS code

Chlorides and chloride oxides, other

World exports in 2024
$159M
+15.9% vs 2023, imports $156M
2019 to 2024
Top exporters
  1. South Korea32.7%
  2. Japan21.7%
  3. Germany16.4%
Top importers
  1. China27.8%
  2. Singapore21.4%
  3. South Korea19.0%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Dichlorosilane?

Dichlorosilane is a flammable and poisonous gas, with a strong repulsive odor. It is easily ignited in air, reacts with oxidizing agents, is very toxic by inhalation, and is a strong irritant to skin, eyes and mucous membranes.

What is the CAS number of Dichlorosilane?

The CAS registry number of Dichlorosilane is 4109-96-0.

What is the molecular formula and weight of Dichlorosilane?

The molecular formula of Dichlorosilane is H2Cl2Si and its molar mass is 101.01 g/mol.

What is Dichlorosilane used for?

Industrial uses: Semiconductor and photovoltaic agent, Intermediate. Consumer uses: Semiconductor and photovoltaic agent.

Is Dichlorosilane hazardous?

Dichlorosilane carries the GHS signal word "Danger". Main hazards: extremely flammable gas, in contact with water releases flammable gas, contains gas under pressure, may explode if heated. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Dichlorosilane?

Dichlorosilane is usually classified under HS code 281219 (Chlorides and chloride oxides, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Dichlorosilane?

CompoundList lists 7 suppliers of Dichlorosilane in United States and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Dichlorosilane?

Suppliers quote Dichlorosilane 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 Dichlorosilane

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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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