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Silanes and silicones

Trimethylsilane

Also known as (CH3)3SiH, 2-Methyl-2-silapropane, Silane, trimethyl-

CAS 993-07-7Formula C3H10SiMolar mass 74.20 g/molEC 213-603-0
GHS signal word: Danger. Pictograms: Flammable, Gas under pressure, Harmful or irritant 16 suppliers listed
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Trimethylsilane chemical structure, C3H10Si, CAS 993-07-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
993-07-7
Formula
C3H10Si
Molar mass
74.20 g/mol
Physical form
Gas
HS code
293190
Category
Silanes and silicones
Illustrative photo, industrial gas cylinders secured with a safety chain in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Trimethylsilane?

Plain description, key identifiers and synonyms

Trimethylsilane is a chemical substance with the molecular formula C3H10Si and a molar mass of 74.20 g/mol. Its CAS registry number is 993-07-7.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
trimethylsilane
CAS number
993-07-7Other or deprecated CAS: 110477-51-5
EC number
213-603-0
Molecular formula
C3H10Si
InChIKey
PQDJYEQOELDLCP-UHFFFAOYSA-N
InChI
InChI=1S/C3H10Si/c1-4(2)3/h4H,1-3H3
SMILES (canonical and isomeric)
C[SiH](C)C

Synonyms

  • (CH3)3SiH
  • 2-Methyl-2-silapropane
  • Silane, trimethyl-
  • Trimethysilane
  • trimethyl silane
  • (trimethyl)silane
  • TMSH
  • Trimethylsilyl hydride
  • C3H10Si

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.

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
74.20 g/molcalc.
Exact mass
74.0552 Dacalc.
LogP (octanol/water)
1.1calc.
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
GHS04: Gas under pressure
Gas under pressure
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H220Extremely flammable gas.
  • H224Extremely flammable liquid and vapour.
  • H280Contains gas under pressure, may explode if heated.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (31)
  • 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.
  • 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.
  • P377Leaking gas fire: do not extinguish, unless leak can be stopped safely.
  • P381In case of leakage, eliminate all ignition sources.
  • P403Store in a well-ventilated place.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P410 + P403Protect from sunlight. Store in a well-ventilated place.
  • 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

Trimethylsilane suppliers

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

All 16 suppliers
16 of 16 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

16 suppliers in 8 countries

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Trimethylsilane price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Industrial uses: Intermediate.

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

Frequently asked questions

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

What is Trimethylsilane?

Trimethylsilane is a chemical substance with the molecular formula C3H10Si and a molar mass of 74.20 g/mol. Its CAS registry number is 993-07-7.

What is the CAS number of Trimethylsilane?

The CAS registry number of Trimethylsilane is 993-07-7. Other or deprecated CAS numbers: 110477-51-5.

What is the molecular formula and weight of Trimethylsilane?

The molecular formula of Trimethylsilane is C3H10Si and its molar mass is 74.20 g/mol.

What is Trimethylsilane used for?

Industrial uses: Intermediate.

Is Trimethylsilane hazardous?

Trimethylsilane carries the GHS signal word "Danger". Main hazards: extremely flammable gas, extremely flammable liquid and vapour, 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 Trimethylsilane?

Trimethylsilane 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 Trimethylsilane?

CompoundList lists 16 suppliers of Trimethylsilane in United States, China, Indonesia, Bangladesh and 4 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 Trimethylsilane?

Suppliers quote Trimethylsilane 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 Trimethylsilane

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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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