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Silanes and silicones

Triethoxysilane

Also known as Silane, triethoxy-, SIT 8185, hydridotriethoxysilane

CAS 998-30-1Formula C6H16O3SiMolar mass 164.28 g/molEC 213-650-7
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe), Harmful or irritant 14 suppliers listed
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Triethoxysilane chemical structure, C6H16O3Si, CAS 998-30-1
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Liquid
Melting point
-170 °C
Boiling point
133.5 °C
Density
0.87 g/cm³
Flash point
26 °C
HS code
292090
Category
Silanes and silicones
UN number
UN 3384
Illustrative photo, 25 litre white jerry cans of liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Triethoxysilane?

Plain description, key identifiers and synonyms

Triethoxysilane is a liquid. Used as a reducing agent.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
triethoxysilane
CAS number
998-30-1 CAS number cross-checkedOther or deprecated CAS: 171773-83-4
EC number
213-650-7
Molecular formula
C6H16O3Si
InChIKey
QQQSFSZALRVCSZ-UHFFFAOYSA-N
InChI
InChI=1S/C6H16O3Si/c1-4-7-10(8-5-2)9-6-3/h10H,4-6H2,1-3H3
SMILES (canonical and isomeric)
CCO[SiH](OCC)OCC

Synonyms

  • Silane, triethoxy-
  • SIT 8185
  • hydridotriethoxysilane
  • HSi(OEt)3
  • Si(OEt)3H
  • Triethoxisilane
  • triethoxy silane
  • triethoxy-silane
  • TRIES
  • Triethoxysilane, 95%
  • (EtO)3SiH
  • Qqqsfszalrvcsz-uhfffaoysa-

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.
Melting point
-170 °Cexp.
Boiling point
133.5 °Cexp.
Density
0.87 g/cm³exp.
Flash point
26 °Cexp.
Vapour pressure
8.5 [mm Hg] @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
164.28 g/molcalc.
Exact mass
164.0869 Dacalc.
LogP (octanol/water)
0.81calc.
Topological polar surface area
27.69 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
6calc.
Heavy atoms
10calc.
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)
GHS07: Harmful or irritant
Harmful or irritant
340NFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H252Self-heating in large quantities, may catch fire.
  • H260In contact with water releases flammable gases which may ignite spontaneously.
  • H302Harmful if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H330Fatal if inhaled.
Precautionary statements (42)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P223Do not allow contact with water.
  • P231 + P232Handle and store contents under inert gas. Protect from moisture.
  • P233Keep container tightly closed.
  • P235Keep cool.
  • 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.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • 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.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P335 + P334If on skin: Brush off loose particles from skin. Immerse in cool water or wrap in wet bandages.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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.
  • 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).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • 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.
  • P407Maintain air gap between stacks or pallets.
  • P410Protect from sunlight.
  • P413Store bulk masses at temperatures not exceeding the specified limit.
  • P420Store separately.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3384
Transport hazard class
6.1
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

Triethoxysilane suppliers

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

All 14 suppliers
14 of 14 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

14 suppliers in 3 countries

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Triethoxysilane 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

Is of commercial importance in the silane and silicone industry for the production of organofunctional coupling agents, low-temperature-vulcanizing (LTV) silicone rubbers and elastomers, and specialty monomers.

Used to prepare a number of organic coupling agents utilized by the plastics industry as adhesion promoters.

Industrial uses: Intermediate.

How it is made

Reaction of silicon with ethanol ... produces triethoxysilane ... with cuprous chloride as the catalyst...

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 Triethoxysilane is traded under.

HS 2920.90Indicative HS code

Esters, other than thiophosphoric esters (phosphorothioates) and phosphite esters and their salts…

World exports in 2024
$1.05B
+8.0% vs 2023, imports $1.23B
2019 to 2024
Top exporters
  1. China33.4%
  2. Germany18.8%
  3. United States12.4%
Top importers
  1. United States19.2%
  2. Singapore8.9%
  3. South Korea6.9%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Triethoxysilane?

Triethoxysilane is a liquid. Used as a reducing agent.

What is the CAS number of Triethoxysilane?

The CAS registry number of Triethoxysilane is 998-30-1. Other or deprecated CAS numbers: 171773-83-4.

What is the molecular formula and weight of Triethoxysilane?

The molecular formula of Triethoxysilane is C6H16O3Si and its molar mass is 164.28 g/mol.

What is Triethoxysilane used for?

Is of commercial importance in the silane and silicone industry for the production of organofunctional coupling agents, low-temperature-vulcanizing (LTV) silicone rubbers and elastomers, and specialty monomers. Used to prepare a number of organic coupling agents utilized by the plastics industry as adhesion promoters.

Is Triethoxysilane hazardous?

Triethoxysilane carries the GHS signal word "Danger". Main hazards: flammable liquid and vapour, self-heating in large quantities, may catch fire, in contact with water releases flammable gases which may ignite spontaneously. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Triethoxysilane?

Triethoxysilane is usually classified under HS code 292090 (Esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Triethoxysilane?

CompoundList lists 14 suppliers of Triethoxysilane in China, United States and Netherlands. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Triethoxysilane?

Suppliers quote Triethoxysilane 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 Triethoxysilane

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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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