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Silanes and silicones

Tetrapropoxysilane

Also known as Tetrapropyl orthosilicate, Silicic acid (H4SiO4), tetrapropyl ester, tetra-n-propyl silicate

CAS 682-01-9Formula C12H28O4SiMolar mass 264.44 g/molEC 211-659-0
GHS signal word: Warning. Pictograms: Harmful or irritant, Serious health hazard 13 suppliers listed
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Tetrapropoxysilane chemical structure, C12H28O4Si, CAS 682-01-9
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Liquid
Boiling point
94 °C
Density
0.913 @25 °C
HS code
292090
Category
Silanes and silicones
Illustrative photo, closed amber glass reagent bottles on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Tetrapropoxysilane?

Plain description, key identifiers and synonyms

Tetrapropoxysilane is a chemical substance with the molecular formula C12H28O4Si and a molar mass of 264.44 g/mol. Its CAS registry number is 682-01-9. The IUPAC name is tetrapropyl silicate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
tetrapropyl silicate
CAS number
682-01-9 CAS number cross-checked
EC number
211-659-0
Molecular formula
C12H28O4Si
UNII
4PE821G3GH
MDL number
MFCD00009364
InChIKey
ZQZCOBSUOFHDEE-UHFFFAOYSA-N
InChI
InChI=1S/C12H28O4Si/c1-5-9-13-17(14-10-6-2,15-11-7-3)16-12-8-4/h5-12H2,1-4H3
SMILES (canonical and isomeric)
CCCO[Si](OCCC)(OCCC)OCCC

Synonyms

  • Tetrapropyl orthosilicate
  • Silicic acid (H4SiO4), tetrapropyl ester
  • tetra-n-propyl silicate
  • Propyl silicate
  • tetra-n-Propyl orthosilicate
  • Tetrapropyloxysilane
  • Silicon orthopropoxide
  • Silicon tetrapropoxide
  • n-propyl orthosilicate
  • Silane, tetrapropoxy-
  • tetra-n-propoxy-silane
  • Propyl silicate ((PrO)4Si)
  • Zqzcobsuofhdee-uhfffaoysa-
  • Propyl orthosilicate
  • Propyl orthosilicate (II)
  • Tetranpropoxysilane
  • Tetrapropyl silicate
  • Tetra-n-propoxysilane
  • Dynasil P
  • Tetra-n-propoxysilane(Tetra propylorthosilicate)
  • tetrapropylorthosilicate
  • silicon tetra-n-propoxide
  • Si(OCH2CH2CH3)4
  • Si(O-n-C3H7)4
  • tetra-n-propyl ortho silicate
Show all 28 synonyms
  • Tetrapropyl orthosilicate, 95%
  • Tetrapropyl orthosilicate, >=98%, deposition grade
  • Tetrapropoxysilane, Tetra-n-propoxysilane, Tetrapropyl silicate, Propyl orthosilicate

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.
Boiling point
94 °Cexp.
Density
0.913 @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
264.44 g/molcalc.
Exact mass
264.1757 Dacalc.
LogP (octanol/water)
3.13calc.
Topological polar surface area
36.92 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
12calc.
Heavy atoms
17calc.
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
Warning
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H373May cause damage to organs through prolonged or repeated exposure.
Precautionary statements (17)
  • 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.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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

Tetrapropoxysilane suppliers

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

All 13 suppliers
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Where suppliers are based

13 suppliers in 4 countries

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Tetrapropoxysilane 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: Adhesion/cohesion promoter.

Functional uses

  • Viscosity modifier

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

Frequently asked questions

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

What is Tetrapropoxysilane?

Tetrapropoxysilane is a chemical substance with the molecular formula C12H28O4Si and a molar mass of 264.44 g/mol. Its CAS registry number is 682-01-9. The IUPAC name is tetrapropyl silicate.

What is the CAS number of Tetrapropoxysilane?

The CAS registry number of Tetrapropoxysilane is 682-01-9.

What is the molecular formula and weight of Tetrapropoxysilane?

The molecular formula of Tetrapropoxysilane is C12H28O4Si and its molar mass is 264.44 g/mol.

What is Tetrapropoxysilane used for?

Industrial uses: Adhesion/cohesion promoter.

Is Tetrapropoxysilane hazardous?

Tetrapropoxysilane carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Tetrapropoxysilane?

Tetrapropoxysilane 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 Tetrapropoxysilane?

CompoundList lists 13 suppliers of Tetrapropoxysilane in China, United States, United Kingdom 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 Tetrapropoxysilane?

Suppliers quote Tetrapropoxysilane 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 Tetrapropoxysilane

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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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