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Silanes and silicones

Trichlorooctadecylsilane

Also known as Octadecyltrichlorosilane, n-Octadecyltrichlorosilane, Silane, trichlorooctadecyl-

CAS 112-04-9Formula C18H37Cl3SiMolar mass 387.94 g/molEC 203-930-7
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 13 suppliers listed
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Trichlorooctadecylsilane chemical structure, C18H37Cl3Si, CAS 112-04-9
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Water-white liquid
Melting point
Ca. 20
Boiling point
380 °C
Density
0.984 g/cm³ at 25 °C
Flash point
89 °C
HS code
293190
Category
Silanes and silicones
UN number
UN 1800
Illustrative photo, clear colourless liquid in a glass reagent bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Trichlorooctadecylsilane?

Plain description, key identifiers and synonyms

Octadecyltrichlorosilane appears as a colorless liquid with a pungent odor. Decomposed by water to hydrochloric acid with the evolution of heat. Corrosive to metals and tissue. Used to make various silicon containing compounds.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
trichloro(octadecyl)silane
CAS number
112-04-9 CAS number cross-checkedOther or deprecated CAS: 33520-90-0
EC number
203-930-7
Molecular formula
C18H37Cl3Si
UNII
1QLE771PKE
MDL number
MFCD00000484
InChIKey
PYJJCSYBSYXGQQ-UHFFFAOYSA-N
InChI
InChI=1S/C18H37Cl3Si/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-22(19,20)21/h2-18H2,1H3
SMILES (canonical and isomeric)
CCCCCCCCCCCCCCCCCC[Si](Cl)(Cl)Cl

Synonyms

  • Octadecyltrichlorosilane
  • n-Octadecyltrichlorosilane
  • Silane, trichlorooctadecyl-
  • Stearyltrichlorosilane
  • octadecyl trichlorosilane
  • n-OTS
  • Trichloro(octadecyl)silane
  • Trichlorostearylsilane
  • Silane, octadecyltrichloro-
  • Trichloro octadecyl silane
  • Trichloroctadecylsilane
  • n-Octadecyltrichlorosilane (>90%)
  • Trichlorooctadecylsilane (>99.0%)
  • C18H37Cl3Si
  • ghl.PD_Mitscher_leg0.1312
  • Trichloro(octadecyl)silane, >=90%
  • UN 1800
  • Octadecyltrichlorosilane [UN1800] [Corrosive]
  • Octadecyltrichlorosilane, Trichloro(stearyl)silane

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

Appearance
Water-white liquidexp.
Melting point
Ca. 20exp.
Boiling point
380 °Cexp.
Density
0.984 g/cm³ at 25 °Cexp.
Flash point
89 °Cexp.
Solubility
Soluble in benzene, ethyl ether, heptane, and perchloroethyleneexp.

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
387.94 g/molcalc.
Exact mass
386.173 Dacalc.
LogP (octanol/water)
8.9calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
17calc.
Heavy atoms
22calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (1 violation)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
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
232NFPA 704 rating

Hazard statements

  • H314Causes severe skin burns and eye damage.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P271Use only outdoors or in a well-ventilated area.
  • 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.
  • 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.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing 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.
UN number
UN 1800
Transport hazard class
8
Packing group
II

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

Trichlorooctadecylsilane suppliers

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All 13 suppliers
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Where suppliers are based

13 suppliers in 5 countries

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Trichlorooctadecylsilane 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

Intermediate for silicones.

Functional uses

  • Adhesion/cohesion promoter
  • Surface modifier
  • Waterproofing agent
  • Wetting agent (non-aqueous)

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

Frequently asked questions

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

What is Trichlorooctadecylsilane?

Octadecyltrichlorosilane appears as a colorless liquid with a pungent odor. Decomposed by water to hydrochloric acid with the evolution of heat. Corrosive to metals and tissue. Used to make various silicon containing compounds.

What is the CAS number of Trichlorooctadecylsilane?

The CAS registry number of Trichlorooctadecylsilane is 112-04-9. Other or deprecated CAS numbers: 33520-90-0.

What is the molecular formula and weight of Trichlorooctadecylsilane?

The molecular formula of Trichlorooctadecylsilane is C18H37Cl3Si and its molar mass is 387.94 g/mol.

What is Trichlorooctadecylsilane used for?

Intermediate for silicones.

Is Trichlorooctadecylsilane hazardous?

Trichlorooctadecylsilane carries the GHS signal word "Danger". Main hazards: causes severe skin burns and eye damage, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Trichlorooctadecylsilane?

Trichlorooctadecylsilane 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 Trichlorooctadecylsilane?

CompoundList lists 13 suppliers of Trichlorooctadecylsilane in China, United States, Germany, United Kingdom and 1 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 Trichlorooctadecylsilane?

Suppliers quote Trichlorooctadecylsilane 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 Trichlorooctadecylsilane

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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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