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Silanes and silicones

Dimethyloctadecylsilane

Also known as n-octadecyldimethylsilane, Silane, dimethyloctadecyl-, octadecyl dimethyl silane

CAS 32395-58-7Formula C20H43SiMolar mass 311.65 g/molEC 624-294-0
GHS signal word: Warning. Pictograms: Harmful or irritant
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Dimethyloctadecylsilane chemical structure, C20H43Si, CAS 32395-58-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
32395-58-7
Formula
C20H43Si
Molar mass
311.65 g/mol
EC number
624-294-0
HS code
293190
Category
Silanes and silicones

What is Dimethyloctadecylsilane?

Plain description, key identifiers and synonyms

Dimethyloctadecylsilane is a chemical substance with the molecular formula C20H43Si and a molar mass of 311.65 g/mol. Its CAS registry number is 32395-58-7.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
32395-58-7 CAS number cross-checkedOther or deprecated CAS: 3295-58-7
EC numbers
624-294-0, 630-915-6
Molecular formula
C20H43Si
InChIKey
LFGMBVOAGOMKBY-UHFFFAOYSA-N
InChI
InChI=1S/C20H43Si/c1-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21(2)3/h4-20H2,1-3H3
SMILES (canonical and isomeric)
CCCCCCCCCCCCCCCCCC[Si](C)C

Synonyms

  • n-octadecyldimethylsilane
  • Silane, dimethyloctadecyl-
  • octadecyl dimethyl silane
  • Dimethyl(octadecyl)silane #
  • C20H43Si
  • Dimethyloctadecylsilane, 97%
  • Silane,dimethyloctadecyl, Dimethyloctadecylsilane,

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
311.65 g/molcalc.
Exact mass
311.3134 Dacalc.
LogP (octanol/water)
8calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
17calc.
Heavy atoms
21calc.
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
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • 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

Dimethyloctadecylsilane suppliers

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Dimethyloctadecylsilane 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Dimethyloctadecylsilane 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 Dimethyloctadecylsilane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Dimethyloctadecylsilane?

Dimethyloctadecylsilane is a chemical substance with the molecular formula C20H43Si and a molar mass of 311.65 g/mol. Its CAS registry number is 32395-58-7.

What is the CAS number of Dimethyloctadecylsilane?

The CAS registry number of Dimethyloctadecylsilane is 32395-58-7. Other or deprecated CAS numbers: 3295-58-7.

What is the molecular formula and weight of Dimethyloctadecylsilane?

The molecular formula of Dimethyloctadecylsilane is C20H43Si and its molar mass is 311.65 g/mol.

Is Dimethyloctadecylsilane hazardous?

Dimethyloctadecylsilane 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 Dimethyloctadecylsilane?

Dimethyloctadecylsilane 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 Dimethyloctadecylsilane?

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What is the price of Dimethyloctadecylsilane?

Suppliers quote Dimethyloctadecylsilane 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 Dimethyloctadecylsilane

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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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