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Silanes and silicones

Diethoxymethyloctadecylsilane

Also known as Methyloctadecyldiethoxysilane, Silane, diethoxymethyloctadecyl-, n-Octadecylmethyldiethoxysilane

CAS 67859-75-0Formula C23H50O2SiMolar mass 386.74 g/molEC 267-423-2
GHS signal word: Warning. Pictograms: Harmful or irritant
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Diethoxymethyloctadecylsilane chemical structure, C23H50O2Si, CAS 67859-75-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
67859-75-0
Formula
C23H50O2Si
Molar mass
386.74 g/mol
EC number
267-423-2
HS code
293190
Category
Silanes and silicones

What is Diethoxymethyloctadecylsilane?

Plain description, key identifiers and synonyms

Diethoxymethyloctadecylsilane is a chemical substance with the molecular formula C23H50O2Si and a molar mass of 386.74 g/mol. Its CAS registry number is 67859-75-0. The IUPAC name is diethoxy-methyl-octadecylsilane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
diethoxy-methyl-octadecylsilane
CAS number
67859-75-0 CAS number cross-checked
EC number
267-423-2
Molecular formula
C23H50O2Si
UNII
6MWP7CXD5B
MDL number
MFCD00026674
InChIKey
DJVQMRRXRRBRIH-UHFFFAOYSA-N
InChI
InChI=1S/C23H50O2Si/c1-5-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-23-26(4,24-6-2)25-7-3/h5-23H2,1-4H3
SMILES (canonical and isomeric)
CCCCCCCCCCCCCCCCCC[Si](C)(OCC)OCC

Synonyms

  • Methyloctadecyldiethoxysilane
  • Silane, diethoxymethyloctadecyl-
  • n-Octadecylmethyldiethoxysilane
  • diethoxy(methyl)(octadecyl)silane
  • diethoxy-methyl-octadecylsilane
  • C23H50O2Si
  • methyloctadecyl-diethoxysilane
  • diethoxy-methyl-octadecyl-silane
  • Diethoxy(methyl)octadecylsilane #
  • n-Octadecylmethyldiethoxysilane>92% n isomer

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
386.74 g/molcalc.
Exact mass
386.358 Dacalc.
LogP (octanol/water)
8.39calc.
Topological polar surface area
18.46 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
21calc.
Heavy atoms
26calc.
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

Diethoxymethyloctadecylsilane suppliers

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Diethoxymethyloctadecylsilane price

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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

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

Frequently asked questions

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

What is Diethoxymethyloctadecylsilane?

Diethoxymethyloctadecylsilane is a chemical substance with the molecular formula C23H50O2Si and a molar mass of 386.74 g/mol. Its CAS registry number is 67859-75-0. The IUPAC name is diethoxy-methyl-octadecylsilane.

What is the CAS number of Diethoxymethyloctadecylsilane?

The CAS registry number of Diethoxymethyloctadecylsilane is 67859-75-0.

What is the molecular formula and weight of Diethoxymethyloctadecylsilane?

The molecular formula of Diethoxymethyloctadecylsilane is C23H50O2Si and its molar mass is 386.74 g/mol.

Is Diethoxymethyloctadecylsilane hazardous?

Diethoxymethyloctadecylsilane 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 Diethoxymethyloctadecylsilane?

Diethoxymethyloctadecylsilane 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 Diethoxymethyloctadecylsilane?

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What is the price of Diethoxymethyloctadecylsilane?

Suppliers quote Diethoxymethyloctadecylsilane 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 Diethoxymethyloctadecylsilane

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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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