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Silanes and silicones

Hexamethoxydisilane

Also known as Disilane, hexamethoxy-, trimethoxy(trimethoxysilyl)silane, Hexamethoxydisilan

CAS 5851-07-0Formula C6H18O6Si2Molar mass 242.38 g/molEC 801-834-5
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe)
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Hexamethoxydisilane chemical structure, C6H18O6Si2, CAS 5851-07-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
5851-07-0
Formula
C6H18O6Si2
Molar mass
242.38 g/mol
EC number
801-834-5
HS code
292090
Category
Silanes and silicones

What is Hexamethoxydisilane?

Plain description, key identifiers and synonyms

Hexamethoxydisilane is a chemical substance with the molecular formula C6H18O6Si2 and a molar mass of 242.38 g/mol. Its CAS registry number is 5851-07-0. The IUPAC name is trimethoxy(trimethoxysilyl)silane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
trimethoxy(trimethoxysilyl)silane
CAS number
5851-07-0 CAS number cross-checked
EC numbers
801-834-5, 933-619-8
Molecular formula
C6H18O6Si2
MDL number
MFCD00271005
InChIKey
LMQGXNPPTQOGDG-UHFFFAOYSA-N
InChI
InChI=1S/C6H18O6Si2/c1-7-13(8-2,9-3)14(10-4,11-5)12-6/h1-6H3
SMILES (canonical and isomeric)
CO[Si](OC)(OC)[Si](OC)(OC)OC

Synonyms

  • Disilane, hexamethoxy-
  • trimethoxy(trimethoxysilyl)silane
  • Hexamethoxydisilan
  • C6H18O6Si2
  • Hexamethoxydisilane,tech 95%
  • 1,1,1,2,2,2-Hexamethoxydisilane #

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
242.38 g/molcalc.
Exact mass
242.0642 Dacalc.
LogP (octanol/water)
-0.18calc.
Topological polar surface area
55.38 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
7calc.
Heavy atoms
14calc.
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)

Hazard statements

  • H226Flammable liquid and vapour.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H330Fatal if inhaled.
Precautionary statements (27)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • 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.
  • 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.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • 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

Hexamethoxydisilane suppliers

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

Frequently asked questions

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

What is Hexamethoxydisilane?

Hexamethoxydisilane is a chemical substance with the molecular formula C6H18O6Si2 and a molar mass of 242.38 g/mol. Its CAS registry number is 5851-07-0. The IUPAC name is trimethoxy(trimethoxysilyl)silane.

What is the CAS number of Hexamethoxydisilane?

The CAS registry number of Hexamethoxydisilane is 5851-07-0.

What is the molecular formula and weight of Hexamethoxydisilane?

The molecular formula of Hexamethoxydisilane is C6H18O6Si2 and its molar mass is 242.38 g/mol.

Is Hexamethoxydisilane hazardous?

Hexamethoxydisilane carries the GHS signal word "Danger". Main hazards: flammable liquid and vapour, causes skin irritation, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Hexamethoxydisilane?

Hexamethoxydisilane 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 Hexamethoxydisilane?

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What is the price of Hexamethoxydisilane?

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Guides for buyers

Practical guides that help when you source, ship or handle Hexamethoxydisilane

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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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