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Silanes and silicones

Pentamethyldisilane

Also known as (CH3)3SiSiH(CH3)2, Disilane, pentamethyl-, 1,1,1,2,2-Pentamethyldisilane #

CAS 812-15-7Formula C5H15Si2Molar mass 131.35 g/molEC 623-033-8
GHS signal word: Danger. Pictograms: Flammable
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Pentamethyldisilane chemical structure, C5H15Si2, CAS 812-15-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
812-15-7
Formula
C5H15Si2
Molar mass
131.35 g/mol
Physical form
Liquid
HS code
293190
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 Pentamethyldisilane?

Plain description, key identifiers and synonyms

Pentamethyldisilane is a chemical substance with the molecular formula C5H15Si2 and a molar mass of 131.35 g/mol. Its CAS registry number is 812-15-7.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
812-15-7 CAS number cross-checked
EC number
623-033-8
Molecular formula
C5H15Si2
InChIKey
RIMLABWNMSNVEE-UHFFFAOYSA-N
InChI
InChI=1S/C5H15Si2/c1-6(2)7(3,4)5/h1-5H3
SMILES (canonical and isomeric)
C[Si](C)[Si](C)(C)C

Synonyms

  • (CH3)3SiSiH(CH3)2
  • Disilane, pentamethyl-
  • 1,1,1,2,2-Pentamethyldisilane #

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.

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
131.35 g/molcalc.
Exact mass
131.0712 Dacalc.
LogP (octanol/water)
2.16calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
7calc.
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

Hazard statements

  • H225Highly flammable liquid and vapour.
Precautionary statements (11)
  • 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.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • 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

Pentamethyldisilane suppliers

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

Frequently asked questions

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

What is Pentamethyldisilane?

Pentamethyldisilane is a chemical substance with the molecular formula C5H15Si2 and a molar mass of 131.35 g/mol. Its CAS registry number is 812-15-7.

What is the CAS number of Pentamethyldisilane?

The CAS registry number of Pentamethyldisilane is 812-15-7.

What is the molecular formula and weight of Pentamethyldisilane?

The molecular formula of Pentamethyldisilane is C5H15Si2 and its molar mass is 131.35 g/mol.

Is Pentamethyldisilane hazardous?

Pentamethyldisilane carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pentamethyldisilane?

Pentamethyldisilane 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 Pentamethyldisilane?

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What is the price of Pentamethyldisilane?

Suppliers quote Pentamethyldisilane 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 Pentamethyldisilane

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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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