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Hexamethylcyclotrisiloxane

CAS 541-05-9

U.S. production volumes are classified as confidential business information.

Molecular structure of 541-05-9
US productionCBI
Import value, 2024$537M
Top sourceChina 39%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293190 · basket

EPA reports by year
2023
US production Confidential · Imports Confidential
2019
US production Confidential · Imports Confidential

These shares come from HS customs code 293190, which covers 378 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 39%ChinaDE 17%GermanyIT 9%ItalyIN 7%IndiaJP 7%Japan
Domestic parents -- activity not disclosed (1)
Wacker Chemical Corporation - Headquarters
EPA-registered importers (3)
Kcc · KR South Korea
Mom Holding
Shin Etsu Silicones Of America

Why It Matters

Sectors
Plastics & RubberCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 3 sectors as 2 functional roles.

  • •Monomers in All Other Basic Inorganic Chemical Manufacturing (90%)Processing as a reactant
  • •Monomers in Synthetic Rubber Manufacturing (10%)Processing as a reactant
  • •Monomers in All Other Chemical Product and Preparation ManufacturingProcessing as a reactant
  • •Binder in Synthetic Rubber Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.04/gAaron Chemicals LLC
CountryHong Kong
Pack$22.00 / 500 g
Purity98%
Vendors14 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

13 more vendors
VendorCountry$/gPackPurity
Angene ChemicalChina → Hong Kong$0.05500 g98%
Fluorochem UKUnited Kingdom$0.19100 g95%
A2B Chem LLCUnited States$0.261 kg98%
AA BLOCKSUnited States$0.281 kg98%
Ambeed, Inc.United States$0.361 kg98%
Biopharma PEG Scientific Inc.United States$0.36500 g98%
Combi-Blocks, Inc.United States$0.361 kg98%
AK Scientific SpecializedUnited States$0.38500 g98%
AK Scientific, Inc.United States$0.51500 g99%
Sigma-Aldrich (Rush Stock)Germany$0.92100 g98%
Sigma-AldrichGermany$0.92100 g98%
Angene International LimitedUnited States$2.8025 g98%
AngeneChina → Hong Kong$4266.6730 mg98%

Chemical Identity

CAS541-05-9
PubChem CID10914
DTXSIDDTXSID6027185
FormulaC6H18O3Si3
Mol. Weight222.46 g/mol
SMILESC[Si]1(O[Si](O[Si](O1)(C)C)(C)C)C

Data Sources

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Brief citations

Hexamethylcyclotrisiloxane (CAS 541-05-9) https://chemicalindependence.com/chemical/541-05-9/ EPA CompTox (DSSTox): DTXSID6027185. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6027185 PubChem: 10914. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/10914 EPA Chemical Data Reporting: 541-05-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 541-05-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 541-05-9. Reporting year: 2024. https://usatrade.census.gov/