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Octamethylcyclotetrasiloxane

CAS 556-67-2

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

Molecular structure of 556-67-2
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
EPA-registered manufacturers (3)
Ab Specialty Silicones
Dow Chemical
Inland Coatings
Domestic parents -- activity not disclosed (5)
Daxx
Elkem Silicones Usa
Independent Chemical
Milliken &
Wacker Chemical Corporation - Headquarters
EPA-registered importers (12)
Kcc · KR South Korea
Toray Industries · JP Japan
Brb North America
Cht Usa
Ele
Show all 12
H.B. Fuller
Huntsman
Mom Holding
Rpm
Shin Etsu Silicones Of America
The Sherwin Williams
Toray Composite Materials America

Why It Matters

Sectors
WaterConstructionMetals & MiningPlastics & RubberConsumer ProductsPaints & CoatingsCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 12 sectors as 8 functional roles.

  • •Intermediate in All Other Basic Inorganic Chemical Manufacturing (100%)Processing as a reactant
  • •Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Adhesion/cohesion promoter in Adhesive Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Terminator/Blocker in Synthetic Rubber ManufacturingProcessing as a reactant
  • •Monomers in All Other Chemical Product and Preparation Manufacturing (96%)Processing as a reactant
  • •Solvent in Soap, Cleaning Compound, and Toilet Preparation Manufacturing (4%)Processing—incorporation into formulation, mixture, or reaction product
  • •Solvent in Other (20%)Processing—repackaging
  • •Surface modifier in Paint and Coating Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Solvent in All Other Chemical Product and Preparation Manufacturing (100%)Processing—repackaging
  • •Monomers in Not Known or Reasonably AscertainableProcessing—incorporation into formulation, mixture, or reaction product
  • •Intermediate in Synthetic Rubber Manufacturing (5%)Processing—incorporation into formulation, mixture, or reaction product
  • •Intermediate in Miscellaneous Manufacturing (5%)Processing—incorporation into formulation, mixture, or reaction product
  • •Intermediate in All Other Chemical Product and Preparation Manufacturing (50%)Processing—incorporation into formulation, mixture, or reaction product
  • •Diluent in All Other Chemical Product and Preparation Manufacturing (40%)Processing—incorporation into formulation, mixture, or reaction product
  • •Viscosity modifiers in All Other Chemical Product and Preparation Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
  • •Monomers in Plastics Product Manufacturing (100%)Processing as a reactant
  • •Intermediate in Utilities (100%)Processing—incorporation into article

Vendor Pricing

$0.01/gAaron Chemicals LLC
CountryHong Kong
Pack$13.00 / 1 kg
Purity98%
Vendors13 available

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

12 more vendors
VendorCountry$/gPackPurity
Angene ChemicalChina → Hong Kong$0.02500 g98%
A2B Chem LLCUnited States$0.13100 g98%
Fluorochem UKUnited Kingdom$0.141 kg98%
Fluorochem EUGermany$0.14500 g98%
Ambeed, Inc.United States$0.17100 g98%
Angene International LimitedUnited States$0.76500 g98%
MedChemExpress MCESweden$1.28100 g99.86%
AA BLOCKSUnited States$1.36100 g98%
Sigma-Aldrich (Rush Stock)Germany$2.54100 g98%
Sigma-AldrichGermany$2.54100 g98%
Labotest KGGermany$217.805000 mg90%
AngeneChina → Hong Kong$4266.6730 mg98%

Chemical Identity

CAS556-67-2
PubChem CID11169
DTXSIDDTXSID7027205
FormulaC8H24O4Si4
Mol. Weight296.61 g/mol
SMILESC[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C

Data Sources

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Brief citations

Octamethylcyclotetrasiloxane (CAS 556-67-2) https://chemicalindependence.com/chemical/556-67-2/ EPA CompTox (DSSTox): DTXSID7027205. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7027205 PubChem: 11169. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/11169 EPA Chemical Data Reporting: 556-67-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 556-67-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 556-67-2. Reporting year: 2024. https://usatrade.census.gov/