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1,1,1,3,5,5,5-Heptamethyltrisiloxane

CAS 1873-88-7

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

Molecular structure of 1873-88-7
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)
Kcc · KR South Korea
Dow Chemical
Mom Holding
Domestic parents -- activity not disclosed (4)
Ab Specialty Silicones
Evonik
Milliken &
Pht International
EPA-registered importers (2)
Mitsubishi Chemical Group · JP Japan
Mitsubishi Chemical America

Why It Matters

Sectors
AgricultureMetals & MiningCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 4 sectors as 3 functional roles.

  • •Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
  • •Monomers in All Other Chemical Product and Preparation Manufacturing (100%)Processing as a reactant
  • •Intermediate in All Other Chemical Product and Preparation Manufacturing (60%)Processing—repackaging
  • •Intermediate in All Other Basic Inorganic Chemical Manufacturing (40%)Processing—repackaging
  • •Surfactant (surface active agent) in Agriculture, Forestry, Fishing and Hunting (20%)Processing as a reactant

Chemical Identity

CAS1873-88-7
PubChem CID6327366
DTXSIDDTXSID1038795
FormulaC7H21O2Si3
Mol. Weight221.5 g/mol
SMILESC[Si](O[Si](C)(C)C)O[Si](C)(C)C

Data Sources

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Brief citations

1,1,1,3,5,5,5-Heptamethyltrisiloxane (CAS 1873-88-7) https://chemicalindependence.com/chemical/1873-88-7/ EPA CompTox (DSSTox): DTXSID1038795. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID1038795 PubChem: 6327366. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6327366 EPA Chemical Data Reporting: 1873-88-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1873-88-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 1873-88-7. Reporting year: 2024. https://usatrade.census.gov/