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1,3,3,5-Tetramethyl-1,1,5,5-tetraphenyltrisiloxane

CAS 3982-82-9

Companies reported imports and no US production of this chemical to EPA for 2023.

Molecular structure of 3982-82-9
US productionZero
Import value, 2024$537M
Import volume30.1K lb
Import dependency100%
Top sourceChina 39%

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

1,3,3,5-Tetramethyl-1,1,5,5-tetraphenyltrisiloxane · US import value by year
$1.1B2013$537M2024$470M2025

Peak 2013: $1.1B · 2024: $537M · 2025: $470M

Where It Comes From

Customs basis: HS 293190 · basket

EPA reports by year
2023
US production Zero · Imports 30.1K lb
2019
US production Zero · Imports 42.0K lb

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 importers (1)
Shin Etsu Silicones Of America

Why It Matters

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

Industrial Uses

  • •Lubricating agent in Synthetic Rubber Manufacturing (25%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$2.76/gAK Scientific, Inc.
CountryUnited States
Pack$276.00 / 100 g
PurityNot recorded
Vendors1 available

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

Chemical Identity

CAS3982-82-9
PubChem CID19882
DTXSIDDTXSID2052073
FormulaC28H32O2Si3
Mol. Weight484.8 g/mol
SMILESC[Si](C)(O[Si](C)(C1=CC=CC=C1)C2=CC=CC=C2)O[Si](C)(C3=CC=CC=C3)C4=CC=CC=C4

Data Sources

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Brief citations

1,3,3,5-Tetramethyl-1,1,5,5-tetraphenyltrisiloxane (CAS 3982-82-9) https://chemicalindependence.com/chemical/3982-82-9/ EPA CompTox (DSSTox): DTXSID2052073. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2052073 PubChem: 19882. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/19882 EPA Chemical Data Reporting: 3982-82-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 3982-82-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 3982-82-9. Reporting year: 2024. https://usatrade.census.gov/