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Tetrasiloxane, 3,5-bis[(dimethylsilyl)oxy]-1,1,7,7-tetramethyl-3,5-diphenyl-

CAS 66817-59-2

EPA and Census publish no US supply data for this chemical.

Molecular structure of 66817-59-2
US productionNot reported
Top sourceNo public record

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Where It Comes From

EPA and Census publish no US supply data for this chemical.

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS66817-59-2
PubChem CIDNot recorded
DTXSIDDTXSID70886813
FormulaC20H38O5Si6
Mol. Weight527.029 g/mol
SMILESC[SiH](C)O[Si](O[SiH](C)C)(O[Si](O[SiH](C)C)(O[SiH](C)C)C1=CC=CC=C1)C1=CC=CC=C1

Data Sources

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Brief citations

Tetrasiloxane, 3,5-bis[(dimethylsilyl)oxy]-1,1,7,7-tetramethyl-3,5-diphenyl- (CAS 66817-59-2) https://chemicalindependence.com/chemical/66817-59-2/ EPA TSCA Inventory: CAS 66817-59-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory