Triphenoxyvinylsilane
CAS 18666-65-4
Benzene, 1,1',1''-[(ethenylsilylidyne)tris(oxy)]tris-
EPA and Census publish no US supply data for this chemical.
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 unknownWhere 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.
Vendor Pricing
$7.60/gCombi-Blocks, Inc.
CountryUnited States
Pack$190.00 / 25 g
Purity95%
Vendors10 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
9 more vendors
| Vendor | Country Supplier country. Where available, shows shipping origin. When the supplier ships from a different country than where they are registered, both are shown. Most suppliers show registration country only. | $/g | Pack | Purity |
|---|---|---|---|---|
| A2B Chem LLC | United States | $7.60 | 25 g | 95% |
| BLD Pharmatech Co., Limited | United States | $9.00 | 25 g | 95% |
| Ambeed, Inc. | United States | $9.00 | 25 g | 95% |
| AA BLOCKS | United States | $10.28 | 25 g | 95% |
| AstaTech (2 weeks) | United States | $13.40 | 25 g | 95% |
| BLD Pharmatech Ltd. | China | $14.00 | 5 g | 95% |
| Aaron Chemicals LLC | Hong Kong | $15.80 | 5 g | 95% |
| Angene Chemical | China → Hong Kong | $18.40 | 5 g | 95% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 95% |
Chemical Identity
CAS18666-65-4
PubChem CIDNot recorded
DTXSIDDTXSID3066396
FormulaC20H18O3Si
Mol. Weight334.446 g/mol
SMILESC=C[Si](OC1=CC=CC=C1)(OC1=CC=CC=C1)OC1=CC=CC=C1
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
Triphenoxyvinylsilane (CAS 18666-65-4) https://chemicalindependence.com/chemical/18666-65-4/ EPA TSCA Inventory: CAS 18666-65-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory