Hexaphenyldisiloxane
CAS 1829-40-9
Disiloxane, 1,1,1,3,3,3-hexaphenyl-
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
$2.35/gCombi-Blocks, Inc.
CountryUnited States
Pack$235.00 / 100 g
Purity96%
Vendors14 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
13 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 |
|---|---|---|---|---|
| Aaron Chemicals LLC | Hong Kong | $2.53 | 100 g | 96% |
| Angene Chemical | China → Hong Kong | $2.72 | 100 g | 96% |
| A2B Chem LLC | United States | $2.73 | 100 g | 96% |
| BLD Pharmatech Co., Limited | United States | $2.80 | 25 g | 96% |
| BLD Pharmatech GmbH | Germany | $2.80 | 25 g | 96% |
| BLD Pharmatech Ltd. | China | $2.80 | 25 g | 96% |
| Ambeed, Inc. | United States | $2.80 | 25 g | 96% |
| AA BLOCKS | United States | $2.88 | 100 g | 96% |
| Synthonix | United States | $3.60 | 25 g | 96% |
| AK Scientific, Inc. | United States | $9.24 | 25 g | 96% |
| Angene International Limited | United States | $23.28 | 25 g | 98% |
| AstaTech (2 weeks) | United States | $40.00 | 1 g | 95% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 96% |
Chemical Identity
CAS1829-40-9
PubChem CIDNot recorded
DTXSIDDTXSID0062006
FormulaC36H30OSi2
Mol. Weight534.805 g/mol
SMILESO([Si](C1=CC=CC=C1)(C1=CC=CC=C1)C1=CC=CC=C1)[Si](C1=CC=CC=C1)(C1=CC=CC=C1)C1=CC=CC=C1
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
Brief citations
Hexaphenyldisiloxane (CAS 1829-40-9) https://chemicalindependence.com/chemical/1829-40-9/ EPA TSCA Inventory: CAS 1829-40-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory