Octaphenylcyclotetrasiloxane
CAS 546-56-5
U.S. production volumes are classified as confidential business information.
At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.
Why supply is unknownProduction 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
- 2023
- US production Confidential · Imports Confidential
- 2019
- US production Confidential · Imports Zero
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.
- Ireland
- Netherlands
- Switzerland
- Monaco
- Ukraine
- Spain
- Mexico
- Poland
- Indonesia
- Armenia
- Israel
- Sweden
- Australia
- Czech Republic
- Hungary
- Brunei
- Hong Kong
- Brazil
- Thailand
- Argentina
- Finland
- Austria
- Latvia
Why It Matters
Industrial Uses
Used in 2 sectors as 2 functional roles.
- •Intermediate in Synthetic Rubber Manufacturing (100%)Processing as a reactant
- •Monomers in Synthetic Rubber Manufacturing (50%)Processing as a reactant
- •Monomers in Plastics Material and Resin Manufacturing (50%)Processing as a reactant
Vendor Pricing
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
15 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 | $0.20 | 500 g | 98% |
| AA BLOCKS | United States | $0.21 | 500 g | 98% |
| Angene Chemical | China → Hong Kong | $0.21 | 500 g | 98% |
| Combi-Blocks, Inc. | United States | $0.25 | 1 kg | 98% |
| BLD Pharmatech Co., Limited | United States | $0.27 | 1 kg | 98% |
| BLD Pharmatech GmbH | Germany | $0.27 | 1 kg | 98% |
| BLD Pharmatech Ltd. | China | $0.27 | 1 kg | 98% |
| Ambeed, Inc. | United States | $0.27 | 1 kg | 98% |
| MedChemExpress MCE | Sweden | $0.33 | 500 g | — |
| AK Scientific Specialized | United States | $0.51 | 100 g | 95% |
| AK Scientific, Inc. | United States | $0.68 | 100 g | 98% |
| Biopharma PEG Scientific Inc. | United States | $1.00 | 100 g | 95% |
| Angene International Limited | United States | $1.14 | 100 g | 95% |
| AstaTech (2 weeks) | United States | $1.21 | 100 g | 95% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 98% |
Chemical Identity
Data Sources
- EPA CompTox (DSSTox) · DTXSID5052206Retrieved 2026-04-06
- PubChem · compound 68347Retrieved 2026-04-06
- EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
- EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
Octaphenylcyclotetrasiloxane (CAS 546-56-5) https://chemicalindependence.com/chemical/546-56-5/ EPA CompTox (DSSTox): DTXSID5052206. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5052206 PubChem: 68347. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/68347 EPA Chemical Data Reporting: 546-56-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 546-56-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 546-56-5. Reporting year: 2024. https://usatrade.census.gov/