Tris(2,4-di-tert-butylphenyl) phosphite
CAS 31570-04-4
U.S. production volumes are classified as confidential business information.
US productionCBI
Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.
Import value, 2024$23M
Top sourceSingapore 52%
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 292029 · basket
EPA reports by year
- 2023
- US production Confidential · Imports Confidential
- 2019
- US production Confidential · Imports Confidential
These shares come from HS customs code 292029, which covers 28 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
Source Countries
Country of origin for US imports, from Census customs data (2024).
SG 52%SingaporeTW 12%TaiwanIT 9%ItalyGB 7%United KingdomES 7%Spain
- Brunei
- Poland
EPA-registered manufacturers (3)
Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.
Basf Se · DE Germany
Basf
Dover Chemical
Domestic parents -- activity not disclosed (10)
EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.
Blue Tree Holdings
Chemical Distribution Network
Chitec Technology
Jowat
Kraton
Show all 10
Lintech International
Mayzo
Mitsubishi International Polymertrade
R.T. Vanderbilt Holding
Si Group
EPA-registered importers (29)
Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.
Basf Se · DE Germany
Borealis Ag · AT Austria
Braskem S/A · BR Brazil
Canada Imperial Oil · CA Canada
Government Of Abu Dhabi · AE United Arab Emirates
Show all 29
Lg Chem · KR South Korea
Safic-Alcan · FR France
Songwon Industrial · KR South Korea
Syensqo Sa · BE Belgium
Aalborz Chemical
Amfine Chemical
Baerlocher Production
Borealis Compounds
Braskem America
Chemspec
Chevron Phillips Chemical
Colonial Group
Dexco Polymers
Dow Chemical
ExxonMobil
Henkel
Icc Industries
Ineos Styrolution America
Lg Chem America
Lyondell Chemical
Nc Holdings Usa
Solvay
Songwon
Univar Solutions
Why It Matters
Sectors
TransportationConstructionMetals & MiningPlastics & RubberPaints & CoatingsPaper & Printing
Downstream UsesNot recorded
FDA Shortage Status
Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."
No FDA shortage records
Industrial Uses
Used in 11 sectors as 8 functional roles.
- •Antioxidant in Plastics Material and Resin ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Wood Product Manufacturing (4%)Processing—incorporation into article
- •Antioxidant in Adhesive Manufacturing (2%)Processing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Miscellaneous Manufacturing (94%)Processing—incorporation into article
- •Oxidizing agent in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Plastics Product Manufacturing (100%)Processing—incorporation into article
- •Antioxidant in Custom Compounding of Purchased Resins (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Paint and Coating ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Heat stabilizer in Plastics Product Manufacturing (100%)Processing—incorporation into article
- •Heat stabilizer in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Synthetic Rubber ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Rubber Product ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •UV stabilizer in Synthetic Rubber Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
- •UV stabilizer in Plastics Material and Resin Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
- •UV stabilizer in Plastics Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Stabilizing agent in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Antioxidant in Other (10%)Processing—repackaging
- •Antioxidant in Transportation Equipment ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Monomers in Paint and Coating ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Anti-static agent in Plastics Product ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Stabilizing agent in Plastics Product Manufacturing (50%)Processing—incorporation into article
- •Stabilizing agent in Transportation Equipment Manufacturing (50%)Processing—incorporation into article
- •Adhesion/cohesion promoter in Synthetic Rubber Manufacturing (99%)Processing—incorporation into formulation, mixture, or reaction product
Vendor Pricing
$0.02/gAngene Chemical
CountryChina (registered: Hong Kong)
Pack$12.00 / 500 g
Purity98%
Vendors17 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
16 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 | $0.04 | 500 g | 98% |
| BLD Pharmatech Ltd. | China | $0.04 | 1 kg | 97% |
| AA BLOCKS | United States | $0.05 | 500 g | 98% |
| BLD Pharmatech GmbH | Germany | $0.06 | 500 g | 97% |
| AstaTech, Inc | United States | $0.07 | 500 g | 95% |
| BLD Pharmatech Co., Limited | United States | $0.11 | 1 kg | 97% |
| Ambeed, Inc. | United States | $0.11 | 1 kg | 97% |
| AK Scientific Specialized | United States | $0.21 | 500 g | 95% |
| Angene International Limited | United States | $0.24 | 500 g | 98% |
| Combi-Blocks, Inc. | United States | $0.25 | 1 kg | 97% |
| AK Scientific, Inc. | United States | $0.29 | 500 g | 98% |
| Sigma-Aldrich (Rush Stock) | Germany | $0.44 | 500 g | — |
| Sigma-Aldrich | Germany | $0.44 | 500 g | — |
| ChemDiv, Inc. | United States | $4070.00 | 100 mg | 90% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 98% |
| TimTec, LLC (back-ordered) | United States | $32000.00 | 15 mg | 94% |
Chemical Identity
CAS31570-04-4
PubChem CID91601
DTXSIDDTXSID2027969
FormulaC42H63O3P
Mol. Weight646.9 g/mol
SMILESCC(C)(C)C1=CC(=C(C=C1)OP(OC2=C(C=C(C=C2)C(C)(C)C)C(C)(C)C)OC3=C(C=C(C=C3)C(C)(C)C)C(C)(C)C)C(C)(C)C
Data Sources
- EPA CompTox (DSSTox) · DTXSID2027969Retrieved 2026-04-06
- PubChem · compound 91601Retrieved 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
Tris(2,4-di-tert-butylphenyl) phosphite (CAS 31570-04-4) https://chemicalindependence.com/chemical/31570-04-4/ EPA CompTox (DSSTox): DTXSID2027969. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2027969 PubChem: 91601. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/91601 EPA Chemical Data Reporting: 31570-04-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 31570-04-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292029 for CAS 31570-04-4. Reporting year: 2024. https://usatrade.census.gov/