Disodium phosphite

CAS 13708-85-5

Phosphonic acid, sodium salt (1:2)

U.S. production volumes are classified as confidential business information.

Molecular structure of 13708-85-5 — 2 Na⁺

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$19M

Top sourceChina 86%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production 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 283510 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential

These shares come from HS customs code 283510, which covers 15 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).

CN 86%ChinaCH 6%SwitzerlandIN 4%IndiaGB 3%United KingdomDE 1%Germany

Denmark
Canada
Mexico
Turkey
Italy

Why It Matters

Sectors

Plastics & Rubber

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

•Antioxidant in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS13708-85-5

PubChem CIDNot recorded

DTXSIDDTXSID20889617

FormulaHNa2O3P

Mol. Weight125.958 g/mol

SMILES[Na+].[Na+].[O-]P([O-])=O

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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

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Brief citations

Disodium phosphite (CAS 13708-85-5) https://chemicalindependence.com/chemical/13708-85-5/ EPA TSCA Inventory: CAS 13708-85-5. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 13708-85-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 13708-85-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283510 for CAS 13708-85-5. Reporting year: 2024. https://usatrade.census.gov/