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Sulfurous acid, calcium salt (2:1)

CAS 13780-03-5

Used in 1 industrial sector tracked by the EPA.

Molecular structure of 13780-03-5
1 Ca²⁺
US production162.9M lb
Import volumeZero
Import dependency0%
Top sourceNo public record

Production is reported production, not a complete census of factories. 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 283220 · basket

EPA reports by year
2023
US production 162.9M lb · Imports Zero

HS customs code 283220 covers 11 tracked chemicals in total. US Census does not break out this chemical's share, so the country-of-origin mix is not available. EPA CDR reports import dependency at the chemical level separately, shown above.

EPA-registered manufacturers (2)
Karta Halten Bv · NL Netherlands
Domtar

Why It Matters

Sectors
Paper & Printing
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

  • •Intermediate in Paper Manufacturing (100%)Use—non-incorporative activities

Chemical Identity

CAS13780-03-5
PubChem CIDNot recorded
DTXSIDDTXSID50889620
FormulaCaH2O6S2
Mol. Weight202.21 g/mol
SMILES[Ca++].OS([O-])=O.OS([O-])=O

Data Sources

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Brief citations

Sulfurous acid, calcium salt (2:1) (CAS 13780-03-5) https://chemicalindependence.com/chemical/13780-03-5/ EPA TSCA Inventory: CAS 13780-03-5. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 13780-03-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 13780-03-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting