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C.I. Acid Orange 6

CAS 547-57-9

Benzenesulfonic acid, 4-[2-(2,4-dihydroxyphenyl)diazenyl]-, sodium salt (1:1)

Molecular structure of 547-57-9
1 Na⁺
US productionNot reported
Import value, 2024$50M
Top sourceIndonesia 23%

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 unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 292700 · basket

These shares come from HS customs code 292700, which covers 89 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
ID 23%IndonesiaJP 18%JapanMX 16%MexicoCN 13%ChinaKR 8%South Korea

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS547-57-9
PubChem CIDNot recorded
DTXSIDDTXSID70873925
FormulaC12H9N2NaO5S
Mol. Weight316.26 g/mol
SMILES[Na+].OC1=CC(O)=C(C=C1)N=NC1=CC=C(C=C1)S([O-])(=O)=O

Data Sources

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Brief citations

C.I. Acid Orange 6 (CAS 547-57-9) https://chemicalindependence.com/chemical/547-57-9/ EPA TSCA Inventory: CAS 547-57-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 292700 for CAS 547-57-9. Reporting year: 2024. https://usatrade.census.gov/