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Sodium 6-hydroxynaphthalene-2-sulfonate

CAS 135-76-2

2-Naphthalenesulfonic acid, 6-hydroxy-, sodium salt (1:1)

Molecular structure of 135-76-2
1 Na⁺
US productionNot reported
Import value, 2024$11M
Top sourceIndia 78%

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 290899 · basket

These shares come from HS customs code 290899, which covers 60 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 78%IndiaCN 19%ChinaJP 1%JapanAE 1%United Arab Emirates

Why It Matters

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

Chemical Identity

CAS135-76-2
PubChem CIDNot recorded
DTXSIDDTXSID7029166
FormulaC10H7NaO4S
Mol. Weight246.21 g/mol
SMILES[Na+].OC1=CC2=C(C=C1)C=C(C=C2)S([O-])(=O)=O

Data Sources

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Brief citations

Sodium 6-hydroxynaphthalene-2-sulfonate (CAS 135-76-2) https://chemicalindependence.com/chemical/135-76-2/ EPA TSCA Inventory: CAS 135-76-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 290899 for CAS 135-76-2. Reporting year: 2024. https://usatrade.census.gov/