Disodium 3-hydroxynaphthalene-2,7-disulfonate

CAS 135-51-3

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$11M

Top sourceIndia 78%

At least one company claimed its 2019 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: 2019. 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

EPA reports by year

2023: US production Not published · Imports Not published
2019: US production Confidential · Imports Confidential

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

Country of origin for US imports, from Census customs data (2024).

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

Italy
Hungary
Germany
Netherlands
Canada
Mexico

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Sensient Technologies

Why It Matters

Sectors

Food

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

•Dye in Food, beverage, and tobacco product manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.13/gAaron Chemicals LLC

CountryHong Kong

Pack$67.00 / 500 g

Purity85%

Vendors11 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

10 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.15	500 g	85%
Apollo Scientific US	United Kingdom	$0.17	500 g	—
A2B Chem LLC	United States	$0.43	100 g	95%
AA BLOCKS	United States	$0.53	100 g	95%
AK Scientific, Inc.	United States	$1.35	500 g	95%
Angene International Limited	United States	$2.14	500 g	95%
Key Organics Ltd.	United Kingdom	$2740.00	50 mg	95%
Angene	China → Hong Kong	$4266.67	30 mg	85%
Vitas M Chemical Limited	Hong Kong	$9000.00	10 mg	90%
Princeton BioMolecular Research (SC)	United States	$10500.00	10 mg	90%

Chemical Identity

CAS135-51-3

PubChem CID8673

DTXSIDDTXSID8044543

FormulaC10H6Na2O7S2

Mol. Weight348.3 g/mol

SMILESC1=CC(=CC2=CC(=C(C=C21)O)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]

Data Sources

EPA CompTox (DSSTox) · DTXSID8044543Retrieved 2026-04-06
PubChem · compound 8673Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · 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 3-hydroxynaphthalene-2,7-disulfonate (CAS 135-51-3) https://chemicalindependence.com/chemical/135-51-3/ EPA CompTox (DSSTox): DTXSID8044543. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID8044543 PubChem: 8673. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8673 EPA Chemical Data Reporting: 135-51-3. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 135-51-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290899 for CAS 135-51-3. Reporting year: 2024. https://usatrade.census.gov/