6-Amino-4-hydroxynaphthalene-2-sulfonic acid

CAS 90-51-7

Companies reported imports and no US production of this chemical to EPA for 2019.

US productionZero

Import value, 2024$2M

Import volume39.0K lb

Import dependency100%

Top sourceIndia 50%

Production is reported production, not a complete census of factories. Production reporting year: 2019. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

6-Amino-4-hydroxynaphthalene-2-sulfonic acid · US import value by year

2013: $3M · Peak 2014: $5M · 2024: $2M · 2025: $1M

Where It Comes From

Customs basis: HS 292221 · basket

EPA reports by year

2023: US production Not published · Imports Not published
2019: US production Zero · Imports 39.0K lb

These shares come from HS customs code 292221, which covers 8 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 50%IndiaCN 47%ChinaDE 3%Germany

EPA-registered importers (1)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Liberty Specialty Chemicals

Why It Matters

Sectors

Textiles

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

•Intermediate in Synthetic Dye and Pigment Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.06/gA2B Chem LLC

CountryUnited States

Pack$56.00 / 1 kg

Purity97%

Vendors18 available

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

17 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.07	1 kg	97%
Chemscene	United States	$0.08	1 kg	—
BLD Pharmatech Co., Limited	United States	$0.08	1 kg	97%
BLD Pharmatech GmbH	Germany	$0.08	1 kg	97%
BLD Pharmatech Ltd.	China	$0.08	1 kg	97%
Ambeed, Inc.	United States	$0.08	1 kg	97%
Aaron Chemicals LLC	Hong Kong	$0.10	500 g	98%
Angene Chemical	China → Hong Kong	$0.10	500 g	98%
Combi-Blocks, Inc.	United States	$0.25	1 kg	97%
Fluorochem EU	Germany	$0.77	25 g	98%
AstaTech (2 weeks)	United States	$1.48	25 g	95%
AK Scientific, Inc.	United States	$1.93	100 g	97%
Angene International Limited	United States	$3.32	100 g	97%
Princeton BioMolecular Research (SC)	United States	$2900.00	100 mg	90%
Vitas M Chemical Limited	Hong Kong	$3170.00	100 mg	90%
Angene	China → Hong Kong	$4266.67	30 mg	98%
TimTec, LLC	United States	$58000.00	5 mg	90%

Chemical Identity

CAS90-51-7

PubChem CID7022

DTXSIDDTXSID0026547

FormulaC10H9NO4S

Mol. Weight239.25 g/mol

SMILESC1=CC(=CC2=C(C=C(C=C21)S(=O)(=O)O)O)N

Data Sources

EPA CompTox (DSSTox) · DTXSID0026547Retrieved 2026-04-06
PubChem · compound 7022Retrieved 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

6-Amino-4-hydroxynaphthalene-2-sulfonic acid (CAS 90-51-7) https://chemicalindependence.com/chemical/90-51-7/ EPA CompTox (DSSTox): DTXSID0026547. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0026547 PubChem: 7022. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/7022 EPA Chemical Data Reporting: 90-51-7. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 90-51-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292221 for CAS 90-51-7. Reporting year: 2024. https://usatrade.census.gov/