m-((4-Amino-3-methoxyphenyl)azo)benzenesulphonic acid

CAS 138-28-3

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 volumeZero

Top sourceNo public record

At least one company claimed its 2023 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: 2023.

Where It Comes From

EPA reports by year

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

EPA-registered manufacturers (2)

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

Archroma Management Gmbh · CH Switzerland

Archroma U.S

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 (0%)Processing as a reactant

Chemical Identity

CAS138-28-3

PubChem CID67311

DTXSIDDTXSID3059680

FormulaC13H13N3O4S

Mol. Weight307.33 g/mol

SMILESCOC1=C(C=CC(=C1)N=NC2=CC(=CC=C2)S(=O)(=O)O)N

Data Sources

EPA CompTox (DSSTox) · DTXSID3059680Retrieved 2026-04-06
PubChem · compound 67311Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

m-((4-Amino-3-methoxyphenyl)azo)benzenesulphonic acid (CAS 138-28-3) https://chemicalindependence.com/chemical/138-28-3/ EPA CompTox (DSSTox): DTXSID3059680. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3059680 PubChem: 67311. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/67311 EPA Chemical Data Reporting: 138-28-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 138-28-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting