1,3-Naphthalenedisulfonic acid, 7,7'-[iminobis[carbonyl(2-methyl-4,1-phenylene)-2,1-diazenediyl]]bis-, sodium salt (1:4)

CAS 28706-21-0

U.S. production volumes are classified as confidential business information.

Molecular structure of 28706-21-0 — 4 Na⁺

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

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

Paper & Printing

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 Paper Manufacturing (100%)Processing—incorporation into article

Chemical Identity

CAS28706-21-0

PubChem CIDNot recorded

DTXSIDDTXSID90889700

FormulaC36H23N5Na4O14S4

Mol. Weight969.8 g/mol

SMILES[Na+].[Na+].[Na+].[Na+].CC1=C(C=CC(=C1)C(=O)NC(=O)C1=CC(C)=C(C=C1)N=NC1=CC=C2C=C(C=C(C2=C1)S([O-])(=O)=O)S([O-])(=O)=O)N=NC1=CC=C2C=C(C=C(C2=C1)S([O-])(=O)=O)S([O-])(=O)=O

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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

1,3-Naphthalenedisulfonic acid, 7,7'-[iminobis[carbonyl(2-methyl-4,1-phenylene)-2,1-diazenediyl]]bis-, sodium salt (1:4) (CAS 28706-21-0) https://chemicalindependence.com/chemical/28706-21-0/ EPA TSCA Inventory: CAS 28706-21-0. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 28706-21-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 28706-21-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting