1,5-Naphthalenedisulfonic acid, disodium salt

CAS 1655-29-4

EPA’s 2023 records show zero U.S. production of this chemical.

Molecular structure of 1655-29-4 — 2 Na⁺

US productionZero

Import value, 2024$40M

Import volumeCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceGermany 22%

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. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 290410 · basket

EPA reports by year

2023: US production Zero · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 290410, which covers 115 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).

DE 22%GermanyIT 20%ItalyCN 14%ChinaBE 11%BelgiumIN 11%India

Spain
Netherlands
Czech Republic
Brazil
Taiwan
Hong Kong

Why It Matters

Sectors

Metals & Mining

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

Used in 1 sector as 2 functional roles.

•Anti-scaling agent in OtherProcessing—incorporation into formulation, mixture, or reaction product
•Corrosion inhibitor in OtherProcessing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.02/gAaron Chemicals LLC

CountryHong Kong

Pack$12.00 / 500 g

Purity98%

Vendors16 available

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

15 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.03	500 g	95%
A2B Chem LLC	United States	$0.04	500 g	95%
AA BLOCKS	United States	$0.04	500 g	98%
BLD Pharmatech Co., Limited	United States	$0.04	1 kg	98%
BLD Pharmatech GmbH	Germany	$0.04	1 kg	98%
BLD Pharmatech Ltd.	China	$0.04	1 kg	98%
Ambeed, Inc.	United States	$0.04	1 kg	98%
Apollo Scientific US	United Kingdom	$0.08	500 g	98%
Fluorochem UK	United Kingdom	$0.13	100 g	98%
Sigma-Aldrich (Rush Stock)	Germany	$0.17	1 kg	85%
Sigma-Aldrich	Germany	$0.17	1 kg	85%
Angene International Limited	United States	$0.24	500 g	98%
Combi-Blocks, Inc.	United States	$0.25	1 kg	98%
ChemBridge Corporation	Kazakhstan	$1860.00	100 mg	90%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS1655-29-4

PubChem CID74248

DTXSIDDTXSID7041255

FormulaC10H6Na2O6S2

Mol. Weight332.3 g/mol

SMILESC1=CC2=C(C=CC=C2S(=O)(=O)[O-])C(=C1)S(=O)(=O)[O-].[Na+].[Na+]

Data Sources

EPA CompTox (DSSTox) · DTXSID7041255Retrieved 2026-04-06
PubChem · compound 74248Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · 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

1,5-Naphthalenedisulfonic acid, disodium salt (CAS 1655-29-4) https://chemicalindependence.com/chemical/1655-29-4/ EPA CompTox (DSSTox): DTXSID7041255. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7041255 PubChem: 74248. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/74248 EPA Chemical Data Reporting: 1655-29-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1655-29-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290410 for CAS 1655-29-4. Reporting year: 2024. https://usatrade.census.gov/