Naphthalene-2-sulfonic acid

CAS 120-18-3

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$40M

Top sourceGermany 22%

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 290410 · 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 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

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.

Nouryon Surface Chemistry

Why It Matters

Sectors

Agriculture

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 Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.10/gAaron Chemicals LLC

CountryHong Kong

Pack$49.00 / 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	$0.10	500 g	98%
Combi-Blocks, Inc.	United States	$0.32	1 kg	95%
A2B Chem LLC	United States	$0.34	1 kg	95%
AA BLOCKS	United States	$0.36	1 kg	95%
Ambeed, Inc.	United States	$0.48	500 g	98%
AstaTech, Inc	United States	$0.57	100 g	95%
AK Scientific, Inc.	United States	$0.68	100 g	—
Apollo Scientific UK	United Kingdom	$0.82	100 g	98%
ALFA AESAR	Germany	$1.18	500 g	98%
AK Scientific Specialized	United States	$2.40	5 g	95%
Angene International Limited	United States	$10.80	5 g	95%
Labotest KG	Germany	$453.00	1000 mg	90%
A2B Chem LLC (2 weeks)	United States	$3120.00	100 mg	—
AA BLOCKS (2 weeks)	United States	$3480.00	100 mg	—
Angene	China → Hong Kong	$4266.67	30 mg	98%

Chemical Identity

CAS120-18-3

PubChem CID8420

DTXSIDDTXSID5044788

FormulaC10H8O3S

Mol. Weight208.24 g/mol

SMILESC1=CC=C2C=C(C=CC2=C1)S(=O)(=O)O

Data Sources

EPA CompTox (DSSTox) · DTXSID5044788Retrieved 2026-04-06
PubChem · compound 8420Retrieved 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

Naphthalene-2-sulfonic acid (CAS 120-18-3) https://chemicalindependence.com/chemical/120-18-3/ EPA CompTox (DSSTox): DTXSID5044788. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5044788 PubChem: 8420. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8420 EPA Chemical Data Reporting: 120-18-3. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 120-18-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290410 for CAS 120-18-3. Reporting year: 2024. https://usatrade.census.gov/