FD&C Red 4

CAS 4548-53-2

1-Naphthalenesulfonic acid, 3-[2-(2,4-dimethyl-5-sulfophenyl)diazenyl]-4-hydroxy-, sodium salt (1:2)

Molecular structure of 4548-53-2 — 2 Na⁺

US productionNot reported

Import value, 2024$56M

Top sourceIndia 70%

EPA lists this chemical for 2023 but publishes zero or no volume for both production and imports.

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 320412 · basket

EPA reports by year

2023: US production Not published · Imports Not published

These shares come from HS customs code 320412, which covers 106 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 70%IndiaMY 7%MalaysiaCH 4%SwitzerlandCN 4%ChinaDE 3%Germany

Ireland
United Kingdom
Spain
South Korea
Denmark
Pakistan
Hong Kong
Czech Republic
Brazil
Turkey

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.

Target

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Vendor Pricing

$3.36/gAA BLOCKS

CountryUnited States

Pack$84.00 / 25 g

Purity95%

Vendors2 available

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

1 more vendor

Vendor	Country	$/g	Pack	Purity
Aaron Chemicals LLC	Hong Kong	$13.60	5 g	95%

Chemical Identity

CAS4548-53-2

PubChem CIDNot recorded

DTXSIDDTXSID2021234

FormulaC18H14N2Na2O7S2

Mol. Weight480.42 g/mol

SMILES[Na+].[Na+].CC1=CC(C)=C(C=C1N=NC1=CC(=C2C=CC=CC2=C1O)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
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

FD&C Red 4 (CAS 4548-53-2) https://chemicalindependence.com/chemical/4548-53-2/ EPA TSCA Inventory: CAS 4548-53-2. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 4548-53-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 320412 for CAS 4548-53-2. Reporting year: 2024. https://usatrade.census.gov/