Flag of the United StatesAmerican Chemical Independence

C.I. Pigment Red 48 disodium salt

CAS 3564-21-4

2-Naphthalenecarboxylic acid, 4-[2-(5-chloro-4-methyl-2-sulfophenyl)diazenyl]-3-hydroxy-, sodium salt (1:2)

Molecular structure of 3564-21-4
2 Na⁺
US productionNot reported
Import value, 2024$419M
Top sourceIndia 31%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 320417 · basket

These shares come from HS customs code 320417, which covers 80 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 31%IndiaCN 21%ChinaDE 17%GermanyKR 6%South KoreaCA 5%Canada

Why It Matters

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

Chemical Identity

CAS3564-21-4
PubChem CIDNot recorded
DTXSIDDTXSID5063075
FormulaC18H11ClN2Na2O6S
Mol. Weight464.78 g/mol
SMILES[Na+].[Na+].CC1=CC(=C(C=C1Cl)N=NC1=C2C=CC=CC2=CC(C(O)=O)=C1[O-])S([O-])(=O)=O

Data Sources

← Back to Dashboard

Brief citations

C.I. Pigment Red 48 disodium salt (CAS 3564-21-4) https://chemicalindependence.com/chemical/3564-21-4/ EPA TSCA Inventory: CAS 3564-21-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 320417 for CAS 3564-21-4. Reporting year: 2024. https://usatrade.census.gov/