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C.I. Mordant Brown 33

CAS 3618-62-0

Benzenesulfonic acid, 2,4-diamino-5-[2-(2-hydroxy-5-nitrophenyl)diazenyl]-, sodium salt (1:1)

Companies reported imports and no US production of this chemical to EPA for 2023.

Molecular structure of 3618-62-0
1 Na⁺
US productionZero
Import value, 2024$56M
Import volume21.8K lb
Import dependency100%
Top sourceIndia 70%

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.

C.I. Mordant Brown 33 · US import value by year
$63M2013$90M2022$56M2024$58M2025

2013: $63M · Peak 2022: $90M · 2024: $56M · 2025: $58M

Where It Comes From

Customs basis: HS 320412 · basket

EPA reports by year
2023
US production Zero · Imports 21.8K lb

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
IN 70%IndiaMY 7%MalaysiaCH 4%SwitzerlandCN 4%ChinaDE 3%Germany

Why It Matters

Sectors
Textiles
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

  • •Dye in Textiles, apparel, and leather manufacturing (100%)Processing—incorporation into article

Chemical Identity

CAS3618-62-0
PubChem CIDNot recorded
DTXSIDDTXSID0063101
FormulaC12H10N5NaO6S
Mol. Weight375.29 g/mol
SMILES[Na+].NC1=CC(N)=C(C=C1N=NC1=C(O)C=CC(=C1)[N+]([O-])=O)S([O-])(=O)=O

Data Sources

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Brief citations

C.I. Mordant Brown 33 (CAS 3618-62-0) https://chemicalindependence.com/chemical/3618-62-0/ EPA TSCA Inventory: CAS 3618-62-0. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 3618-62-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 3618-62-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 320412 for CAS 3618-62-0. Reporting year: 2024. https://usatrade.census.gov/