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C.I. Direct Blue 218

CAS 28407-37-6

U.S. production volumes are classified as confidential business information.

Molecular structure of 28407-37-6
4 Na⁺ · 2 Cu
US productionCBI
Import value, 2024$18M
Top sourceIndia 41%

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. US production volume is confidential. 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 320414 · basket

EPA reports by year
2023
US production Confidential · Imports Confidential
2019
US production 45.0K lb · Imports Zero

These shares come from HS customs code 320414, which covers 36 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 41%IndiaMX 33%MexicoJP 8%JapanDE 6%GermanyTW 3%Taiwan
EPA-registered manufacturers (1)
Kemira Water Solutions

Why It Matters

Sectors
TextilesPaper & Printing
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 2 sectors as 1 functional role.

  • •Dye in Paper Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Dye in Synthetic Dye and Pigment Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS28407-37-6
PubChem CID34237
DTXSIDDTXSID2020187
FormulaC32H20Cu2N6Na4O16S4
Mol. Weight1091.9 g/mol
SMILESC1=CC(=C(C=C1C2=CC(=C(C=C2)N=NC3=C(C4=C(C=C(C=C4C=C3S(=O)(=O)[O-])S(=O)(=O)[O-])N)O)O)O)N=NC5=C(C6=C(C=C(C=C6C=C5S(=O)(=O)[O-])S(=O)(=O)[O-])N)O.[Na+].[Na+].[Na+].[Na+].[Cu].[Cu]

Data Sources

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Brief citations

C.I. Direct Blue 218 (CAS 28407-37-6) https://chemicalindependence.com/chemical/28407-37-6/ EPA CompTox (DSSTox): DTXSID2020187. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2020187 PubChem: 34237. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/34237 EPA Chemical Data Reporting: 28407-37-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 28407-37-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 320414 for CAS 28407-37-6. Reporting year: 2024. https://usatrade.census.gov/