Pigment Red 166

CAS 3905-19-9

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 volumeZero

Top sourceNo public record

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.

Where It Comes From

EPA reports by year

2023: US production Confidential · Imports Zero
2019: US production Confidential · Imports Confidential

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.

Basf

Why It Matters

Sectors

Plastics & RubberPaints & CoatingsPaper & Printing

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

Used in 3 sectors as 1 functional role.

•Pigment in Plastics Material and Resin Manufacturing (50%)Processing—incorporation into formulation, mixture, or reaction product
•Pigment in Printing Ink Manufacturing (40%)Processing—incorporation into formulation, mixture, or reaction product
•Pigment in Paint and Coating Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS3905-19-9

PubChem CID135553566

DTXSIDDTXSID8052063

FormulaC40H24Cl4N6O4

Mol. Weight794.5 g/mol

SMILESC1=CC=C2C(=C1)C=C(C(=C2N=NC3=C(C=CC(=C3)Cl)Cl)O)C(=O)NC4=CC=C(C=C4)NC(=O)C5=CC6=CC=CC=C6C(=C5O)N=NC7=C(C=CC(=C7)Cl)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID8052063Retrieved 2026-04-06
PubChem · compound 135553566Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

Pigment Red 166 (CAS 3905-19-9) https://chemicalindependence.com/chemical/3905-19-9/ EPA CompTox (DSSTox): DTXSID8052063. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID8052063 PubChem: 135553566. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/135553566 EPA Chemical Data Reporting: 3905-19-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 3905-19-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting