Description

2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-, coupled with diazotized 5-amino-2-[(4-aminophenyl)amino]benzenesulfonic acid, diazotized, coupled with m-phenylenediamine, sodium salts is a high-purity, complex diazo dye intermediate essential for producing vibrant and stable colorants. This compound matters because it provides the critical chromophoric structure required for high-performance dyes with excellent lightfastness and wash resistance. It is primarily needed by manufacturers in the textile, leather, and specialty ink industries seeking to formulate advanced azo dyes and pigments.

Application

• Primary Intermediate for Azo Dyes: Serves as a key coupling component in the synthesis of high-grade, polyazo direct dyes and acid dyes for textiles like cotton, wool, and nylon.
• Leather Coloring Agent: Used in the production of dyes for leather finishing, providing deep, uniform shades with good adhesion.
• Specialty Ink Formulation: A crucial building block for creating pigments used in inks for packaging, security printing, and other industrial applications.
• Paper Dye Synthesis: Employed in manufacturing dyes for coloring paper products, where color consistency and stability are paramount.
• Research & Development: Used in chemical R&D laboratories for developing novel chromophores and studying dye chemistry.

Basic Information

Product Name	2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-, coupled with diazotized 5-amino-2-[(4-aminophenyl)amino]benzenesulfonic acid, diazotized, coupled with m-phenylenediamine, sodium salts
CAS No.	90459-13-5
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Direct Black 166; Direct Black 166; Diazotized 5-Amino-2-[(4-Aminophenyl)Amino]Benzenesulfonic Acid, Coupled With 6-Amino-4-Hydroxy-2-Naphthalenesulfonic Acid And M-Phenylenediamine, Sodium Salts; Black 166; Azo Dye Intermediate Black 166; Benzenesulfonic acid, 5-amino-2-[(4-aminophenyl)amino]-, diazotized, coupled with 6-amino-4-hydroxy-2-naphthalenesulfonic acid and m-phenylenediamine, sodium salts
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and purity for reliable synthesis downstream. Quality is verified through advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder or granules
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Ash Content	Max. 20.0%
Water Solubility	Conforms

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.