Description

2-Naphthalenesulfonic acid, 6-amino-3-[[4-[(4-amino-2-sulfophenyl)amino]phenyl]azo]-4-hydroxy-, diazotized, coupled with 2,4-diaminobenzenesulfonic acid and p-phenylenediamine is a high-purity, complex azo dye intermediate. This compound is critical for synthesizing high-performance dyes and pigments with excellent color fastness and stability. It is primarily required by manufacturers in the textile, leather, and specialty ink industries for producing deep, vibrant shades.

Application

• Primary Intermediate for Reactive Dyes: Used in the synthesis of high-quality reactive dyes for cotton and other cellulosic fibers.
• Leather Dyeing: Serves as a key component in formulating durable and colorfast dyes for the leather tanning industry.
• Specialty Ink Production: Employed in manufacturing pigments for inks requiring specific optical properties and chemical resistance.
• Textile Printing: A crucial building block for dyes used in textile printing applications, ensuring sharp definition and wash-fastness.
• Research & Development: Used in chemical R&D for developing new chromophores and studying azo dye chemistry.
• Paper Coloring: Can be utilized in the production of dyes for specialty paper products.

Basic Information

Product Name	2-Naphthalenesulfonic acid, 6-amino-3-[[4-[(4-amino-2-sulfophenyl)amino]phenyl]azo]-4-hydroxy-, diazotized, coupled with 2,4-diaminobenzenesulfonic acid and p-phenylenediamine
CAS No.	84583-81-3
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Reactive Black 5 Intermediate; Reactive Black 5 Precursor; Azo Dye Intermediate 84583-81-3; 6-Amino-4-hydroxy-3-[[4-[(4-amino-2-sulfophenyl)amino]phenyl]azo]-2-naphthalenesulfonic acid, diazotized, coupled; Diazotized coupled product of H-acid, p-phenylenediamine, and 2,4-diaminobenzenesulfonic acid; Black 5 Dye Intermediate; Complex Azo Dye Salt
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC and spectrophotometric analysis, to ensure consistent purity and chemical structure integrity. A detailed Certificate of Analysis (COA) specifying assay, impurity profile, and physical characteristics is provided with each shipment to guarantee it meets your precise formulation requirements.

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 material is hygroscopic (moisture-sensitive); ensure the container is kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility (Water)	Test and report
Heavy Metals (as Pb)	Max. 20 ppm

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