Description

2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with diazotized 3,3'-dichloro[1,1'-biphenyl]-4,4'-diamine and 5,5'-oxybis[1,3-benzenediol], sodium salts is a high-purity, complex azo dye intermediate of significant industrial importance. This compound is valued for its role in synthesizing specialized dyes and pigments that offer excellent color fastness and stability. It is primarily required by manufacturers in the textile, leather, and specialty ink industries seeking to produce high-performance colorants.

Application

• Key intermediate for the synthesis of high-grade azo dyes and pigments used in textile coloration.
• Production of colorants for leather finishing and dyeing processes.
• Manufacturing of specialized pigments for inks, including printing and packaging inks.
• Potential use in the formulation of colorants for paper and pulp products.
• Research and development of novel functional dyes for advanced materials.
• As a chemical standard for analytical testing and quality control in dye manufacturing.

Basic Information

Product Name	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with diazotized 3,3'-dichloro[1,1'-biphenyl]-4,4'-diamine and 5,5'-oxybis[1,3-benzenediol], sodium salts
CAS No.	98072-99-2
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	C.I. Direct Brown 2; Direct Brown 2; Direct Brown 2, disodium salt; 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with diazotized 3,3'-dichlorobenzidine and 5,5'-oxybis[1,3-benzenediol], sodium salts; Azo dye intermediate from 3,3'-dichlorobenzidine; Benzidine, 3,3'-dichloro-, tetrazotized, coupled with 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid and 5,5'-oxybis[1,3-benzenediol], sodium salts
EINECS	Contact for details

Quality Control

Our products undergo rigorous quality testing to ensure compliance with industry standards. Every batch is analyzed to meet precise specifications for identity, purity, and impurity profiles. Certificates of Analysis (COA) are available upon request, providing full traceability and assurance of consistent quality for your manufacturing processes.

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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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