Description

Disodium 7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonate is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for producing vibrant and stable colorants used across multiple industries. This compound is essential for manufacturers and R&D facilities in the dyes and pigments, textile, and specialty chemical sectors seeking reliable, high-quality intermediates for their formulations.

Application

• Primary Intermediate for Azo Dyes: Serves as a crucial building block in the synthesis of high-performance disazo and polyazo dyes, particularly for shades of red, brown, and black.
• Textile Dyeing and Printing: Used in the production of dyes for coloring natural and synthetic fibers, including cotton, wool, and nylon, offering good wash and light fastness.
• Pigment Manufacturing: Acts as a key component in the creation of organic pigments for inks, paints, coatings, and plastics.
• Leather Industry: Employed in the formulation of dyes for leather finishing, providing deep, uniform coloration.
• Paper Coloring: Utilized in the production of dyes for specialty papers and paper products.
• Research & Development: Serves as a standard or experimental compound in chemical research for developing new colorants and studying azo chemistry.
• Specialty Chemical Synthesis: Functions as an intermediate for more complex chemical entities in advanced material science applications.

Basic Information

Product Name	Disodium 7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonate
CAS No.	65168-20-9
Molecular Formula	C36H24N4Na2O8S2
Molecular Weight	750.70 g/mol
Synonyms	7-Hydroxy-8-{[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo}naphthalene-1,3-disulfonic acid disodium salt; C.I. Direct Brown 202; Direct Brown 202; Disodium 8-[[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulfonate; Azo dye intermediate brown 202; 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our Disodium 7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, composition, and performance. We provide comprehensive Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and physical characteristics. Our quality commitment ensures the material meets the stringent requirements for use in industrial dye synthesis and other advanced applications.

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 (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Solubility (in Water)	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.