Description

7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid is a high-purity, synthetic azo dye intermediate of significant industrial importance. Its value lies in its ability to impart vivid and stable coloration, making it a critical precursor for manufacturing high-performance pigments and dyes. This compound is essential for suppliers and manufacturers in the textile, ink, and specialty coatings industries who require consistent quality and reliable supply chains for their production processes.

Application

This azo dye intermediate serves as a key building block in the synthesis of complex colorants. Its primary and related applications include:

• Textile Dyeing: As a precursor for dyes used on cotton, wool, and synthetic fibers.
• Ink Manufacturing: For producing pigments used in printing inks, including packaging and publication inks.
• Industrial Coatings: In the formulation of paints and coatings for plastics, metals, and other substrates.
• Leather Coloring: Used in the dyeing process for leather goods.
• Paper Coloring: For tinting specialty papers and paper products.
• Plastic Masterbatch: As a colorant component for coloring plastics during polymer processing.
• Research & Development: Serving as a standard or starting material in chemical research for novel dye synthesis.

Basic Information

Product Name	7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid
CAS No.	117-32-8
Molecular Formula	C36H26N4O8S2
Molecular Weight	706.74 g/mol
Synonyms	Direct Brown 44; C.I. 35005; 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-; Direct Brown 44 (VAN); Direct Brown 44, disodium salt; Direct Brown 44, technical grade; Direct Brown 44 dye; Direct Brown 44 intermediate
EINECS	204-186-7

Quality Control

Our production of 7-Hydroxy-8-[[4'-[(4-Hydroxyphenyl)Azo]-3,3'-Dimethyl[1,1'-Biphenyl]-4-Yl]Azo]Naphthalene-1,3-Disulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and impurity profiles. Certificates of Analysis (COA) detailing key parameters are provided to guarantee traceability and batch-to-batch consistency for our industrial partners.

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). Keep away from strong oxidizing agents and incompatible materials. This material is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Water Solubility	Freely soluble

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