Description

4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex, multi-sulfonated structure provides excellent substantivity and chromophoric properties, making it a critical precursor for synthesizing high-value dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vivid, stable colors with strong technical performance.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-grade reactive dyes for cotton and cellulose fiber dyeing and printing.
• Direct Dye Manufacturing: Used in the production of direct dyes, particularly for applications requiring deep shades and good wet-fastness on paper and textiles.
• Food, Drug, and Cosmetic (FD&C) Colorants: Serves as a precursor in the manufacture of certain certified colorants, subject to stringent purification and regulatory compliance.
• Liquid Crystal Dyes (LCD) and Functional Dyes: Its planar, conjugated structure makes it suitable for developing dyes used in electronic displays and optical data storage.
• Biological Staining Reagents: Used in the synthesis of histological stains and indicators for laboratory and diagnostic applications.
• Research & Development: Employed in academic and industrial R&D for studying azo dye chemistry, photochemistry, and for developing new functional materials.

Basic Information

Product Name	4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt
CAS No.	6507-83-1
Molecular Formula	C32H19N4Na3O13S3
Molecular Weight	848.66 g/mol
Synonyms	Acid Black 52; C.I. 15711; Trisodium 4-hydroxy-3-[[4'-[(1-hydroxy-4-sulphonato-2-naphthyl)azo]biphenyl-4-yl]azo]naphthalene-2,7-disulphonate; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((4'-((1-hydroxy-4-sulfo-2-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-, trisodium salt; C.I. Acid Black 52; Amido Black 10B related compound; Azo dye intermediate for Acid Black 52
EINECS	229-400-0

Quality Control

Our production of 4-Hydroxy-3-[[4'-[(1-Hydroxy-4-Sulfo-2-Naphtyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt adheres to a stringent quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistent composition and performance for your synthesis processes. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with each shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed when not in use to prevent absorption of moisture and degradation.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	25.0% - 30.0%
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.