Description

Disodium 4-Amino-3-[[4-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Sulphonyl]Phenyl]Azo]-5-Hydroxy-6-(Phenylazo)Naphthalene-2,7-Disulphonate is a high-purity, complex synthetic dye belonging to the azo dye class, specifically engineered for demanding technical applications. Its multi-azo and sulphonate structure provides excellent color strength and substantivity, making it a critical component for achieving deep, vibrant shades. This product is essential for manufacturers in the textile, leather, and specialty ink industries who require consistent, high-performance colorants for their processes.

Application

• Textile Dyeing: Primary application for dyeing natural and synthetic fibers, particularly where deep, complex shades are required.
• Leather Finishing: Used in the coloration of leather goods, providing rich, durable color.
• Specialty Inks: A key pigment for formulating high-performance inks used in security printing, packaging, and other specialized applications.
• Paper Coloration: Employed in the production of high-quality colored papers and boards.
• Biological Staining: Potential use as a histological stain in laboratory settings due to its specific chromophore structure.
• Research & Development: Serves as a chemical intermediate or reference standard in the synthesis and analysis of complex dye molecules.

Basic Information

Product Name	Disodium 4-Amino-3-[[4-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Sulphonyl]Phenyl]Azo]-5-Hydroxy-6-(Phenylazo)Naphthalene-2,7-Disulphonate
CAS No.	52204-07-6
Molecular Formula	C40H26N10Na2O11S3
Molecular Weight	964.86 g/mol
Synonyms	Direct Black 22 (C.I. 35435); Azo Black; Disodium 4-Amino-5-hydroxy-3,6-bis[[4-[(4-sulfophenyl)azo]phenyl]azo]-2,7-naphthalenedisulfonate; C.I. Direct Black 22; 4-Amino-5-hydroxy-3,6-bis[[4-[(4-sulfophenyl)azo]phenyl]azo]-2,7-naphthalenedisulfonic acid disodium salt; Direct Black BS; Pontamine Black EBN
EINECS	257-734-5

Quality Control

Our production of Disodium 4-Amino-3-[[4-[[4-[(2,4-Diaminophenyl)Azo]Phenyl]Sulphonyl]Phenyl]Azo]-5-Hydroxy-6-(Phenylazo)Naphthalene-2,7-Disulphonate adheres to stringent quality management protocols. Each batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength, and tests for insolubles and heavy metals to ensure it meets precise customer and industry specifications. Certificates of Analysis (COA) detailing all test results are provided with every shipment.

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 when not in use to prevent absorption of atmospheric moisture, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark blue-black to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	98 - 102% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Conforms
Ash Content (Sulfated)	≤ 30.0%
Heavy Metals (as Pb)	≤ 20 ppm

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