Description

Disodium 4-Amino-5-Hydroxy-3-[[4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex polyazo structure provides excellent chromophoric properties, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is primarily sought after by manufacturers in the textile, ink, and specialty coatings industries who require consistent, high-quality intermediates for producing vibrant and stable colorants.

Application

• Primary Intermediate for Textile Dyes: Synthesis of high-grade direct, acid, and reactive dyes for coloring cotton, wool, silk, and nylon fibers.
• Pigment Manufacturing: Key starting material in the production of high-performance organic pigments used in paints, inks, and plastics.
• Specialty Ink Formulation: Used in the manufacture of inks for jet printing, security printing, and other advanced applications requiring precise color properties.
• Liquid Crystal Display (LCD) Color Filters: Potential application in the synthesis of dyes for color filters in electronic displays.
• Biological Staining Reagents: Serves as a precursor for developing specialized stains used in histology and microscopy.
• Research & Development: Utilized in chemical research for studying azo dye chemistry, photophysical properties, and developing novel functional materials.

Basic Information

Item	Detail
Product Name	Disodium 4-Amino-5-Hydroxy-3-[[4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonate
CAS No.	3626-28-6
Molecular Formula	C40H26N8Na2O9S2
Molecular Weight	888.80 g/mol
Synonyms	Direct Black 19 (disodium salt); C.I. 35255; Pontamine Black E; Azo Black; 4-Amino-5-hydroxy-3,6-bis(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt; 3,6-Bis(phenylazo)-4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt; 1,3-Naphthalenedisulfonic acid, 7-amino-4-hydroxy-3,6-bis(phenylazo)-, disodium salt
EINECS	Contact for details

Quality Control

Our Disodium 4-Amino-5-Hydroxy-3-[[4'-[(4-Hydroxyphenyl)Azo][1,1'-Biphenyl]-4-Yl]Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonate is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and quality assurance for your production 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 (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and performance.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (in Water)	Clear solution
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.5%

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