Description

4-Amino-6-[[4'-[(7-Amino-1-Hydroxy-3-Sulfo-2-Naphtyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-5-Hydroxy-3-[(4-Nitrophenyl)Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt is a high-purity, polyazo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple azo linkages and sulfonic acid groups, makes it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant, colorfast products. Its consistent quality and reliable supply are paramount for ensuring batch-to-batch uniformity in final dye formulations.

Application

• Primary Intermediate for Polyazo Dyes: Serves as a key building block in the synthesis of complex, high molecular weight azo dyes, particularly for deep shades like blacks, navies, and dark browns.
• Textile Dyeing and Printing: Used in the production of dyes for coloring natural and synthetic fibers, including cotton, wool, and nylon, where wash and light fastness are critical.
• Ink Manufacturing: A vital component in formulating high-quality printing inks, especially for packaging and publications requiring intense, stable coloration.
• Pigment Production: Acts as a precursor in the manufacture of organic pigments used in plastics, paints, and industrial coatings.
• Leather Dyeing: Employed in the synthesis of dyes for the leather tanning and finishing industry.
• Paper Coloring: Used in the production of dyes for specialty paper and board products.
• Research & Development: Serves as a standard or experimental compound in chemical research for developing new chromophores and functional materials.

Basic Information

Item	Details
Product Name	4-Amino-6-[[4'-[(7-Amino-1-Hydroxy-3-Sulfo-2-Naphtyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-5-Hydroxy-3-[(4-Nitrophenyl)Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt
CAS No.	4656-30-8
Molecular Formula	C44H28N8Na3O14S3
Molecular Weight	Approx. 1049.89 g/mol
Synonyms	Trisodium 4-amino-6-{[4'-({7-amino-1-hydroxy-3-sulphonato-2-naphthyl}azo)-[1,1'-biphenyl]-4-yl]azo}-5-hydroxy-3-[(4-nitrophenyl)azo]naphthalene-2,7-disulphonate; C.I. Direct Black 19 (disodium salt form); Direct Black 19; Azo Black; Polyazo Black Dye Intermediate; 4-Amino-6-{[4'-({7-amino-1-hydroxy-3-sulfo-2-naphthyl}azo)biphenyl-4-yl]azo}-5-hydroxy-3-[(4-nitrophenyl)azo]naphthalene-2,7-disulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Our production of 4-Amino-6-[[4'-[(7-Amino-1-Hydroxy-3-Sulfo-2-Naphtyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-5-Hydroxy-3-[(4-Nitrophenyl)Azo]-2,7-Naphthalenedisulfonic Acid Trisodium Salt adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure high purity, consistent chromophore strength, and minimal impurity profiles, which are critical for downstream dye performance. Certificates of Analysis (COA) detailing key specifications such as assay, hue value, and impurity levels are provided with each shipment. Our quality protocols are designed to meet the exacting standards of the global dye and pigment manufacturing industry.

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). The product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture. Store away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture (KF)	Max. 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	Max. 20 ppm
Solubility (in Water)	Freely soluble
Hue Value	Batch-specific COA

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