Description

5-Amino-4-Hydroxy-3-[[4'-[(2-Hydroxy-1-Naphthalenyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]Naphthalene-2,7-Disulfonic Acid Disodium Salt is a high-purity, synthetic azo dye intermediate of significant industrial importance. Its complex molecular structure, featuring multiple azo linkages and sulfonic acid groups, provides excellent chromophoric properties and water solubility. This compound is primarily sought after by manufacturers in the specialty dyes and pigments sector for producing high-value colorants with specific performance characteristics.

Application

• Primary Intermediate for Azo Dyes: Serves as a critical building block in the synthesis of high-performance, polyazo direct dyes and acid dyes.
• Textile Dyeing: Used in the production of dyes for coloring natural fibers like cotton, wool, and silk, offering good wash and light fastness.
• Leather Coloring: Applied in the formulation of dyes for the leather tanning and finishing industry.
• Paper Dyeing: Employed in the manufacture of dyes for specialty paper products.
• Ink Formulations: Acts as a key component in the production of inks for various printing applications.
• Research & Development: Utilized in chemical research for developing novel chromophores and studying azo dye chemistry.

Basic Information

Product Name	5-Amino-4-Hydroxy-3-[[4'-[(2-Hydroxy-1-Naphthalenyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]Naphthalene-2,7-Disulfonic Acid Disodium Salt
CAS No.	6426-68-2
Molecular Formula	C38H24N6Na2O9S2
Molecular Weight	826.73 g/mol
Synonyms	Direct Black 19 (disodium salt); C.I. 35255; 5-Amino-4-hydroxy-3-((4'-((2-hydroxy-1-naphthyl)azo)(1,1'-biphenyl)-4-yl)azo)-2,7-naphthalenedisulfonic acid disodium salt; 2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-((4'-((2-hydroxy-1-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-, disodium salt; Direct Black BN; Amanil Black B; Azo Black; Diazol Black BN
EINECS	229-199-5

Quality Control

Our production of this azo dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed using advanced techniques like HPLC to confirm identity and assay. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to support your quality assurance 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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which may affect quality.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.