Description

4,4'-[[1,1'-Biphenyl]-4,4'-Diylbis[Azo(2,4-Dihydroxy-3,1-Phenylene)Azo]]Bis[Benzenesulfonic Acid Sodium] Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex molecular structure provides excellent chromophoric properties, making it a critical precursor for synthesizing specialized dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking consistent quality and reliable supply for their production processes.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-performance, colorfast azo dyes used in textiles, leather, and paper.
• Specialty Ink Formulations: Used in the production of pigments for inks in printing, packaging, and security applications.
• Functional Colorants: Potential use in the development of functional dyes for non-textile applications, such as in optical data storage or liquid crystal displays (LCDs).
• Research & Development: Employed in chemical R&D for studying azo coupling reactions and developing novel chromophores with specific light-absorption properties.
• Analytical Chemistry: Can be used as a standard or reagent in analytical methods for dye identification and quantification.

Basic Information

Item	Detail
Product Name	4,4'-[[1,1'-Biphenyl]-4,4'-Diylbis[Azo(2,4-Dihydroxy-3,1-Phenylene)Azo]]Bis[Benzenesulfonic Acid Sodium] Salt
CAS No.	6473-07-0
Molecular Formula	C40H26N8Na2O10S2
Molecular Weight	888.79 g/mol
Synonyms	Direct Black 19 (sodium salt); C.I. 35255; Benzenesulfonic acid, 4,4'-[[1,1'-biphenyl]-4,4'-diylbis[azo(2,4-dihydroxy-3,1-phenylene)azo]]bis-, disodium salt; 4,4'-Bis[2,4-dihydroxy-3-(4-sulfophenyl)azo]biphenyl-4,4'-diyldiazo]dibenzenesulfonic acid disodium salt; Azo Black; Direct Black BN; Pontamine Black EBN
EINECS	229-314-5

Quality Control

Our production of 4,4'-[[1,1'-Biphenyl]-4,4'-Diylbis[Azo(2,4-Dihydroxy-3,1-Phenylene)Azo]]Bis[Benzenesulfonic Acid Sodium] Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure high purity, consistent chromophore strength, and minimal impurity levels. A detailed Certificate of Analysis (COA) documenting identity, assay, and specific impurity profiles is provided with each shipment to guarantee traceability and compliance with your specifications.

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

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	≤ 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.