Description

3,3'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis[4-Hydroxy-5-[(2-Hydroxy-1-Naphthalenyl)Azo]Naphthalene-2,7-Disulfonic Acid Disodium] Salt is a high-purity, polyazo-based chemical compound valued for its intense color properties and structural complexity. This product is essential for applications requiring a sophisticated chromophore with multiple azo linkages and sulfonic acid groups, which contribute to its solubility and binding characteristics. It is primarily sought by manufacturers in the specialty dyes and pigments, advanced material research, and analytical chemistry sectors for developing high-performance colorants and functional materials.

Application

• Specialty Dye Synthesis: A key intermediate for producing high-value, complex azo dyes for textiles, inks, and coatings.
• Functional Pigments: Used in the development of pigments for plastics, masterbatches, and high-durability industrial paints.
• Analytical Reagents: Serves as a chromogenic agent or a standard in spectrophotometric analysis and chemical detection methods.
• Research & Development: Utilized in academic and industrial R&D for studying azo compound chemistry, photophysical properties, and polymer coloration.
• Liquid Crystal Displays (LCDs): Potential application in the formulation of dyes for color filters in display technologies.
• Biological Staining: May be employed in the preparation of specialized histological stains for microscopy.

Basic Information

Item	Detail
Product Name	3,3'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis[4-Hydroxy-5-[(2-Hydroxy-1-Naphthalenyl)Azo]Naphthalene-2,7-Disulfonic Acid Disodium] Salt
CAS No.	6358-73-2
Molecular Formula	C64H38N8O14S4Na2
Molecular Weight	1309.29 g/mol (approx.)
Synonyms	Direct Black 22 (C.I. 35435); Pontamine Black E; Azo Black; C.I. Direct Black 22; Direct Black E; 3,3'-((1,1'-Biphenyl)-4,4'-diyldi-2,1-diazenediyl)bis(4-hydroxy-5-((2-hydroxy-1-naphthalenyl)azo)-2,7-naphthalenedisulfonic acid) disodium salt; 1,5-Naphthalenedisulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diyldi-2,1-diazenediyl)bis(4-hydroxy-5-((2-hydroxy-1-naphthalenyl)azo)-, disodium salt
EINECS	228-782-5

Quality Control

Our production of 3,3'-[[1,1'-Biphenyl]-4,4'-Diylbis(Azo)]Bis[4-Hydroxy-5-[(2-Hydroxy-1-Naphthalenyl)Azo]Naphthalene-2,7-Disulfonic Acid Disodium] Salt adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength, and elemental analysis, to ensure consistency and meet precise customer specifications. Certificates of Analysis (COA) detailing all test results are provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Dark blue to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 5% (vs. Standard)
Moisture Content	≤ 5.0%
Ash Content (Sulfated)	≤ 20.0%
Water Solubility	Freely soluble

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