Description

5-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-4-Hydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart specific color properties and its role in synthesizing complex, high-performance dyes. It is primarily needed by manufacturers in the textile, leather, and specialty ink industries who require consistent and reliable intermediates for producing vibrant and stable colorants.

Application

• Textile Dyeing: A key intermediate for the synthesis of direct, acid, and reactive dyes used on cotton, wool, silk, and nylon fibers.
• Leather Coloring: Employed in the production of dyes for imparting deep, uniform colors to leather goods.
• Paper Dyeing: Used in the manufacture of dyes for coloring paper products, including specialty and decorative papers.
• Ink Formulation: Serves as a precursor for pigments and dyes used in printing inks, including inks for textiles and packaging.
• Biological Staining: Potential use as an intermediate for histological stains and indicators in laboratory settings.
• Research & Development: Utilized as a standard or building block in chemical research for developing new chromophores and functional materials.

Basic Information

Item	Details
Product Name	5-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-4-Hydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt
CAS No.	6358-33-4
Molecular Formula	C34H24N8Na2O7S2
Molecular Weight	782.71 g/mol
Synonyms	Direct Black 38 (disodium salt); C.I. 30235; Azo Black; 2,7-Naphthalenedisulfonic acid, 5-amino-3-[[4'-[(2,4-diaminophenyl)azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt; Pontamine Black E; Chlorazol Black E; Diazol Black 2V; Benzo Black
EINECS	228-787-8

Quality Control

Our production of 5-Amino-3-[[4'-[(2,4-Diaminophenyl)Azo]-1,1'-Biphenyl-4-Yl]Azo]-4-Hydroxy-2,7-Naphthalenedisulfonic Acid Disodium Salt adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing to ensure high purity, consistent color value, and minimal impurity levels. Comprehensive Certificates of Analysis (COA) detailing identity, assay, and specific impurity profiles are available upon request to support your quality assurance protocols.

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 after opening to prevent absorption of atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Ash Content	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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