Description

Disodium 3-[[4-[[4-Amino-6(Or 7)-Sulphonatonaphthyl]Azo]Phenyl]Azo]-6-[(2,4-Diaminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its complex polyazo structure makes it a critical precursor for producing high-performance dyes and pigments with excellent color fastness and tinctorial strength. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to formulate vibrant, durable colors.

Application

• Primary Intermediate for Direct Dyes: A key building block in the synthesis of direct dyes for cotton, viscose, and other cellulosic fibers.
• Leather Dyeing: Used in the production of dyes for achieving deep, uniform shades on leather goods.
• Paper Coloring: Employed in the manufacture of dyes for specialty paper and packaging products.
• Ink Formulation: Serves as a precursor for pigments used in inks for packaging, printing, and security applications.
• Research & Development: Utilized in chemical research for developing novel chromophores and studying azo dye chemistry.

Basic Information

Product Name	Disodium 3-[[4-[[4-Amino-6(Or 7)-Sulphonatonaphthyl]Azo]Phenyl]Azo]-6-[(2,4-Diaminophenyl)Azo]-4-Hydroxynaphthalene-2-Sulphonate
CAS No.	8003-62-1
Molecular Formula	C32H22N8Na2O8S2
Molecular Weight	748.67 g/mol
Synonyms	Direct Black 38 (technical grade); C.I. 30235; Benzamine Black E; Azo Black; Disodium 4-amino-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate; Pontamine Black E; Chlorazol Black E; Columbia Black E
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and purity. Quality is verified through advanced analytical techniques including HPLC and spectrophotometry. A comprehensive Certificate of Analysis (COA) detailing assay, 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). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, 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%
Moisture Content	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Completely soluble (1% solution)

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