Description

3-[[4-[(1-Hydroxy-6-Phenylamino-3-Sodiosulfo-2-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Naphthalene-1,5-Disulfonic Acid Disodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex polyazo structure provides excellent chromophoric properties, making it a critical precursor for synthesizing high-performance dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce vibrant and stable colorants.

Application

• Primary intermediate for the synthesis of direct dyes and acid dyes used in textile dyeing, particularly for cotton, wool, and nylon.
• Key precursor in the production of pigments for printing inks, including those used in packaging and publications.
• Used in the manufacture of colorants for leather finishing and paper coloration.
• Intermediate for specialized dyes applied in biological staining and histology within life science research.
• Potential use in the synthesis of functional dyes for optical data storage or other advanced material applications.
• Starting material for creating colorants used in wood stains and other industrial coating systems.

Basic Information

Item	Details
Product Name	3-[[4-[(1-Hydroxy-6-Phenylamino-3-Sodiosulfo-2-Naphthalenyl)Azo]-1-Naphthalenyl]Azo]Naphthalene-1,5-Disulfonic Acid Disodium Salt
CAS No.	6369-29-5
Molecular Formula	C36H23N5Na2O10S3
Molecular Weight	843.76 g/mol
Synonyms	Direct Black 38 (principal commercial name); C.I. 30235; Azo Black; Pontamine Black E; Benzamine Black E; 1,5-Naphthalenedisulfonic acid, 3-[[4-[(1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-, disodium salt; 3-[[4-[(1-Hydroxy-6-anilino-3-sulfo-2-naphthyl)azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid disodium salt
EINECS	228-895-0

Quality Control

Our production of this azo dye intermediate adheres to strict quality management systems to ensure batch-to-batch consistency and purity. Every 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 each shipment 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 a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product stability and handling properties.

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%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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