Description

4,4'-[(2-Methyl-5-Sodiosulfo-1,3-Phenylene)Bis[Azo(4,6-Diamino-3,1-Phenylene)Azo]]Bis[Naphthalene-1-Sulfonic Acid Sodium] Salt is a high-purity, water-soluble bisazo dye intermediate known for its excellent chromophore properties and stability. This compound is critical for synthesizing high-performance dyes and pigments that require intense color strength and superior fastness. It is primarily sought by manufacturers in the textile, ink, and specialty chemical industries for producing vibrant and durable colorants.

Application

• Primary Intermediate for Direct Dyes: Used in the synthesis of high-quality direct dyes for cotton, viscose, and other cellulosic fibers.
• Pigment Manufacturing: Serves as a key precursor for producing organic pigments used in inks, paints, and plastics.
• Textile Colorants: Essential for creating deep, wash-fast shades in textile dyeing and printing applications.
• Paper Dyeing: Employed in the production of dyes for coloring paper and paperboard.
• Leather Finishing: Used in formulations for dyeing leather goods.
• Specialty Chemical Synthesis: Acts as a building block for advanced colorants in high-tech applications.

Basic Information

Product Name	4,4'-[(2-Methyl-5-Sodiosulfo-1,3-Phenylene)Bis[Azo(4,6-Diamino-3,1-Phenylene)Azo]]Bis[Naphthalene-1-Sulfonic Acid Sodium] Salt
CAS No.	6473-05-8
Molecular Formula	C40H28N10Na4O14S4
Molecular Weight	1150.93 g/mol
Synonyms	Direct Black 19; C.I. 35255; 4,4'-[(2-Methyl-5-sulfo-1,3-phenylene)bis[azo(4,6-diamino-1,3-phenylene)azo]]bis[1-naphthalenesulfonic acid] tetrasodium salt; Direct Black BN; Pontamine Black BN; Azo Black BN; Diazol Black BN; Tetrodirect Black BN
EINECS	229-314-4

Quality Control

Our production of 4,4'-[(2-Methyl-5-Sodiosulfo-1,3-Phenylene)Bis[Azo(4,6-Diamino-3,1-Phenylene)Azo]]Bis[Naphthalene-1-Sulfonic Acid Sodium] Salt adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing, including HPLC for purity and spectrophotometry for color value, to ensure consistency and compliance with industry specifications. Certificates of Analysis (COA) detailing assay, impurity profile, and physical characteristics are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The material is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption.

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%
Water Solubility	Completely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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