Description

Disodium 4,4'-[(4,6-Diamino-1,3-Phenylene)Bis(Azo)]Bisnaphthalene-1-Sulphonate is a high-purity, synthetic azo dye intermediate known for its distinct chromophoric properties. This compound is critical for ensuring consistent color strength and batch-to-batch reproducibility in demanding manufacturing processes. It is primarily utilized by producers of specialized dyes, pigments, and colorants for textiles, inks, and analytical reagents. Our supply is backed by stringent quality control to meet the exacting standards of industrial and research applications.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of direct, acid, and reactive dyes for textile coloring.
• Pigment Manufacturing: Used in the production of high-performance organic pigments for inks, paints, and plastics.
• Biological Staining: Employed in the formulation of histological stains and cytological dyes for laboratory diagnostics.
• Analytical Chemistry: Functions as a colorimetric indicator or reagent in various chemical analysis and testing procedures.
• Specialty Inks: A component in the manufacture of inks for security printing, digital printing, and specialty coatings.
• Research & Development: Used as a standard or precursor in chemical research exploring new chromophores and dye-sensitized materials.

Basic Information

Product Name	Disodium 4,4'-[(4,6-Diamino-1,3-Phenylene)Bis(Azo)]Bisnaphthalene-1-Sulphonate
CAS No.	5850-05-5
Molecular Formula	C26H18N6Na2O6S2
Molecular Weight	628.56 g/mol
Synonyms	Direct Black 19 (disodium salt); C.I. 35255; 4,4'-[(4,6-Diamino-1,3-phenylene)bis(azo)]bis[5-hydroxy-2,7-naphthalenedisulfonic acid] disodium salt; Pontamine Black E; Azo Black; Diamine Black BH; 1,3-Benzenediamine, 4,4'-[1,3-phenylenebis(azo)]bis[5-hydroxy-, disodium salt; Benzenesulfonic acid, 4,4'-(4,6-diamino-1,3-phenylene)bis(azo)di-, disodium salt
EINECS	227-450-8

Quality Control

Every batch of Disodium 4,4'-[(4,6-Diamino-1,3-Phenylene)Bis(Azo)]Bisnaphthalene-1-Sulphonate is manufactured and tested under a strict quality management system. We provide comprehensive Certificates of Analysis (COA) detailing purity, identity, and impurity profiles to ensure it meets your specific application requirements. Our quality protocols are designed to support compliance with REACH and other relevant global regulatory frameworks.

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). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

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

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