Description

3,6-Bis[(4-Bromo-2-Sulphophenyl)Azo]-4,5-Dihydroxynaphthalene-2,7-Disulphonic Acid is a high-purity, complex azo dye intermediate of significant industrial importance. Its value lies in its precise molecular structure, which is engineered to impart specific color and performance characteristics in advanced dye synthesis. This compound is essential for manufacturers and R&D laboratories in the textile, specialty ink, and analytical reagent sectors seeking consistent quality and reliable supply for their production processes.

Application

• Primary intermediate for the synthesis of high-performance, polyazo direct dyes and reactive dyes for textiles.
• Key precursor in the manufacturing of specialized dyes for paper coloring and leather finishing.
• Used in the formulation of colorants for specialty inks, including inks for security printing applications.
• Acts as a complexometric reagent or indicator in specific analytical chemistry procedures.
• Employed in research and development for creating novel chromophores with tailored light-fastness and solubility properties.
• Potential use as a staining agent in biological or histological studies due to its chelating properties.

Basic Information

Product Name	3,6-Bis[(4-Bromo-2-Sulphophenyl)Azo]-4,5-Dihydroxynaphthalene-2,7-Disulphonic Acid
CAS No.	16091-04-6
Molecular Formula	C22H12Br2N4O12S4
Molecular Weight	812.41 g/mol
Synonyms	Acid Black 210; C.I. 30027; 3,6-Bis[(4-bromo-2-sulfophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid; 4,5-Dihydroxy-3,6-bis[(4-bromo-2-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid; Direct Black 166; Polyazo Black Dye Intermediate; Brominated Azo Dye Intermediate; Tetrasulfonated Azo Compound
EINECS	240-225-4

Quality Control

Our production of 3,6-Bis[(4-Bromo-2-Sulphophenyl)Azo]-4,5-Dihydroxynaphthalene-2,7-Disulphonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity. The material is characterized using advanced analytical techniques including HPLC, UV-Vis, and elemental analysis. A comprehensive Certificate of Analysis (COA) detailing purity, impurity profile, and physical specifications is provided with every shipment to support your quality assurance and regulatory needs.

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). Keep away from strong oxidizing agents and incompatible materials. Due to its complex organic structure, prolonged exposure to elevated temperatures or humidity should be avoided to maintain stability.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility	Soluble in water, alkaline solutions

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