Description

Disodium 4-[[2,4-Dihydroxy-5-[(2-Hydroxy-3,5-Dinitrophenyl)Azo]-3-[(4-Nitrophenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonate is a high-purity, synthetic azo dye intermediate of significant industrial importance. Its complex polyazo structure provides excellent chromophoric properties, making it a critical precursor for the production of high-performance dyes and pigments. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to develop vibrant, colorfast products.

Application

• Primary Intermediate for Dye Synthesis: Serves as a key building block in the manufacture of complex azo dyes for textiles (cotton, wool, silk) and leather.
• Pigment Production: Used in the synthesis of high-grade organic pigments for plastics, paints, and coatings, offering good lightfastness and thermal stability.
• Specialty Inks: A crucial component in formulating specialty printing inks, including those for security applications and high-value packaging.
• Research & Development: Employed in chemical research for developing new chromophores and studying azo coupling reactions and dye properties.
• Analytical Reagents: Can be utilized as a staining agent or colorimetric indicator in specific laboratory and analytical procedures.

Basic Information

Item	Details
Product Name	Disodium 4-[[2,4-Dihydroxy-5-[(2-Hydroxy-3,5-Dinitrophenyl)Azo]-3-[(4-Nitrophenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonate
CAS No.	6637-87-2
Molecular Formula	C34H18N8Na2O17S2
Molecular Weight	912.67 g/mol
Synonyms	Direct Brown 2; C.I. 22311; Azo Brown 2; Disodium 5-hydroxy-6-[(2-hydroxy-3,5-dinitrophenyl)azo]-1-[(4-nitrophenyl)azo]-3-[(4-sulfonato-1-naphthyl)azo]naphthalene-2,7-disulfonate; 6637-87-2; C.I. Direct Brown 2; Direct Brown 2, disodium salt; Azo dye intermediate 6637-87-2
EINECS	229-637-5

Quality Control

Our production of Disodium 4-[[2,4-Dihydroxy-5-[(2-Hydroxy-3,5-Dinitrophenyl)Azo]-3-[(4-Nitrophenyl)Azo]Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonate adheres to a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with agreed specifications. Certificates of Analysis (COA) documenting all critical parameters are provided with each shipment.

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. The container must be kept tightly closed to protect from moisture.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Loss on Drying	Max. 5.0%
Sulfated Ash	Contact for details
Heavy Metals (as Pb)	Max. 20 ppm
Solubility (in Water)	Partially soluble, forms a colored solution

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