Description

Disodium 5-[[2,4-Dihydroxy-5-[(2-Hydroxy-3,5-Dinitrophenyl)Azo]Phenyl]Azo]-4-Hydroxy-3-[(4-Nitrophenyl)Azo]Naphthalene-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 producing vivid and stable colorants. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to develop high-performance dyes and pigments with specific shade and fastness requirements.

Application

• Primary Intermediate for Dye Synthesis: A key building block in the manufacture of high-grade, polyazo direct dyes and acid dyes for textiles like wool, silk, and nylon.
• Pigment Manufacturing: Used in the production of organic pigments for inks, including printing inks and packaging inks, where color strength and stability are paramount.
• Specialty Coatings and Paints: Employed in formulating industrial and automotive coatings that require specific, durable color properties.
• Leather Dyeing: Acts as an intermediate for dyes used in the leather tanning and finishing industry.
• Paper Coloring: Utilized in the synthesis of dyes for specialty paper products.
• Research & Development: Serves as a valuable chemical entity in R&D laboratories for developing novel chromophores and studying azo chemistry.

Basic Information

Product Name	Disodium 5-[[2,4-Dihydroxy-5-[(2-Hydroxy-3,5-Dinitrophenyl)Azo]Phenyl]Azo]-4-Hydroxy-3-[(4-Nitrophenyl)Azo]Naphthalene-2,7-Disulphonate
CAS No.	70210-25-2
Molecular Formula	C34H18N8Na2O17S2
Molecular Weight	912.66 g/mol
Synonyms	Acid Black 210; C.I. 300310; Disodium 4-hydroxy-3-[(4-nitrophenyl)azo]-5-[[2,4-dihydroxy-5-[(2-hydroxy-3,5-dinitrophenyl)azo]phenyl]azo]naphthalene-2,7-disulfonate; Polyazo Black Dye Intermediate; 2,7-Naphthalenedisulfonic acid, 5-[[2,4-dihydroxy-5-[(2-hydroxy-3,5-dinitrophenyl)azo]phenyl]azo]-4-hydroxy-3-[(4-nitrophenyl)azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our Disodium 5-[[2,4-Dihydroxy-5-[(2-Hydroxy-3,5-Dinitrophenyl)Azo]Phenyl]Azo]-4-Hydroxy-3-[(4-Nitrophenyl)Azo]Naphthalene-2,7-Disulphonate is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistent chroma value, and batch-to-batch reproducibility, meeting the exacting standards of industrial dye synthesis. Comprehensive Certificates of Analysis (COA) detailing purity, impurity profile, and physical specifications 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.

Specification

Item	Specification
Appearance	Dark brown to black powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Ash Content (Sulfated)	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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