Description

Disodium 7-[[2,4-Dihydroxy-5-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Phenyl]Azo]-4-Hydroxynaphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart a strong, stable color and is a critical precursor in the synthesis of complex dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing high-performance colorants.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of high-value, polyazo direct and reactive dyes for textiles, especially cotton and cellulose fibers.
• Pigment Manufacturing: Used in the production of high-performance organic pigments for inks, plastics, and coatings, where color strength and stability are paramount.
• Specialty Colorants: Employed in the formulation of specialized dyes for leather, paper, and other industrial applications requiring specific hue and fastness properties.
• Research & Development: Serves as a crucial reagent in chemical R&D for developing novel chromophores and studying azo coupling reactions.
• Analytical Chemistry: Can be utilized as a standard or reagent in analytical methods for dye identification and quantification.

Basic Information

Product Name	Disodium 7-[[2,4-Dihydroxy-5-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Phenyl]Azo]-4-Hydroxynaphthalene-2-Sulphonate
CAS No.	85959-24-6
Molecular Formula	C34H22N6Na2O11S2
Molecular Weight	792.73 g/mol
Synonyms	7-[[2,4-Dihydroxy-5-[(4-[(4-Sulfophenyl)azo]phenyl)azo]phenyl]azo]-4-hydroxy-2-naphthalenesulfonic Acid Disodium Salt; Direct Brown 44 (related dye class); Azo Dye Intermediate Brown; Disodium 4-Hydroxy-7-[[5-[[4-[(4-sulfophenyl)azo]phenyl]azo]-2,4-dihydroxyphenyl]azo]-2-naphthalenesulfonate; C.I. 35005 (related); Polyazo Dye Intermediate; Tetrakisazo Dye Precursor; Water-soluble Azo Compound
EINECS	Contact for details

Quality Control

Our Disodium 7-[[2,4-Dihydroxy-5-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Phenyl]Azo]-4-Hydroxynaphthalene-2-Sulphonate is manufactured under a stringent quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye synthesis. Certificates of Analysis (COA) detailing purity, impurity profile, and physical characteristics are provided with every shipment to guarantee batch-to-batch consistency and performance reliability.

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); therefore, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark brown to black powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (typical 97-99%)
Water Content (KF)	≤ 5.0%
Solubility (1% in Water)	Complete, clear solution
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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