Description

Disodium 4-[[2,4-Dihydroxy-3-(Phenylazo)Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonate is a high-purity, synthetic azo dye intermediate of significant commercial importance. This compound is valued for its role in producing vivid and stable colorants, particularly in shades of red and brown. It is primarily required by manufacturers in the textile, leather, and specialty ink industries for dye and pigment synthesis.

Application

• Primary Intermediate for Dyes & Pigments: Serves as a key building block in the synthesis of acid dyes, direct dyes, and reactive dyes for textile fibers like wool, silk, and nylon.
• Leather Coloring Agent: Used in the formulation of dyes for coloring leather goods, providing good penetration and color fastness.
• Specialty Ink Production: Employed in the manufacture of inks for applications requiring specific color properties and stability.
• Paper Dyeing: Applicable in the paper industry for coloring specialty papers and paper products.
• Research & Development: Used in chemical research for developing new colorants and studying azo dye chemistry and properties.

Basic Information

Product Name	Disodium 4-[[2,4-Dihydroxy-3-(Phenylazo)Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonate
CAS No.	93940-02-4
Molecular Formula	C22H14N4Na2O11S2
Molecular Weight	604.47 g/mol
Synonyms	Acid Red 299; C.I. 18130; Disodium 4-[(2,4-dihydroxy-3-phenylazophenyl)azo]-5-hydroxynaphthalene-2,7-disulphonate; 4-[[2,4-Dihydroxy-3-(phenylazo)phenyl]azo]-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt; 2,7-Naphthalenedisulfonic acid, 4-[[2,4-dihydroxy-3-(phenylazo)phenyl]azo]-5-hydroxy-, disodium salt; Azo dye intermediate 93940-02-4
EINECS	Contact for details

Quality Control

Our production of Disodium 4-[[2,4-Dihydroxy-3-(Phenylazo)Phenyl]Azo]-5-Hydroxynaphthalene-2,7-Disulphonate adheres to stringent quality management protocols to ensure batch-to-batch consistency and purity for industrial applications. All material is tested against established in-house specifications, which typically include parameters for identity, assay, and impurity profile. Certificates of Analysis (COA) documenting these results are available upon request to support your quality assurance processes.

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 incompatible materials such as strong oxidizing agents. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Dark red to brown 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.