Description

4,5-Dihydroxy-3-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart vivid and stable coloration, making it a critical precursor in the synthesis of specialized dyes and pigments. It is primarily required by manufacturers in the textile, ink, and specialty coatings industries seeking to develop high-performance colorants.

Application

• Textile Dyeing: A key intermediate for synthesizing acid dyes and direct dyes used on nylon, silk, wool, and paper.
• Ink Formulation: Used in the production of pigments for printing inks, including those for packaging and security applications.
• Specialty Coatings: Serves as a colorant precursor in industrial and automotive coatings requiring specific hue and lightfastness.
• Biological Staining: Potential use in the synthesis of histological stains for laboratory and diagnostic purposes.
• Functional Dyes: Intermediate for creating dyes used in optical data storage, liquid crystal displays (LCDs), and other advanced materials.
• Research & Development: Employed as a standard or building block in chemical research for novel chromophore development.

Basic Information

Product Name	4,5-Dihydroxy-3-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt
CAS No.	6226-93-3
Molecular Formula	C22H15N4NaO5S
Molecular Weight	470.43 g/mol
Synonyms	Acid Red 73; C.I. 27290; 1-Naphthalenesulfonic acid, 4,5-dihydroxy-3-((4-(phenylazo)phenyl)azo)-, monosodium salt; Sodium 4,5-dihydroxy-3-((4-(phenylazo)phenyl)azo)naphthalene-1-sulfonate; Azorubin S; Food Red 10; Carmoisine; L-Acid Red 73
EINECS	228-319-6

Quality Control

Our production of 4,5-Dihydroxy-3-[[4-(Phenylazo)Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing to ensure consistent purity, color strength, and compliance with relevant industry specifications. A detailed Certificate of Analysis (COA) documenting identity, assay, and impurity profiles is provided with each shipment to guarantee traceability and quality assurance for our B2B partners.

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). Due to its hygroscopic nature, the container must be kept sealed to prevent moisture absorption, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
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.