Description

6-Hydroxy-5-[[3-Methyl-4-[(4-Phenoxy-3-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its primary value lies in its role as a key precursor for synthesizing a range of vivid and stable azo dyes and pigments, particularly for applications requiring specific color fastness and solubility properties. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries who require reliable, consistent-quality intermediates for their production processes.

Application

• Primary Intermediate for Azo Dyes: Serves as a crucial building block in the synthesis of acid dyes, direct dyes, and reactive dyes used for coloring nylon, silk, wool, and paper.
• Textile Industry: Used in the production of dyes for textile fibers, providing good wash and light fastness properties.
• Ink Manufacturing: A key component in the formulation of printing inks, especially for packaging and publications, due to its solubility and color strength.
• Leather Dyeing: Employed in the production of dyes for leather finishing, offering deep, uniform shades.
• Specialty Coatings and Paints: Used to create specific colorants for industrial and artistic paints where water solubility is an advantage.
• Biological Staining (Research Grade): High-purity grades may be utilized as a histological stain or indicator in laboratory research settings.
• Plastics and Polymers: Can be incorporated as a colorant for certain types of plastics and polymers during manufacturing.

Basic Information

Item	Details
Product Name	6-Hydroxy-5-[[3-Methyl-4-[(4-Phenoxy-3-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium Salt
CAS No.	6459-99-0
Molecular Formula	C29H20N4Na2O8S2
Molecular Weight	678.60 g/mol
Synonyms	Acid Red 337; C.I. 17210; Sodium 6-hydroxy-5-{[3-methyl-4-[(4-phenoxy-3-sulfonatophenyl)diazenyl]phenyl]diazenyl}naphthalene-2-sulfonate; 6-Hydroxy-5-((3-methyl-4-((4-phenoxy-3-sulfophenyl)azo)phenyl)azo)-2-naphthalenesulfonic acid disodium salt; Azo dye intermediate 6459-99-0; 2-Naphthalenesulfonic acid, 6-hydroxy-5-((3-methyl-4-((4-phenoxy-3-sulfophenyl)azo)phenyl)azo)-, disodium salt
EINECS	229-265-8

Quality Control

Our production of 6-Hydroxy-5-[[3-Methyl-4-[(4-Phenoxy-3-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium Salt adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength, and identification via IR and NMR, to ensure it meets precise customer specifications and industry standards. A detailed Certificate of Analysis (COA) documenting identity, purity, and impurity profiles is provided with each shipment to guarantee traceability and consistency for your manufacturing processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0% (Typical 97-99%)
Water Content (KF)	≤ 5.0%
pH (1% Solution)	6.0 - 8.0
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.