Description

4-Hydroxy-7-[[[[5-Hydroxy-6-[(o-Tolyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-[(2-Methyl-4-Sulphophenyl)Azo]Naphthalene-2-Sulphonic 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 vibrant and stable colors, making it a critical component in the synthesis of specialized dyes and pigments. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries for producing high-performance colorants.

Application

• Textile Dyeing: A key intermediate for synthesizing reactive and direct dyes for cotton, wool, and nylon fibers.
• Ink Formulation: Used in the production of pigments for industrial inks, including packaging and textile printing inks.
• Specialty Coatings: Employed in creating colored coatings for plastics, papers, and other substrates requiring high color strength.
• Liquid Crystal Display (LCD) Color Filters: Potential use in the manufacture of high-purity colorants for electronic displays.
• Biological Staining: May serve as a precursor for histological stains in laboratory and diagnostic applications.
• Research & Development: Utilized as a standard or building block in chemical research for developing new chromophores and functional materials.

Basic Information

Product Name	4-Hydroxy-7-[[[[5-Hydroxy-6-[(o-Tolyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-[(2-Methyl-4-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt
CAS No.	83232-32-0
Molecular Formula	C35H24N6O11S3•Na
Molecular Weight	Contact for details
Synonyms	Acid Red 337 (sodium salt); C.I. 17200; 7-[[[[5-Hydroxy-6-[(2-methylphenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-4-hydroxy-3-[(2-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonic acid, sodium salt; Sodium 4-hydroxy-3-[(2-methyl-4-sulfophenyl)azo]-7-[[[[5-hydroxy-6-[(2-methylphenyl)azo]-7-sulfo-2-naphthyl]amino]carbonyl]amino]-2-naphthalenesulfonate; Azo dye intermediate 83232-32-0; Trisodium 4-hydroxy-3-[(2-methyl-4-sulphophenyl)azo]-7-[[[5-hydroxy-6-[(2-methylphenyl)azo]-7-sulpho-2-naphthyl]carbamoyl]amino]naphthalene-2-sulphonate
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-7-[[[[5-Hydroxy-6-[(o-Tolyl)Azo]-7-Sulpho-2-Naphthyl]Amino]Carbonyl]Amino]-3-[(2-Methyl-4-Sulphophenyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt adheres to stringent quality protocols to ensure batch-to-batch consistency and performance. The material is manufactured under a cGMP-compliant quality management system and is supported by a comprehensive Certificate of Analysis (COA) for each lot, detailing purity, identity, and impurity profiles. We ensure compliance with relevant global regulatory frameworks, including REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and should be kept away from strong oxidizing agents.

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	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%
Solubility (in Water)	Freely soluble

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