Description

7-Amino-4-Hydroxy-3-[[4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid is a high-purity, specialized azo dye intermediate essential for producing vivid and stable colorants. This compound matters for manufacturers who require precise molecular structures to achieve specific shades and performance characteristics in demanding applications. It is primarily needed by industries involved in the synthesis of dyes and pigments for textiles, inks, and specialty coatings, where color fastness and chemical consistency are critical.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments.
• Key component in manufacturing dyes for textile coloring, particularly for cotton and nylon.
• Used in the production of colorants for inks, including those for packaging and printing.
• Essential raw material for creating specialty pigments used in coatings and plastics.
• Employed in research and development for novel chromophoric systems and functional dyes.
• Potential use in the formulation of biological stains and analytical reagents.

Basic Information

Product Name	7-Amino-4-Hydroxy-3-[[4-[(4-Sulphophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonic Acid
CAS No.	63147-42-2
Molecular Formula	C22H16N6O7S2
Molecular Weight	540.53 g/mol
Synonyms	Acid Red 337; C.I. 17200; 7-Amino-4-hydroxy-3-{[4-[(4-sulfophenyl)azo]phenyl]azo}naphthalene-2-sulfonic acid; 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-; Azo Dye Intermediate AR337; 3-[[4-[(4-Sulfophenyl)azo]phenyl]azo]-7-amino-4-hydroxy-2-naphthalenesulfonic acid
EINECS	Contact for details

Quality Control

Our production of this azo dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high chemical purity. Every lot is tested against comprehensive specifications, including identity confirmation, assay, and impurity profile analysis. A Certificate of Analysis (COA) detailing all test results is provided with each shipment to support your quality assurance and regulatory compliance needs.

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 (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture.

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	≤ 1.0%
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.