Description

Disodium 6-Amino-5-[[5-(Benzoylamino)-2-Sulphonatophenyl]Azo]-4-Hydroxynaphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate known for its excellent chromophoric properties. This compound is critical for producing vibrant and stable colorants, offering superior light and wash fastness in final applications. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for synthesizing high-performance dyes and pigments.

Application

• Primary intermediate for the synthesis of acid dyes and direct dyes used in textile coloring, particularly for wool, silk, and nylon.
• Key precursor in the production of reactive dyes for cotton and cellulose fibers, ensuring strong covalent bonding.
• Used in manufacturing pigments and lake colors for inks, including printing inks and writing inks.
• Employed in the formulation of specialty colorants for paper, leather, and food packaging materials.
• Acts as a chromogenic agent in analytical chemistry and biological staining applications.
• Potential use in the research and development of functional dyes for optical sensors and non-linear optical materials.

Basic Information

Product Name	Disodium 6-Amino-5-[[5-(Benzoylamino)-2-Sulphonatophenyl]Azo]-4-Hydroxynaphthalene-2-Sulphonate
CAS No.	36525-74-3
Molecular Formula	C23H16N4Na2O9S2
Molecular Weight	610.50 g/mol
Synonyms	Acid Red 337; C.I. 17200; Disodium 6-amino-4-hydroxy-5-[[2-(benzoylamino)-5-sulfophenyl]azo]-2-naphthalenesulfonate; 6-Amino-4-hydroxy-3-[[2-[(phenylcarbonyl)amino]-5-sulfophenyl]azo]-2-naphthalenesulfonic acid disodium salt; Benzenesulfonic acid, 2-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-5-(benzoylamino)-, disodium salt; Azo Dye Intermediate 36525-74-3; C.I. Acid Red 337
EINECS	Contact for details

Quality Control

Our production of Disodium 6-Amino-5-[[5-(Benzoylamino)-2-Sulphonatophenyl]Azo]-4-Hydroxynaphthalene-2-Sulphonate adheres to stringent quality management systems to ensure batch-to-batch consistency and purity. The material is tested against rigorous in-house specifications, which typically include identification, assay, and impurity profile analysis. Certificates of Analysis (COA) detailing all test results are available upon request 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). Keep away from incompatible materials such as strong oxidizing agents. The product is light-sensitive and should be stored away from direct light exposure to maintain stability.

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.