Description

Disodium 6-Amino-4-Hydroxy-3-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate is a high-purity, water-soluble azo dye intermediate essential for producing vivid and stable colorants. This compound matters because it provides the critical chromophore structure required for manufacturing high-performance dyes with excellent light and wash fastness properties. It is primarily needed by manufacturers in the textile, ink, and specialty chemical industries seeking reliable intermediates for creating red to violet shades. Our supply ensures consistent quality and batch-to-batch uniformity for your production processes.

Application

• Textile Dyeing: A key intermediate for synthesizing reactive and direct dyes used on cotton, wool, and nylon fibers.
• Ink Manufacturing: Used in the production of pigments for inks in packaging, printing, and writing applications.
• Leather Coloring: Serves as a precursor for dyes applied in the leather tanning and finishing industry.
• Paper Coloring: Employed in the manufacture of dyes for specialty and decorative papers.
• Biological Staining: Potential use as an intermediate for histological stains and indicators in laboratory settings.
• Research & Development: Used as a standard or building block in chemical research for novel dye and pigment synthesis.

Basic Information

Product Name	Disodium 6-Amino-4-Hydroxy-3-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate
CAS No.	83562-69-0
Molecular Formula	C22H14N6Na2O8S2
Molecular Weight	616.49 g/mol
Synonyms	Acid Red 337; C.I. 17200; Disodium 6-amino-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonate; 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-, disodium salt; 6-Amino-4-hydroxy-3-((4-((4-sulfonatophenyl)diazenyl)phenyl)diazenyl)naphthalene-2-sulfonic acid disodium salt; Azo dye intermediate RED-VIOLET; C.I. Acid Red 337
EINECS	Contact for details

Quality Control

Our Disodium 6-Amino-4-Hydroxy-3-[[4-[(4-Sulphonatophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and impurity profiles. Certificates of Analysis (COA) documenting identity, assay, and related substances 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). 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 performance.

Specification

Item	Specification
Appearance	Dark red to violet 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.