Description

4-Amino-5-Hydroxy-3-[[4-[[[4-[(4-Hydroxyphenyl)Azo]Phenyl]Amino]Carbonyl]Phenyl]Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, polyazo dye intermediate of significant industrial importance. This compound is valued for its ability to impart intense and stable coloration, making it a critical precursor in the synthesis of specialized dyes and pigments. It is primarily sought after by manufacturers in the textile, ink, and specialty coatings industries who require consistent quality and reliable supply for their production processes.

Application

• Primary Intermediate for Azo Dyes: Serves as a key building block in the synthesis of high-performance, polyazo direct and reactive dyes for textiles, especially cotton and cellulose fibers.
• Specialty Pigment Manufacturing: Used in the production of organic pigments for inks, including packaging and printing inks, where color strength and stability are paramount.
• Industrial Coatings: Employed in the formulation of colored coatings and paints that require specific hue and durability characteristics.
• Research & Development: Utilized in chemical R&D laboratories for developing novel chromophores and studying structure-property relationships in dye chemistry.
• Paper Coloring: Potential application in the manufacture of dyes for coloring paper and paper products.
• Leather Dyeing: Can be used in the formulation of dyes for the leather tanning and finishing industry.

Basic Information

Item	Detail
Product Name	4-Amino-5-Hydroxy-3-[[4-[[[4-[(4-Hydroxyphenyl)Azo]Phenyl]Amino]Carbonyl]Phenyl]Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	83221-66-3
Molecular Formula	C41H27N7O10S2•Na2 (or related sodium salt form)
Molecular Weight	Contact for details
Synonyms	Acid Red 337; C.I. 17200; Sodium 4-amino-5-hydroxy-3-((4-((4-((4-hydroxyphenyl)diazenyl)phenyl)carbamoyl)phenyl)diazenyl)-6-(phenyldiazenyl)naphthalene-2,7-disulfonate; Polyazo dye intermediate 83221-66-3; Azo dye precursor CAS 83221-66-3; 4-Amino-5-hydroxy-3,6-bis(phenylazo)naphthalene-2,7-disulfonic acid derivative
EINECS	Contact for details

Quality Control

Our production of this dye intermediate adheres to strict quality management protocols to ensure batch-to-batch consistency and purity. Quality is verified through comprehensive analytical testing, including HPLC for purity, spectrophotometry for color strength assessment, and standard wet chemical methods. A Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with every shipment to support your quality assurance and regulatory 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 colored powder or solid
Identification (IR)	Conforms to structure
Assay (HPLC)	Min. 95%
Moisture Content	Max. 5.0%
Solubility	Soluble in water, alkaline solutions
Heavy Metals (as Pb)	Max. 20 ppm

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