Description

4-Amino-5-Hydroxy-3-[(4-Nitrophenyl)Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart specific color characteristics and functional properties in advanced material formulations. It is primarily required by manufacturers in the textile, ink, and specialty polymer industries for the synthesis of high-performance dyes and pigments.

Application

• Primary Intermediate for Azo Dyes: A key building block in the synthesis of complex, high-value azo dyes for textiles and leather.
• Specialty Ink Formulations: Used in the production of colorants for inks in packaging, security printing, and digital applications.
• Functional Pigment Synthesis: Serves as a precursor for pigments used in plastics, coatings, and advanced composite materials.
• Research & Development: Employed in academic and industrial R&D for developing novel chromophores and studying dye chemistry.
• Analytical Reagent: Can be utilized as a colorimetric reagent or indicator in specific analytical chemistry applications.

Basic Information

Product Name	4-Amino-5-Hydroxy-3-[(4-Nitrophenyl)Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	83006-55-7
Molecular Formula	C22H14N6Na2O10S2
Molecular Weight	656.50 g/mol
Synonyms	Acid Red 337 (C.I. 17220); Sodium 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)naphthalene-2,7-disulfonate; 2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)-, disodium salt; C.I. 17220; Disodium 4-amino-5-hydroxy-3-(4-nitrophenylazo)-6-phenylazonaphthalene-2,7-disulphonate; Azo dye intermediate 83006-55-7
EINECS	Contact for details

Quality Control

Our 4-Amino-5-Hydroxy-3-[(4-Nitrophenyl)Azo]-6-(Phenylazo)Naphthalene-2,7-Disulphonic Acid, Sodium Salt is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistent color strength, and batch-to-batch uniformity. Certificates of Analysis (COA) detailing purity, impurity profile, and physical specifications are available upon request to support your quality assurance protocols.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Solubility (in Water)	Clear solution
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.0 - 8.0

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