Description

4-Hydroxy-7-Phenylamino-3-[[2,5-Dimethyl-4-[(4-Methyl-2-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium Salt is a high-purity, synthetic azo dye intermediate of significant industrial importance. This compound is valued for its ability to impart vivid and stable coloration, making it a critical component in the production of specialized dyes and pigments. It is primarily sought after by manufacturers in the textile, ink, and specialty coatings industries for creating high-performance colorants.

Application

• Textile Dyeing: A key intermediate for synthesizing reactive and direct dyes used on cotton, wool, and synthetic fibers.
• Ink Formulation: Used in the manufacture of high-quality printing inks for packaging, publications, and security applications.
• Pigment Production: Serves as a precursor for creating organic pigments used in plastics, paints, and industrial coatings.
• Leather Coloring: Employed in the production of dyes for achieving durable and vibrant colors on leather goods.
• Paper Coloring: Used in the manufacture of dyes for specialty papers and paper products requiring specific color fastness.
• Research & Development: Acts as a valuable chemical building block in R&D labs for developing novel chromophores and functional dyes.

Basic Information

Item	Details
Product Name	4-Hydroxy-7-Phenylamino-3-[[2,5-Dimethyl-4-[(4-Methyl-2-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium Salt
CAS No.	6369-28-4
Molecular Formula	C31H25N5Na2O7S2
Molecular Weight	697.66 g/mol
Synonyms	Acid Red 337; C.I. 17210; Sodium 4-hydroxy-7-(phenylamino)-3-[[2,5-dimethyl-4-[(4-methyl-2-sulfonatophenyl)diazenyl]phenyl]diazenyl]naphthalene-2-sulfonate; 7-Anilino-4-hydroxy-3-[[2,5-dimethyl-4-[(4-methyl-2-sulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid, disodium salt; C.I. Acid Red 337; Azo dye intermediate 6369-28-4
EINECS	228-902-5

Quality Control

Our production of 4-Hydroxy-7-Phenylamino-3-[[2,5-Dimethyl-4-[(4-Methyl-2-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-2-Sulfonic Acid Sodium Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing all critical parameters are provided with each shipment.

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 strong oxidizing agents. The material is light-sensitive; prolonged exposure to light should be avoided to maintain product integrity.

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
Solubility (1% in Water)	Complete, clear solution

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