Description

2-Hydroxy-5-[4'-[2,6-Diamino-3-Methyl-5-(p-Sulfophenylazo)Phenylazo]-3,3'-Dimethyl-4-Biphenylylazo]Benzoic Acid Dilithium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its complex poly-azo structure is engineered to deliver exceptional color strength and specific functional properties in advanced applications. This compound is primarily sought by manufacturers in the textile, ink, and specialty polymer industries for producing high-performance colorants and functional materials.

Application

• Textile Dyeing: As a key intermediate for synthesizing reactive and direct dyes for cotton, wool, and nylon, offering excellent wash and light fastness.
• Inkjet Inks: Used in the formulation of high-quality pigment inks for industrial and photographic printing due to its color purity and solubility.
• Functional Polymers: Incorporated into polymers to impart specific optical or electronic properties for advanced material science applications.
• Liquid Crystal Displays (LCDs): Potential use as a dichroic dye or color filter component in display technologies.
• Biological Staining: In research and diagnostics as a specialized stain for histological or cytological analysis.
• Analytical Chemistry: Employed as a chromogenic agent or indicator in specific spectrophotometric methods.

Basic Information

Product Name	2-Hydroxy-5-[4'-[2,6-Diamino-3-Methyl-5-(p-Sulfophenylazo)Phenylazo]-3,3'-Dimethyl-4-Biphenylylazo]Benzoic Acid Dilithium Salt
CAS No.	73718-61-3
Molecular Formula	C39H30Li2N8O7S
Molecular Weight	772.7 g/mol (approx.)
Synonyms	Acid Red 337 (Lithium Salt); C.I. 18760; Dilithium 2-hydroxy-5-[(E)-[4-[(E)-[2,6-diamino-3-methyl-5-[(E)-2-(4-sulfonatophenyl)diazen-1-yl]phenyl]diazen-1-yl]-3,3'-dimethyl-[1,1'-biphenyl]-4-yl]diazen-1-yl]benzoate; Polyazo Dye Intermediate 73718-61-3; Benzoic acid, 2-hydroxy-5-[4'-[2,6-diamino-3-methyl-5-[(4-sulfophenyl)azo]phenylazo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-, dilithium salt
EINECS	Contact for details

Quality Control

Our production of 2-Hydroxy-5-[4'-[2,6-Diamino-3-Methyl-5-(p-Sulfophenylazo)Phenylazo]-3,3'-Dimethyl-4-Biphenylylazo]Benzoic Acid Dilithium Salt adheres to a stringent quality management system. 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 and can be tailored to meet specific regulatory or internal quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled 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. Keep away from incompatible materials.

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.