Description

Disodium 3-[[4-[[4-[Ethyl[(4-Sulphonatophenyl)Methyl]Amino]Phenyl]Azo]-1-Naphthyl]Azo]Benzenesulphonate is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its value lies in its role as a key precursor for synthesizing vibrant and stable dyes and pigments, particularly in the textile and specialty ink industries. This compound is essential for manufacturers and R&D facilities requiring a reliable, high-quality building block for colorant production, ensuring consistent batch-to-batch performance and color fidelity.

Application

• Primary Intermediate for Dyes & Pigments: A crucial precursor in the synthesis of acid dyes, direct dyes, and reactive dyes used for coloring nylon, silk, wool, and paper.
• Textile Industry: Used in the manufacturing of dyes for textile fibers, providing excellent wash and light fastness properties.
• Specialty Inks: Serves as a key component in the formulation of high-performance inks for inkjet printing and other specialty applications.
• Leather Coloring: Employed in the production of dyes for the leather tanning and finishing industry.
• Research & Development: Used as a standard or building block in chemical research for developing new chromophores and functional materials.
• Biological Staining: Potential use as a staining agent or in the synthesis of stains for histological and cytological applications.

Basic Information

Product Name	Disodium 3-[[4-[[4-[Ethyl[(4-Sulphonatophenyl)Methyl]Amino]Phenyl]Azo]-1-Naphthyl]Azo]Benzenesulphonate
CAS No.	72207-98-8
Molecular Formula	C33H28N5Na2O7S2
Molecular Weight	707.70 g/mol
Synonyms	Acid Red 337; C.I. 17200; Disodium 5-[[4-[(4-ethylamino-3-sulfonatophenyl)azo]-1-naphthyl]azo]salicylate (related isomer); Benzenesulfonic acid, 3-[[4-[[4-[ethyl[(4-sulfophenyl)methyl]amino]phenyl]azo]-1-naphthalenyl]azo]-, disodium salt; Azo dye intermediate 72207-98-8; 3-[[4-[[4-[Ethyl[(4-sulfophenyl)methyl]amino]phenyl]azo]-1-naphthyl]azo]benzenesulfonic acid disodium salt
EINECS	Contact for details

Quality Control

Our Disodium 3-[[4-[[4-[Ethyl[(4-Sulphonatophenyl)Methyl]Amino]Phenyl]Azo]-1-Naphthyl]Azo]Benzenesulphonate is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for use in sensitive dye synthesis. Certificates of Analysis (COA) documenting purity, heavy metal content, and other critical parameters 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, well-ventilated area at room temperature (15-25°C). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption and degradation.

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	≤ 1.0%
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.