Description

4-Hydroxy-3-[[1-Sulfo-6-[[2-(Sulfooxy)Ethyl]Sulfonyl]-2-Naphtyl]Azo]-2,7-Naphthalenedisulfonic Acid is a high-purity, polyfunctional azo dye intermediate of significant commercial importance. Its complex molecular structure, featuring multiple sulfonic acid and sulfonyl groups, makes it a key precursor for synthesizing reactive and acid dyes with excellent water solubility and fiber affinity. This compound is essential for manufacturers in the textile, leather, and specialty chemical industries seeking to produce vibrant, wash-fast colorants.

Application

• Primary intermediate for Reactive Dyes: Used in the synthesis of high-grade reactive dyes for cotton, viscose, and other cellulosic fibers.
• Manufacture of Acid Dyes: Serves as a crucial building block for acid dyes applied to wool, silk, and nylon.
• Leather Coloring Agent: Employed in the production of dyes for high-quality leather finishing.
• Paper Dye Synthesis: Used in the manufacture of dyes for specialty paper products.
• Research & Development: A valuable compound for R&D in novel chromophores and functional dye chemistry.
• Specialty Ink Formulation: Can be utilized in developing specialized inks requiring specific solubility and color properties.

Basic Information

Product Name	4-Hydroxy-3-[[1-Sulfo-6-[[2-(Sulfooxy)Ethyl]Sulfonyl]-2-Naphtyl]Azo]-2,7-Naphthalenedisulfonic Acid
CAS No.	72987-40-7
Molecular Formula	C22H16N2O15S4
Molecular Weight	692.62 g/mol
Synonyms	Acid Red 337; C.I. 17200; 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-((1-sulfo-6-((2-(sulfooxy)ethyl)sulfonyl)-2-naphthalenyl)azo)-; Reactive Red 180 intermediate; 4-Hydroxy-3-((1-sulfo-6-((2-(sulfooxy)ethyl)sulfonyl)-2-naphthyl)azo)-2,7-naphthalenedisulfonic acid; 72987-40-7 (CAS); Azo dye intermediate AR-337
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-3-[[1-Sulfo-6-[[2-(Sulfooxy)Ethyl]Sulfonyl]-2-Naphtyl]Azo]-2,7-Naphthalenedisulfonic Acid is produced under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistent performance, and compliance with industry specifications for dye intermediates. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with each shipment to guarantee traceability and 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 a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content (KF)	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Freely soluble

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