Description

Disodium 8-[[5-Anilinosulphonyl-2-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonate is a high-purity, water-soluble azo dye intermediate of significant industrial importance. Its primary value lies in its role as a key precursor for synthesizing high-performance acid dyes and reactive dyes, which are essential for coloring polyamide fibers like nylon and wool. This compound is critical for manufacturers in the textile, leather, and specialty ink industries who require consistent quality and reliable supply for their production processes.

Application

• Primary Intermediate for Acid Dyes: Essential for the synthesis of acid dyes used for dyeing and printing polyamide (nylon) and protein (wool, silk) fibers.
• Reactive Dye Synthesis: Serves as a key building block in the production of reactive dyes for cellulose fibers like cotton, providing excellent wash-fastness.
• Leather Coloring: Used in the formulation of dyes for the leather tanning and finishing industry.
• Ink and Pigment Manufacturing: A valuable component in the production of specialty inks and organic pigments.
• Research & Development: Employed in chemical R&D for developing new chromophores and studying azo dye chemistry.
• Quality Control Reference Standard: Used as a high-purity analytical standard in dye manufacturing quality assurance laboratories.

Basic Information

Product Name	Disodium 8-[[5-Anilinosulphonyl-2-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonate
CAS No.	85409-51-4
Molecular Formula	C23H16N3Na2O10S3
Molecular Weight	667.55 g/mol
Synonyms	Acid Red 337 (C.I. 17200); Disodium 8-[(5-(phenylaminosulfonyl)-2-methylphenyl)azo]-7-hydroxynaphthalene-1,3-disulfonate; 8-[[5-(Anilinosulfonyl)-2-methylphenyl]azo]-7-hydroxy-1,3-naphthalenedisulfonic acid disodium salt; C.I. Acid Red 337; Azo dye intermediate 85409-51-4; 1,3-Naphthalenedisulfonic acid, 8-[[5-(anilinosulfonyl)-2-methylphenyl]azo]-7-hydroxy-, disodium salt
EINECS	Contact for details

Quality Control

Our production of Disodium 8-[[5-Anilinosulphonyl-2-Methylphenyl]Azo]-7-Hydroxynaphthalene-1,3-Disulphonate adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee traceability and consistency.

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 (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Sulfated Ash	≤ 20.0%
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.