Description

7-Hydroxy-8-[[2-Sodiosulfo-4-[(4-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt 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 acid dyes and reactive dyes. This compound is essential for manufacturers in the textile, leather, and specialty ink industries seeking to produce high-quality coloring agents with excellent fastness properties.

Application

• Primary Intermediate for Acid Dyes: A crucial building block in the synthesis of acid dyes used for coloring nylon, silk, wool, and modified acrylic fibers.
• Reactive Dye Synthesis: Used in the production of reactive dyes that form covalent bonds with cellulose fibers like cotton, rayon, and linen, ensuring superior wash-fastness.
• Leather Dyeing: Employed in the formulation of dyes for the leather tanning and finishing industry.
• Paper Coloring: Suitable for the manufacture of dyes used in specialty paper and paperboard products.
• Ink Formulation: Acts as a colorant intermediate for certain types of inks, including those for ink-jet printing and security applications.
• Research & Development: Serves as a standard or starting material in chemical research for developing new chromophores and functional dyes.

Basic Information

Product Name	7-Hydroxy-8-[[2-Sodiosulfo-4-[(4-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt
CAS No.	6226-75-1
Molecular Formula	C22H13N4Na3O10S3
Molecular Weight	690.51 g/mol
Synonyms	Acid Red 337; C.I. 17200; 7-Hydroxy-8-((2-sulfo-4-((4-sulfophenyl)azo)phenyl)azo)naphthalene-1-sulfonic acid trisodium salt; Trisodium 7-hydroxy-8-[2-sulfo-4-[(4-sulfophenyl)azo]phenylazo]naphthalene-1-sulfonate; 1-Naphthalenesulfonic acid, 7-hydroxy-8-[[2-sulfo-4-[(4-sulfophenyl)azo]phenyl]azo]-, trisodium salt; C.I. Acid Red 337; Reactive Red Dye Intermediate; Azo Dye Intermediate RR Type
EINECS	228-324-4

Quality Control

Our production of 7-Hydroxy-8-[[2-Sodiosulfo-4-[(4-Sodiosulfophenyl)Azo]Phenyl]Azo]Naphthalene-1-Sulfonic Acid Sodium Salt adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and spectrophotometry for color strength, to ensure consistency and performance for dye synthesis. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are provided to guarantee traceability and compliance with your technical requirements.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and handling properties. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%
pH (1% Solution)	6.0 - 8.0

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