Description

6-Amino-4-Hydroxy-3-[[7-Sulpho-4-[(4-Sulphophenyl)Azo]-1-Naphthyl]Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its multi-sulfonated structure provides excellent solubility and reactivity, making it a critical precursor for synthesizing high-value dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty chemical industries seeking to produce vibrant, stable colors.

Application

• Primary Intermediate for Reactive Dyes: A key building block in the synthesis of high-performance reactive dyes for cotton and other cellulosic fibers.
• Direct Dye Production: Used in the manufacture of direct dyes, valued for their application simplicity and good wet-fastness properties.
• Acid Dye Synthesis: Serves as a precursor for acid dyes used on polyamide fibers (nylon) and silk.
• Food, Drug, and Cosmetic (FD&C) Colorants: Potential intermediate in the production of certified colorants for regulated applications, subject to specific purity grades.
• Inkjet and Digital Printing Inks: Used to create specialized colorants for high-quality digital textile and paper printing.
• Laboratory and Research Reagent: Employed in chemical research for studying azo coupling reactions and developing new chromophores.
• Functional Dyes: Intermediate for dyes with specialized functions, such as those used in liquid crystal displays or as biological stains.

Basic Information

Product Name	6-Amino-4-Hydroxy-3-[[7-Sulpho-4-[(4-Sulphophenyl)Azo]-1-Naphthyl]Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt
CAS No.	83221-57-2
Molecular Formula	C26H16N4Na4O14S4
Molecular Weight	862.62 g/mol (for Na4 salt)
Synonyms	Acid Red 337 (sodium salt); C.I. 17200; 6-Amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]-1-naphthalenyl]azo]-2,7-naphthalenedisulfonic acid, tetrasodium salt; 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]-1-naphthalenyl]azo]-, sodium salt (1:4); Tetrasodium 6-amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]naphthalen-1-yl]azo]naphthalene-2,7-disulfonate; Reactive Red Dye Intermediate; Azo Dye Intermediate AR337
EINECS	Contact for details

Quality Control

Our 6-Amino-4-Hydroxy-3-[[7-Sulpho-4-[(4-Sulphophenyl)Azo]-1-Naphthyl]Azo]Naphthalene-2,7-Disulphonic Acid, Sodium Salt is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, composition, and performance for its intended industrial applications. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and solubility are available upon request to 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 room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 90% (typical 92-95%)
Moisture Content	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 8.0%

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