Description

7-Amino-4-Hydroxy-3-[(7-Sulpho-1-Naphthyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its core value lies in its role as a key precursor for synthesizing vibrant and stable acid dyes and reactive dyes, particularly for textile applications. This compound is essential for manufacturers and R&D facilities in the dye and pigment industry seeking to produce high-performance colorants for nylon, wool, silk, and leather.

Application

• Primary Intermediate for Acid Dyes: A crucial building block in the synthesis of acid dyes used for coloring protein fibers like wool, silk, and nylon.
• Reactive Dye Synthesis: Used in the production of reactive dyes that form covalent bonds with cellulose fibers such as cotton and rayon, offering excellent wash-fastness.
• Leather Dyeing: Employed in the formulation of dyes for the leather tanning and finishing industry.
• Paper Coloring: Can be utilized in the manufacture of dyes for specialty paper products.
• Ink Formulation: Serves as a colorant component in the production of certain inks.
• Research & Development: Used in chemical research for developing new chromophores and studying azo dye chemistry.
• Biological Staining: Potential application as a staining agent in histology and microscopy due to its chromophoric properties.

Basic Information

Product Name	7-Amino-4-Hydroxy-3-[(7-Sulpho-1-Naphthyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt
CAS No.	75627-21-3
Molecular Formula	C20H13N3Na2O8S2
Molecular Weight	549.44 g/mol
Synonyms	Acid Red 337; C.I. 17200; 7-Amino-4-hydroxy-3-[(7-sulfo-1-naphthalenyl)azo]-2-naphthalenesulfonic acid, disodium salt; 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[(7-sulfo-1-naphthalenyl)azo]-, disodium salt; Disodium 7-amino-4-hydroxy-3-[(7-sulphonato-1-naphthyl)azo]naphthalene-2-sulphonate; Azo dye intermediate 75627-21-3
EINECS	Contact for details

Quality Control

Our 7-Amino-4-Hydroxy-3-[(7-Sulpho-1-Naphthyl)Azo]Naphthalene-2-Sulphonic Acid, Sodium Salt is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for dye intermediate applications. Certificates of Analysis (COA) detailing purity, impurity profile, and physical characteristics are provided to guarantee batch-to-batch consistency and supply reliability.

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). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content	≤ 5.0%
Sulfated Ash	Contact for details
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.