Description

7-Amino-4-Hydroxy-3-[2-Methoxy-4-(3-Sulfophenylazo)Phenylazo]-2-Naphthalenesulfonic Acid is a high-purity, specialized azo dye intermediate. This compound is critical for synthesizing high-value, colorfast dyes and pigments with specific optical properties. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for producing vibrant and stable colors.

Application

• Primary intermediate for the synthesis of high-performance azo dyes and pigments.
• Key component in manufacturing dyes for textile fibers, including nylon, silk, and wool.
• Used in the production of colorants for inks, including jet printing and packaging inks.
• Precursor for reactive dyes used in cotton dyeing and printing processes.
• Employed in the development of biological stains and histological dyes for laboratory and diagnostic use.
• Potential use as a chelating agent or intermediate in the synthesis of functional chemicals and optical materials.

Basic Information

Product Name	7-Amino-4-Hydroxy-3-[2-Methoxy-4-(3-Sulfophenylazo)Phenylazo]-2-Naphthalenesulfonic Acid
CAS No.	72208-30-1
Molecular Formula	C23H18N6O8S2
Molecular Weight	570.55 g/mol
Synonyms	Acid Red 337; C.I. 17200; 7-Amino-4-hydroxy-3-[[2-methoxy-4-[(3-sulfophenyl)azo]phenyl]azo]-2-naphthalenesulfonic acid; 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[[2-methoxy-4-[(3-sulfophenyl)azo]phenyl]azo]-; Azo dye intermediate 72208-30-1; 3-[(E)-[4-[(E)-(3-Sulfophenyl)diazenyl]-2-methoxyphenyl]diazenyl]-7-amino-4-hydroxynaphthalene-2-sulfonic acid
EINECS	Contact for details

Quality Control

Our production of this advanced dye intermediate adheres to strict quality control protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed to confirm identity, strength, and the absence of critical impurities. A comprehensive Certificate of Analysis (COA) detailing purity (typically >95% by HPLC), relevant physical parameters, and impurity profiles is provided with every shipment to support your quality assurance processes.

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 sealed to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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