Description

4-Hydroxy-3-[(4-Methoxy-2-Sulphophenyl)Azo]-7-(Methylamino)Naphthalene-2-Sulphonic Acid is a high-purity, synthetic azo dye intermediate of significant commercial importance. Its precise molecular structure is critical for producing vivid and stable colorants, particularly in applications demanding high performance and consistency. This compound is essential for manufacturers in the textile, ink, and specialty chemical sectors who require reliable intermediates for advanced dye synthesis.

Application

• Primary intermediate for the synthesis of acid dyes and reactive dyes used in textile coloring, especially for nylon, wool, and silk.
• Key precursor in manufacturing pigments and colorants for inks, including printing inks and inkjet formulations.
• Used in the production of specialty dyes for leather and paper products.
• Potential intermediate for biological stains and histological dyes in laboratory and diagnostic applications.
• Research and development of novel functional dyes with specific optical or electronic properties.
• Fine chemical synthesis where a sulphonated azo compound is required as a building block.

Basic Information

Product Name	4-Hydroxy-3-[(4-Methoxy-2-Sulphophenyl)Azo]-7-(Methylamino)Naphthalene-2-Sulphonic Acid
CAS No.	51838-10-9
Molecular Formula	C18H16N3O8S2
Molecular Weight	466.47 g/mol
Synonyms	Acid Red 337; C.I. 17210; 7-(Methylamino)-4-hydroxy-3-[(4-methoxy-2-sulfophenyl)azo]naphthalene-2-sulfonic acid; 2-Naphthalenesulfonic acid, 7-(methylamino)-4-hydroxy-3-[(4-methoxy-2-sulfophenyl)azo]-; 4-Hydroxy-3-[(4-methoxy-2-sulfophenyl)azo]-7-(methylamino)-2-naphthalenesulfonic acid; Azo dye intermediate 51838-10-9; 7-Methylamino-4-hydroxy-3-(4-methoxy-2-sulfophenylazo)naphthalene-2-sulfonic acid
EINECS	Contact for details

Quality Control

Our production of 4-Hydroxy-3-[(4-Methoxy-2-Sulphophenyl)Azo]-7-(Methylamino)Naphthalene-2-Sulphonic Acid adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing to ensure high purity, consistent composition, and batch-to-batch reliability. Certificates of Analysis (COA) detailing key parameters such as assay, impurity profile, and physical characteristics are available upon request 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 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 stability and performance.

Specification

Item	Specification
Appearance	Dark red to brown powder or crystalline solid
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)	Total impurities ≤ 3.0%
Solubility	Soluble in water; sparingly soluble in organic solvents

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