Description

2-[(2-Hydroxy-1-Naphthyl)Azo]-5-Methylbenzenesulphonic Acid is a high-purity azo dye intermediate essential for producing vibrant and stable colorants. Its value lies in its precise molecular structure, which enables the synthesis of high-performance pigments and dyes with excellent lightfastness and chemical resistance. This compound is a critical raw material for manufacturers in the textile, ink, and specialty coatings industries seeking reliable and consistent quality for their formulations.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-performance orange, red, and brown azo colorants.
• Textile Dyeing: Used in the production of dyes for coloring natural and synthetic fibers, valued for color strength and wash-fastness.
• Printing Inks: Incorporated into formulations for packaging, publication, and specialty inks requiring vivid hues and stability.
• Industrial Coatings & Paints: Employed in creating pigments for automotive, architectural, and industrial coatings that demand durability.
• Plastics and Polymers Coloring: Used in masterbatch production for uniformly coloring plastics during manufacturing.
• Research & Development: Serves as a standard or reagent in chemical research for developing new colorant molecules and studying azo chemistry.

Basic Information

Product Name	2-[(2-Hydroxy-1-Naphthyl)Azo]-5-Methylbenzenesulphonic Acid
CAS No.	37498-62-7
Molecular Formula	C₁₇H₁₄N₂O₄S
Molecular Weight	342.37 g/mol
Synonyms	5-Methyl-2-[(2-hydroxy-1-naphthyl)azo]benzenesulfonic acid; C.I. 15865; Acid Orange 20 intermediate; Benzenesulfonic acid, 5-methyl-2-[(2-hydroxy-1-naphthalenyl)azo]-; 2-Hydroxy-1-naphthylazo-5-methylbenzenesulfonic acid; 1-Naphthol-2-azo-4-methylbenzenesulfonic acid; Azo dye intermediate OA-20
EINECS	Contact for details

Quality Control

Our 2-[(2-Hydroxy-1-Naphthyl)Azo]-5-Methylbenzenesulphonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise chemical identity, purity, and composition specifications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided to guarantee batch-to-batch consistency 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 (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	Orange to red-brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%, Total impurities ≤ 2.0%
Solubility	Soluble in alkaline aqueous solutions, ethanol; slightly soluble in water

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