Description

3-[[4-[(2-Hydroxy-5-Methylphenyl)Azo]-1-Naphthyl]Azo]Benzenesulphonic Acid is a high-purity azo dye intermediate, also known as a diazo component, valued for its ability to impart vibrant and stable color properties. Its primary commercial value lies in the synthesis of complex, high-performance dyes and pigments for demanding industrial applications. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce colors with excellent fastness and consistency.

Application

• Primary intermediate for the synthesis of azo dyes and pigments used in textile coloration.
• Key component in the production of high-performance inks for packaging and commercial printing.
• Used in the formulation of specialty industrial coatings and colorants for plastics.
• Acts as a precursor in research and development of novel chromophores and functional dyes.
• Potential use in the manufacturing of colorants for leather and paper products.
• Employed in analytical chemistry as a reagent or standard for method development and calibration.

Basic Information

Product Name	3-[[4-[(2-Hydroxy-5-Methylphenyl)Azo]-1-Naphthyl]Azo]Benzenesulphonic Acid
CAS No.	63251-41-2
Molecular Formula	C23H17N4O4S
Molecular Weight	445.47 g/mol
Synonyms	Benzenesulfonic acid, 3-[[4-[(2-hydroxy-5-methylphenyl)azo]-1-naphthalenyl]azo]-; C.I. 12715; Acid Orange 67; 3-[(4-[(2-Hydroxy-5-methylphenyl)azo]-1-naphthyl)azo]benzenesulfonic acid; 2-Hydroxy-5-methyl-4-[(4-[(3-sulfophenyl)azo]-1-naphthyl]azo]benzene; Azo dye intermediate OA-67; 63251-41-2
EINECS	Contact for details

Quality Control

Every batch of our 3-[[4-[(2-Hydroxy-5-Methylphenyl)Azo]-1-Naphthyl]Azo]Benzenesulphonic Acid is produced and tested under a strict quality management system. We ensure compliance with relevant industry specifications for dye intermediates. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to guarantee batch-to-batch consistency and performance in your synthesis 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 quality and handling.

Specification

Item	Specification
Appearance	Orange to brown powder or crystalline solid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
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.