Description

4-[[4-[(2-Hydroxy-1-Naphthalenyl)Azo]-3-Methylphenyl]Azo]-3-Methylbenzenesulfonic Acid Sodium Salt is a high-purity, water-soluble azo dye intermediate of significant commercial importance. Its value lies in its role as a critical precursor for synthesizing a range of vivid and stable dyes and pigments. This compound is essential for manufacturers in the textile, ink, and specialty coatings industries seeking to produce high-performance colorants.

Application

• Primary intermediate for the synthesis of azo dyes and pigments, particularly for textile fibers like cotton, wool, and nylon.
• Key component in the production of printing inks for packaging, publications, and security applications.
• Used in the formulation of industrial coatings and paints requiring specific color fastness and chemical resistance.
• Potential use as a colorant for specialty papers and decorative laminates.
• Employed in research and development for novel functional dyes with applications in electronics or sensors.
• Acts as a starting material for lake pigments used in cosmetics and plastics, subject to appropriate purity and regulatory compliance.

Basic Information

Product Name	4-[[4-[(2-Hydroxy-1-Naphthalenyl)Azo]-3-Methylphenyl]Azo]-3-Methylbenzenesulfonic Acid Sodium Salt
CAS No.	6406-58-2
Molecular Formula	C24H19N4NaO4S
Molecular Weight	482.49 g/mol
Synonyms	Sodium 4-[[4-[(2-hydroxy-1-naphthyl)azo]-3-methylphenyl]azo]-3-methylbenzenesulfonate; C.I. Acid Orange 20; Acid Orange 20; 2-Naphthol Orange; Wool Orange A; Naphthol Orange; Eriochrome Orange AS; C.I. 14600; 4-[(4-[(2-Hydroxy-1-naphthalenyl)azo]-3-methylphenyl)azo]-3-methylbenzenesulfonic acid sodium salt
EINECS	229-058-6

Quality Control

Our production of this azo dye intermediate adheres to stringent quality control protocols to ensure batch-to-batch consistency and high purity. Every lot is tested against established specifications for identity, assay, and impurity profiles. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each 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 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 performance and handling.

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 3.0%

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