Description

2-Chloro-5-[(2-Hydroxy-1-Naphthyl)Azo]Toluene-4-Sulphonic Acid is a specialized azo dye intermediate known for its distinct chromophoric properties. This compound matters for its role in synthesizing high-value, colorfast pigments and dyes with specific shades and performance characteristics. It is primarily needed by manufacturers in the dye and pigment, textile, and specialty chemical industries for producing materials requiring precise coloration.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-performance orange, red, and brown azo dyes and pigments.
• Textile Dyeing: Used in the production of dyes for coloring natural and synthetic fibers, valued for color strength and fastness.
• Industrial Pigments: Employed in manufacturing pigments for inks, paints, coatings, and plastics where light and weather stability are important.
• Specialty Chemical Synthesis: Acts as a precursor for more complex chromophores used in research and advanced material development.
• Laboratory Reagent: Utilized in analytical chemistry and research as a standard or reagent for colorimetric analysis and method development.

Basic Information

Product Name	2-Chloro-5-[(2-Hydroxy-1-Naphthyl)Azo]Toluene-4-Sulphonic Acid
CAS No.	15958-19-7
Molecular Formula	C17H12ClN2O4S
Molecular Weight	375.81 g/mol
Synonyms	2-Chloro-5-[(2-hydroxy-1-naphthyl)azo]toluene-4-sulfonic acid; C.I. 15865; 4-Sulfo-2-chloro-5-[(2-hydroxy-1-naphthyl)azo]toluene; 2-Chloro-5-(2-hydroxy-1-naphthylazo)-4-methylbenzenesulfonic acid; 1-Naphthol-2-azo-4'-chloro-5'-methyl-2'-sulfonic acid; Toluene-4-sulfonic acid, 2-chloro-5-[(2-hydroxy-1-naphthyl)azo]-; Acid Orange 20 (related dye class)
EINECS	240-098-5

Quality Control

Our production of 2-Chloro-5-[(2-Hydroxy-1-Naphthyl)Azo]Toluene-4-Sulphonic Acid adheres to stringent quality protocols to ensure batch-to-batch consistency and purity. All materials undergo rigorous analytical testing, including HPLC for assay and impurity profiling. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and specific test results 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Orange to red-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

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