Description

4-[(5-Chloro-4-Methyl-2-Sulphophenyl)Azo]-3-Hydroxy-2-Naphthoic Acid is a high-purity azo dye intermediate essential for producing vibrant and stable colorants. This compound is valued for its role in synthesizing specialized pigments and dyes with excellent lightfastness and chemical resistance. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries for creating high-performance color products.

Application

• Primary Intermediate for the synthesis of high-grade azo pigments and dyes.
• Textile Dyeing, particularly for fibers requiring colorants with enhanced durability.
• Ink Formulation for printing inks where color stability is critical.
• Pigment Manufacturing for plastics, paints, and coatings.
• Research & Development of novel colorants and functional dyes.
• Specialty Chemical Synthesis as a key building block for more complex molecules.

Basic Information

Product Name	4-[(5-Chloro-4-Methyl-2-Sulphophenyl)Azo]-3-Hydroxy-2-Naphthoic Acid
CAS No.	16013-44-8
Molecular Formula	C₁₈H₁₁ClN₂O₆S
Molecular Weight	418.81 g/mol
Synonyms	5-Chloro-4-methyl-2-[(3-hydroxy-2-naphthoyl)azo]benzenesulfonic Acid; C.I. 15865; Acid Red 158; 3-Hydroxy-4-[(5-chloro-4-methyl-2-sulfophenyl)azo]-2-naphthoic Acid; Azo Dye Intermediate 16013-44-8; Benzenesulfonic acid, 5-chloro-4-methyl-2-[(3-hydroxy-2-naphthoyl)azo]-; 4-[(5-Chloro-4-methyl-2-sulfophenyl)azo]-3-hydroxy-2-naphthalenecarboxylic acid
EINECS	240-163-4

Quality Control

Our 4-[(5-Chloro-4-Methyl-2-Sulphophenyl)Azo]-3-Hydroxy-2-Naphthoic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC and spectroscopic methods, to ensure high purity and consistent performance. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are available upon request to support your quality assurance protocols.

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). Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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