Description

p-[(4-Amino-2,5-Xylyl)Azo]Benzenesulphonic Acid CAS NO 53305-44-5 is an azo dye intermediate characterized by its sulfonic acid group, which imparts water solubility and is critical for the synthesis of acid dyes and pigments. This compound matters for its role in producing vibrant, colorfast dyes used in textiles, inks, and specialty coatings, offering manufacturers a reliable building block for complex colorants. Industries that need it include textile dye and pigment manufacturing, ink formulation, and research laboratories focused on advanced material science and synthetic chemistry.

Application

• Primary intermediate for the synthesis of acid dyes used in wool, silk, and nylon textile coloring.
• Key precursor in the manufacturing of pigments for inks, paints, and plastics.
• Used in research and development of new azo-based colorants with specific lightfastness and solubility properties.
• Potential intermediate for biological stains and histochemical dyes in laboratory settings.
• Employed in the synthesis of specialty dyes for leather and paper products.
• Starting material for functional dyes used in non-textile applications such as sensors or optical materials.

Basic Information

Product Name	p-[(4-Amino-2,5-Xylyl)Azo]Benzenesulphonic Acid
CAS No.	53305-44-5
Molecular Formula	C15H15N3O3S
Molecular Weight	317.36 g/mol
Synonyms	4-[(4-Amino-2,5-dimethylphenyl)azo]benzenesulfonic acid; Benzenesulfonic acid, 4-[(4-amino-2,5-dimethylphenyl)azo]-; p-[(4-Amino-2,5-dimethylphenyl)azo]benzenesulfonic acid; 2,5-Dimethyl-4-[(4-sulfophenyl)azo]aniline; Azo dye intermediate 53305-44-5; 4-Amino-2,5-xylyl azo benzenesulphonic acid; 4-[(4-Amino-2,5-dimethylphenyl)diazenyl]benzenesulfonic acid
EINECS	Contact for details

Quality Control

Our p-[(4-Amino-2,5-Xylyl)Azo]Benzenesulphonic Acid is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure high purity and consistency, with specifications verified by HPLC, IR spectroscopy, and titration methods. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are available upon request to support your quality assurance and regulatory compliance needs.

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 could affect product quality and handling properties.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder or crystals
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.