Description

2,5-Dichloro-4-[[4-(Phenylamino)Phenyl]Azo]Benzenesulfonic Acid is a specialized azo dye intermediate characterized by its sulfonic acid and dichloro-substituted aromatic structure. This compound matters for its role as a key precursor in synthesizing high-performance dyes and pigments, offering excellent color fastness and thermal stability. Industries that require it include textile manufacturing, ink production, and the development of functional colorants for plastics and coatings.

Application

• Primary intermediate for the synthesis of azo disperse dyes and acid dyes used in textile coloring.
• Key precursor in manufacturing high-performance pigments for plastics, inks, and coatings.
• Used in research and development of functional dyes for non-textile applications, such as in electronics or imaging.
• Potential intermediate for liquid crystal dyes and other advanced materials requiring specific chromophores.
• Employed in the production of colorants for specialty papers and security printing inks.

Basic Information

Product Name	2,5-Dichloro-4-[[4-(Phenylamino)Phenyl]Azo]Benzenesulfonic Acid
CAS No.	99776-84-8
Molecular Formula	C18H12Cl2N4O3S
Molecular Weight	435.28 g/mol
Synonyms	2,5-Dichloro-4-[(4-anilinophenyl)azo]benzenesulfonic acid; Benzenesulfonic acid, 2,5-dichloro-4-[[4-(phenylamino)phenyl]azo]-; C.I. Acid Orange 156; Acid Orange 156; Azo dye intermediate OA-156; 4-[(4-Anilinophenyl)azo]-2,5-dichlorobenzenesulfonic acid; 99776-84-8
EINECS	Contact for details

Quality Control

Our 2,5-Dichloro-4-[[4-(Phenylamino)Phenyl]Azo]Benzenesulfonic Acid undergoes rigorous quality testing to ensure compliance with industry standards for dye intermediates. 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

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

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