Description

3-[[4-[(4-Hydroxyphenyl)Azo]-3-Methylphenyl]Azo]Benzenesulfonic 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 dyes and pigments with excellent light and wash fastness properties. It is primarily required by manufacturers in the textile, ink, and specialty chemical industries seeking reliable intermediates for high-performance color applications.

Application

• Primary intermediate for the synthesis of azo dyes and pigments used in textile coloring.
• Key component in manufacturing industrial inks for packaging and printing applications.
• Used in the production of specialty colorants for plastics and polymers.
• Intermediate for research and development of novel photochromic or functional dyes.
• Potential use in the formulation of biological stains and histological dyes for laboratory use.
• Raw material for paper coloration and coating applications.

Basic Information

Product Name	3-[[4-[(4-Hydroxyphenyl)Azo]-3-Methylphenyl]Azo]Benzenesulfonic Acid
CAS No.	63216-99-9
Molecular Formula	C19H16N4O4S
Molecular Weight	396.42 g/mol
Synonyms	Benzenesulfonic acid, 3-[[4-[(4-hydroxyphenyl)azo]-3-methylphenyl]azo]-; 3,3'-((4-Hydroxy-3-methylphenyl)diazenyl)diazene-1,4-diyl)dibenzenesulfonic acid (related); Azo dye intermediate 63216-99-9; 3-[(4-[(4-Hydroxyphenyl)azo]-3-methylphenyl)azo]benzenesulphonic acid; CI 26050 (Potential associated color index); Disperse Orange dye intermediate; Hydroxy azo benzene sulfonic acid derivative
EINECS	Contact for details

Quality Control

Our 3-[[4-[(4-Hydroxyphenyl)Azo]-3-Methylphenyl]Azo]Benzenesulfonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for use as a dye intermediate. Certificates of Analysis (COA) documenting batch-specific results 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 after opening to prevent moisture absorption, which can affect product performance.

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.