Description

4,4'-Azobis[3-Phenylisoxazol-5(4H)-One] is a specialized, high-performance azo-type initiator used in free-radical polymerization processes. This compound is valued for its ability to generate radicals at moderate temperatures, offering precise control over polymer chain initiation and growth. It is essential for manufacturers in the polymer, specialty chemical, and advanced materials sectors seeking to produce high-quality resins, coatings, and functional polymers with specific molecular architectures.

Application

• Primary initiator for free-radical polymerization of vinyl monomers such as styrene, acrylates, and methacrylates.
• Production of engineering plastics and high-performance resins requiring controlled molecular weight distribution.
• Synthesis of acrylic polymers for coatings, adhesives, and sealants.
• Manufacture of cross-linked polymer networks and specialty elastomers.
• Research and development of advanced polymeric materials in academic and industrial laboratories.
• Component in formulations for photoresists and other electronic materials.

Basic Information

Product Name	4,4'-Azobis[3-Phenylisoxazol-5(4H)-One]
CAS No.	56666-60-5
Molecular Formula	C30H20N4O4
Molecular Weight	500.51 g/mol
Synonyms	4,4'-Azobis(3-phenyl-5-isoxazolone); 4,4'-Azobis(3-phenyl-4,5-dihydro-5-isoxazolone); 3-Phenyl-4,5-dihydro-5-isoxazolone azobis dimer; Azo-bis-isoxazolone; ABPO; Polymerization initiator V-30; 4,4'-(Diazen-1,2-diyl)bis(3-phenyl-4,5-dihydro-1,2-oxazol-5-one)
EINECS	Contact for details

Quality Control

Our 4,4'-Azobis[3-Phenylisoxazol-5(4H)-One] is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure high purity and consistent performance as a polymerization initiator. Certificates of Analysis (COA) detailing purity, assay, 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, well-ventilated place at room temperature (15-25°C). This product is light-sensitive (store away from light) and easily oxidized (store under inert atmosphere). Keep away from heat, sparks, and open flame. Isolate from incompatible materials such as strong reducing agents.

Specification

Item	Specification
Appearance	Yellow to orange crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Melting Point	140 - 145 °C (dec.)
Loss on Drying	≤ 0.5 %
Residue on Ignition	≤ 0.1 %

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