Description

(2,4,6-Trimethylbenzoyl)Bis(o-Tolyl)Phosphine Oxide is a highly efficient photoinitiator belonging to the acylphosphine oxide (APO) family. Its primary value lies in its ability to generate free radicals upon exposure to UV light, initiating rapid and deep-through polymerization in various resin systems. This compound is essential for manufacturers in the coatings, inks, and adhesives industries seeking high-performance, low-yellowing, and fast-curing formulations.

Application

• UV-Curable Coatings: A key component in wood, plastic, and metal coatings requiring excellent surface cure and minimal yellowing.
• Graphic Arts & Printing Inks: Used in UV-curable inks for packaging, labels, and commercial printing to ensure fast drying and high gloss.
• Industrial Adhesives & Sealants: Facilitates rapid curing in UV-activated adhesives for electronics, medical devices, and optical bonding.
• Dental Composites & Restoratives: Serves as a photoinitiator in light-cured dental materials for precise and fast hardening.
• 3D Printing (Stereolithography - SLA): Enables layer-by-layer curing in high-resolution 3D printing resins for prototyping and manufacturing.
• Optical Fiber Coatings: Provides efficient curing for protective coatings on optical fibers, ensuring durability and performance.
• Electronic Encapsulants & Potting Compounds: Used in UV-curable resins for protecting sensitive electronic components.

Basic Information

Product Name	(2,4,6-Trimethylbenzoyl)Bis(o-Tolyl)Phosphine Oxide
CAS No.	84455-37-8
Molecular Formula	C30H29O2P
Molecular Weight	452.52 g/mol
Synonyms	Bis(2-methylphenyl)(2,4,6-trimethylbenzoyl)phosphine oxide; 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide, bis(o-tolyl) derivative; TPO (o-tolyl); Omnirad TPO-L; Irgacure TPO-L; Ethyl (2,4,6-trimethylbenzoyl) phenyl phosphinate (related); APO-type photoinitiator; Light-sensitive phosphine oxide initiator
EINECS	Contact for details

Quality Control

Our production of (2,4,6-Trimethylbenzoyl)Bis(o-Tolyl)Phosphine Oxide adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against rigorous internal specifications using advanced techniques like HPLC and NMR. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and key physical parameters is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, handling should be conducted under subdued light or yellow light conditions to prevent premature decomposition.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	88 - 92 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
UV Absorption	Conforms

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