Description

Ethyl (2,4,6-Trimethylbenzoyl) Phenylphosphinate is a highly efficient and widely used Type I photoinitiator for free radical polymerization. This compound is valued for its exceptional reactivity under UV light, enabling rapid curing and high throughput in industrial processes. It is a critical component for manufacturers in the coatings, inks, and adhesives sectors seeking fast, low-energy, and high-performance UV-curable formulations.

Application

• UV-Curable Coatings: A key photoinitiator for clear coats, wood finishes, and industrial metal coatings requiring fast surface cure and excellent yellowing resistance.
• Graphic Arts & Printing Inks: Enables rapid curing in offset, flexographic, and screen printing inks for high-speed production on paper, plastic, and metal substrates.
• Adhesives & Sealants: Used in UV-curable adhesives for electronics assembly, optical bonding, and medical device manufacturing.
• Electronics: Critical for photoresists and solder masks in printed circuit board (PCB) fabrication, providing precise patterning.
• 3D Printing/Additive Manufacturing: Facilitates the photopolymerization process in vat polymerization (e.g., SLA, DLP) technologies for high-resolution parts.
• Dental Composites: Employed in light-curable restorative materials and dental adhesives for quick setting and durability.

Basic Information

Product Name	Ethyl (2,4,6-Trimethylbenzoyl) Phenylphosphinate
CAS No.	84434-11-7
Molecular Formula	C24H25O3P
Molecular Weight	392.43 g/mol
Synonyms	Ethyl (2,4,6-Trimethylbenzoyl)phenylphosphinate; Phenylphosphinic Acid Ethyl Ester (2,4,6-Trimethylbenzoyl) Ester; TPO-L; Lucirin TPO-L; 2,4,6-Trimethylbenzoylphenylphosphinic Acid Ethyl Ester; Ethyl (Mesityloyl)phenylphosphinate; Ethyl 2,4,6-Trimethylbenzoylphenylphosphinate; Photoinitiator TPO-L
EINECS	Contact for details

Quality Control

Our Ethyl (2,4,6-Trimethylbenzoyl) Phenylphosphinate is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistent performance and compliance with customer specifications. Certificates of Analysis (COA) detailing all relevant parameters are provided with each shipment.

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 and incompatible materials. Due to its light-sensitive nature, containers should be kept sealed until ready for use in a controlled environment.

Specification

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

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