Description

Diphenyl(2,4,6-Trimethylbenzoyl)Phosphine Oxide is a highly efficient, commercially significant photoinitiator widely used in UV-curable systems. Its core value lies in its exceptional reactivity and low yellowing properties, which are critical for producing high-quality, durable finishes. This compound is essential for formulators and manufacturers in the coatings, inks, adhesives, and advanced materials sectors seeking superior curing performance.

Application

• Primary photoinitiator in UV-curable coatings for wood, plastic, and metal substrates.
• Key component in UV printing inks and overprint varnishes requiring fast cure and high gloss.
• Used in UV-curable adhesives and sealants for electronics and optical assemblies.
• Essential for the production of photopolymers and dental restorative materials.
• Facilitates rapid curing in 3D printing (stereolithography) resins.
• Employed in the manufacture of optical fiber coatings and electronic conformal coatings.

Basic Information

Product Name	Diphenyl(2,4,6-Trimethylbenzoyl)Phosphine Oxide
CAS No.	75980-60-8
Molecular Formula	C22H21O2P
Molecular Weight	348.38 g/mol
Synonyms	TPO; 2,4,6-Trimethylbenzoyldiphenylphosphine oxide; Phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (common misnomer); Lucirin TPO; Irgacure TPO; Ethyl (2,4,6-trimethylbenzoyl) phenyl phosphinate (related compound); Benzene, 1,1'-(phosphinylidene)bis[2,4,6-trimethyl-, 1-oxide; Photoinitiator TPO
EINECS	Contact for details

Quality Control

Our Diphenyl(2,4,6-Trimethylbenzoyl)Phosphine Oxide is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets the high standards required for industrial and specialty chemical applications. Certificates of Analysis (COA) detailing purity, melting point, and spectral data are available upon request.

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 material is hygroscopic (moisture-sensitive); keep the container tightly sealed to minimize exposure to atmospheric humidity.

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 %

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