Photoinitiator TPO/Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide/CAS No.: 75980-60-8

Photoinitiator TPO
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Product Identification

  • Product Name: Photoinitiator TPO

  • Chemical Name: Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide

  • CAS No.:75980-60-8

  • Molecular Formula:C₂₂H₂₁O₂P

  • Molecular Weight: 348.37 g/mol

2. Product Description

Photoinitiator TPO is a highly efficient Type I free-radical photoinitiator with excellent absorption in the near-UV to visible light range. It is widely used in UV-curable systems requiring deep curing, low yellowing, and fast curing speed.

3. Typical Physical & Chemical Properties

ItemSpecification
AppearanceYellow powder
Assay (Purity)≥ 99%
Density1.17 g/cm³
Volatile Content≤ 0.5%
Flash Point268.1 °C
SolubilitySoluble in common acrylate monomers and organic solvents
OdorSlight

Note: Typical values are not intended for use as specifications.

4. UV Absorption Characteristics

  • Absorption Range: 350–420 nm

  • Peak Absorption: ~380 nm

  • Suitable for UV-LED and mercury lamp curing systems

5. Application Areas

  • UV-curable coatings

  • UV inks and varnishes

  • UV adhesives

  • 3D printing resins

  • Electronic and optical coatings