TPO (Diphenyl(2,4,6-trimethylbenzoyl)phosphine Oxide) Photoinitiator
CAS Number: 75980-60-8
TPO is a highly efficient Type I radical photoinitiator with strong absorption in the near-UV and visible range (up to 420 nm), enabling effective cure through pigmented, thick, or filled adhesive formulations. Its longer wavelength absorption compared to benzophenone-type initiators gives better through-cure in pigmented and white adhesive systems. TPO is widely used in UV adhesives, dental composites, UV inks, and coatings where good depth of cure is critical.
Technical Specifications
| purity | ≥98% |
| moisture | ≤0.5% |
| appearance | Yellow powder or granules |
| meltingPoint | 91–95 °C |
| absorptionMax | 295 nm, 370 nm |
Applications
- UV adhesives for opaque and pigmented substrates
- Dental composite photopolymerization
- UV printing inks (flexo, screen, offset)
- White and filled UV coating systems
- Optical fiber UV-curable coatings
Key Features
- Long-wavelength absorption for deep and surface cure
- Effective in pigmented and filled systems
- High efficiency at low concentrations
- Good compatibility with acrylate and epoxy systems
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CAS Number
75980-60-8
Category
Adhesive / Sealant AdditivesAvailability
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