Photoinitiator 819 (Phenylbis(2,4,6-trimethylbenzoyl)phosphine Oxide, BAPO)
CAS Number: 162881-26-7
Photoinitiator 819 (BAPO) is a bisacylphosphine oxide Type I photoinitiator with exceptionally wide absorption extending to 470 nm, providing outstanding deep cure and through-cure in thick, pigmented, and white UV adhesive and coating systems. Each molecule generates two radical pairs upon UV excitation, resulting in very high efficiency and low required concentration. It is the preferred photoinitiator for white and opaque UV adhesives, dental materials, and light-curable encapsulants.
Technical Specifications
| purity | ≥98% |
| moisture | ≤0.3% |
| appearance | Yellow to greenish-yellow powder |
| meltingPoint | 127–133 °C |
| absorptionMax | 295 nm, 370 nm, 400 nm |
Applications
- White and opaque UV adhesives
- Thick-section UV potting compounds
- Dental materials and orthodontic adhesives
- UV-curable encapsulants for LEDs
- UV-curable composites with high filler loading
Key Features
- Widest absorption range—cure with visible light up to 470 nm
- Bisacylphosphine generates 2 radical pairs per molecule
- Outstanding deep cure in thick and pigmented systems
- Low required concentration due to high efficiency
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CAS Number
162881-26-7
Category
Adhesive / Sealant AdditivesAvailability
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