Chemical Additives

​Photoinitiator 819 (Phenylbis(2,4,6-trimethylbenzoyl)phosphine Oxide)

CAS No.: 162881-26-7
Appearance: Yellow powder.

​Specifications

• ​Purity: ≥99.0%
• ​Molecular Formula: C₂₆H₂₇O₃P
• ​Molecular Weight: 418.46 g/mol
• ​EINECS No.: 423-340-5
• ​Melting Point: 131–135 °C (lit.)
• ​Boiling Point: 590.0 ± 60.0 °C
• ​Density: 1.17 ± 0.1 g/cm³

​Applications

• ​UV-Curable Systems:
  • ​UV varnishes, ​lacquers, and ​printing inks for substrates like ​wood, ​paper, ​metal, ​plastics, and ​fiber optics.
  • Used in ​prepreg systems for composite materials.

​Packaging & Transportation

• ​Standard Packaging: 25 kg/drum.
• ​Custom Packaging: Available per buyer’s requirement.

​Storage

• Store in a ​cool, ventilated place.
• Protect from ​sunlight, ​heat, and ​moisture.

Summary:
Photoinitiator 819 is a ​high-performance photoinitiator for UV-curable coatings and composites. Its ​broad reactivity and ​thermal stability enable efficient curing across diverse industrial applications, while strict ​storage protocols ensure long-term stability.