Photoinitiator 819/Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide/CAS No.: 162881-26-7

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1. Product Identification

  • Product Name: Photoinitiator 819

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

  • CAS No.: 162881-26-7

  • Molecular Formula: C₂₆H₂₇O₃P

  • Molecular Weight: 418.5 g/mol

2. Product Description

Photoinitiator 819 is a highly efficient Type I phosphine oxide photoinitiator with excellent absorption in the near-UV and visible light range. It provides fast curing speed, deep curing capability, and low yellowing, making it especially suitable for thick films and pigmented systems.

3. Typical Properties

ItemSpecification
AppearancePale yellow powder
Assay≥ 99%
Density1.20 g/cm³
Volatile Content≤ 0.5%
Flash Point310.6 °C
SolubilitySoluble in common acrylate monomers and organic solvents

Note: The above data are typical values and not intended for use as specifications.

4. Performance Characteristics

  • High photoinitiation efficiency

  • Excellent curing depth

  • Low odor and low yellowing

  • Good thermal stability

  • Suitable for LED and UV curing systems

5. Applications

  • UV-curable inks

  • UV coatings and varnishes

  • Pigmented and filled systems

  • Thick film curing applications

  • UV-curable adhesives