Irgacure 907

Radical Initiation

Absorption of ultraviolet light causes the molecule to break apart and release reactive species that start the polymerisation of the ink. Because irgacure 907 is highly efficient, it allows for high speed printing on plastic films and containers. The rapid cure prevents the ink from smearing during high volume production.

This chemical is particularly effective in pigmented systems where light penetration is limited.

Extraction Risk

Small molecular size makes this compound prone to migrating through the packaging and into the food product. If the ink is not fully cured, the unreacted photoinitiator remains mobile within the dried film. Migration studies often identify this specific substance when testing printed polyolefin layers.

The presence of this compound in food simulants can lead to regulatory rejection of the packaging batch.

Sourcing Alternative

Regulations in certain regions have restricted the use of this chemical in food contact materials due to health concerns. Moulders and printers now select larger molecular weight initiators or polymeric versions that cannot migrate. This shift ensures that the final packaging meets the latest safety requirements.