Curing UV Cationic (Epoxy) Adhesives
UV-cure epoxies cure by a cationic mechanism that is not quenched by oxygen, so they finish tack-free in open air. Low shrinkage and good chemical resistance make them a choice for optics, electronics encapsulation, and demanding bonds.
How It Cures
Cationic cure continues (dark cures) after the light is removed and is not oxygen-inhibited, giving a hard, tack-free surface. It typically wants the shorter UV bands to initiate, and is sensitive to humidity and some contaminants.
Through a substrate: Initiates best with shorter UV (around 365 nm), so a substrate that blocks short UV works against it, cure in open air or through a UV-transparent path.
The SunSpot 2’s broad spectrum reliably includes the shorter bands cationic systems want, and its intensity drives the initiation; for a fixtured 365 nm line a matched SkyBeam channel also works.
Get a quote, no quote wallAlways confirm the exact cure wavelength and dose on your adhesive’s own datasheet, this page describes how the chemistry class behaves, not a specific product.
