What is a cationic or dual cure Optimax® UV adhesive?

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Optimax® cationic/dual cure adhesives such as 6439 and 6440 cure under UV light and also via a secondary mechanism (heat or activator), ensuring complete polymerisation in shadowed or opaque areas. Unlike free radical systems, cationic chemistries continue curing even after the UV source is removed, a phenomenon known as "dark cure". This is particularly valuable for thorough cure in micro-gap regions and beneath opaque substrates. Ideal for complex assemblies in medical, automotive, or electronics manufacturing.