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Adhesives require a chemical reaction to convert their structure from the liquid to the solid state. Once cured, the adhesive provides a high-strength bond between two substrates, which resists temperature or humidity changes and is impervious to many chemicals.

There are several ways to achieve the reactive curing process, such as light, heat, moisture or the combining of two reactive components. A UV-curing adhesive contains photo-initiators that start the chemical reaction when exposed to light of the appropriate wavelength and intensity, usually wavelengths of 250 nm to 400 nm. The UV-curing mechanism can be applied to several types of chemistries; there are UV-curing acrylics, epoxies, silicones and cyanoacrylates to name a few.

Strengths and weaknesses of UV-curing adhesives

Like any curing process, UV curing has its advantages and disadvantages.

The UV-curing process is flexible. Since it depends on the intensity of the UV light, the curing time can be controlled and can be as fast as a few seconds at high intensity or much longer at lower intensities  Click here to continue reading