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INTRODUCTION
UV technology involves curing a liquid resin within seconds after application of UV light.
The rapid cure response of these conformal coatings offers many advantages over the
conventional coatings as illustrated in Table 1.
UV cure is a cool process. There are no run away exotherms that are often found in
conventional systems. A rapid cure and a cool process eliminates the egression of gases from
within, or on the surface of, electronic components. There are no pin holes or blow holes
associated with UV curable barrier coatings. After the rapid cure, the coating is devoid of any
flaws resulting from the outward escape of gases. Devoid of flaws, the coating is resistant to
inward fluxes of solvents, ions, polar molecules and water vapor.
This revolutionary technology is designed to use specific polymers that retain their physical
properties after thousands of hours of thermal testing. Each polymer selected is compatible with
the numerous electronic component materials available. Selection of the polymers is critical
because the polymers need to adhere to the electronic materials without interfering with the
material's inherent electrical properties.
And, the polymers and monomers selected must be able to withstand the high humidities
concomitant with high temperatures. These are some of the major requirements that must be met
by a conformal barrier coating that will be applied onto electronic components.
The most severe test for an electronic component to withstand is exposure to high
humidities concomitant with high temperatures.
