Taking the Bubbles Out of Electric Component Potting

Posted on 9/10/2020 11:31:57 AM By ASC

With air bubbles one of the biggest threats to the effective potting and performance when used to protect electric components from environmental conditions such as vibration, moisture and humidity, ViscoTec Asia’s laboratory has pursued the most obvious direction in seeking a solution - excluding air during the potting process. To do so, it has tested the advantages of carrying out the potting process in a vacuum when potting compounds such as epoxy, silicone or polyurethane liquid resins, particularly when it involves the small and complex assemblies needed in electronics.

While the company acknowledges the complexity and demands involved in using a vacuum chamber and the necessary equipment do not necessarily make it suitable for every situation, it reports it has proved successful in certain cases.

After a case study testing the results of potting small 2.8mm holes in under 10 seconds with and without a vacuum in its new laboratories, the company reports that using a vacuum chamber resulted in meeting the 10 second time challenge and no cavities, while doing so without a vacuum took two to three times longer, and cavities were found in the cured material.