UV-Curable Epoxies for Dam and Fill Applications

摘要

Dam and fill is a selective process that protects specific areas of a PCB with an optically transparent encapsulant using two different materials.Encapsulants of this kind usually have a low viscosity.A dam is therefore applied around the component first to prevent the potting material from flowing across the substrate.Epo-Tek OG116-31,a product manufactured by Kummer,is a UV-curable epoxy.Because of its thixotropic nature it is often used as a dam material.It can be cured with UV light in a very short time.The encapsulant,which is either a UV-curable or a thermoset material,is applied afterwards.