A method to quantify the surface insulation resistance performance of glob tops exposed to different temperature/humidity combinations

Abstract

Often the only information that suppliers of glob top encapsulant and dam and fill materials provide for users of their materials is a single value of surface insulation resistance. This datum provides very little information about the encapsulant performance over the wide range of different humidity/temperature conditions that it may encounter in its service life. This procedure describes a simple method for characterising the performance of encapsulant materials over a broad range of environmental conditions. The resultant data can be used to assess the performance of different manufacturers' formulations or types of encapsulant dispensed on to different board finishes or on to different board materials.