How do I calculate dielectric strenght of a material (i.e. V/mm until it br= eaks down in a spark) given the dielectric constant and/or other required properties = (and which)? For example, for air (without humidity there to false the results, of cours= e) I know it is 1MV/m (1KV/mm), and ten times as much for epoxy.. but how is it calculat= ed? Thanks, Mario --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .