continuous lamination processes or for longer times at lower temperatures such as in low energy press processes 5 optionally the resulting laminate for example a copper clad laminate may be post treated by heating for a time at high temperature and ambient pressure the temperature of post treatment is usually between 120 u00b0 c and 250 u00b0 c the post treatment time usually is between 30 minutes and 12 hours the ipc test methods are the electrical laminate industry standard the institute for interconnection and packaging electronic circuits 3451 church street evanston ill 60203 as follows a flask equipped with a stirrer a reflux condenser thermometer and solids addition funnel is charged with 462 g of bisphenol a epoxy resin epoxy value 5 55 eq kg mw 340 after reaching 100 u00b0 c inner temperature of the flask 60 g of bisphenol s is added that reaction mixture is dissolved under stirring for 40 minutes until a temperature of 155 u00b0 c to 160 u00b0 c is reached after that time 78 g of bisphenol s is added at 155 u00b0 c to 160 u00b0 c the reaction mixture is maintained under stirring until after 4 hours an epoxy value of 1 94 eq kg 2 43 theoretical epoxy value is reached the reaction mixture is cooled and subsequent blended with methylethylketone to a solid content of 70 the resin showed a viscosity at 25 u00b0 c of 2358 mpas and an epoxy value of 1 92 eq kg benzoxazine fiberglass laminate composites are made by the solvent impregnating process the laminate according to the instant invention bold meets the v0 criterion whereas an epoxynovolac resin laminate replacing.