Hello, can someone help me with the following: We are using boards with base material FR4 (epoxy), Polimide and Duroid 6002 and 6010. In our specification to the PCB manufacturer, the manufacturer shall do a peel strength test with the following criteria (test performed on a Test Coupon). Below values are for a conductor with a width of 1mm (for 0.2mm conductors the value is 20% of values listed below) Epoxy = 1.6N Polimide = 1.2N Duroid = 0.8N My question is, if someone know the min. conductor width which shall be designed on boards with the different materials (due to the different peel values) and still with a good adesive pattern/base material. Duroid boards should have wider conductors compared to Epoxy board, due to the different in peel values, to receive the same peel value? What is the minimum peel value conductor/base material on a board which shall be working without any problems? Best Regards Peter Dahlén Saab Ericsson Space