Mar as trice bidh bùird cuairte clò-bhuailte air an ceangal le còmhdach de foil copair air substrate glainne epoxy. Mar as trice is e tiugh foil copar 18 μ m, 35 μ m, 55 μ m agus 70 μ M. Is e an tighead foil copar as cumanta 35 μ M. Nuair a tha cuideam copair nas motha na 70UM, canar copar trom ris PCB