Proma fr4 epoxy resin board cu 35 m 15 thickness proma 104075 0100 the proma fr4 epoxy resin board cu 35 m 15 x 70 x 100mm is a single sided board that is ideal for constructing fixings chassis facings etc the sheet can be easily worked using normal tools proma 104075 0100 fr4 epoxy resin board cu 35 m single sided 15 x 70 x 100mm