Proma fr4 epoxy resin boards positive cu 35 m 100 250mm l proma 100100 0160 the proma fr4 epoxy resin board positive cu 35 m single sided 15 x 100 x 160mm has been manufactured with a photo coated base material positive and boasts a 15mm thickness this value board is ideal for constructing fixings chassis facings etc and can be easily worked using normal tools proma 100100 0160 fr4 epoxy resin board positive cu 35 m 1 sided 15x100x160mm