Proma fr4 epoxy resin boards positive cu 35 m 100 250mm l proma 100250 0250 the proma fr4 epoxy resin board positive cu 35 m single sided 15 x 250 x 200mm 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 100250 0250 fr4 epoxy resin board positive cu 35 m 1 sided 15x250x250mm