Proma cobritherm boards cu 35 m single sided proma 108025 002515 the proma h3515 cobrithermreg board cu 35 microm single sided 15 x 25 x 25mm is a laminate comprising of an aluminium carrier plate with a coating of polymer ceramic compound above this is a layer of coppercobrithermreg is used mainly at all the places where the arising power loss heat must be dissipated as soon as possible typical application areas are the assemblies of performance electronics such as the power led