Amacala aphambili nangasemva kwesekethe ye-PCB anemigca yobhedu. Kwisekethe i-PCB, nokuba ingaba i-Copper yamanzi ikhethiwe kumgangatho weendleko oguquguqukayo okanye ukudibanisa kabini kunye nokuthabatha, iziphumo zokugqibela yindawo egudileyo nengenalondolozwa. Nangona iipropathi zomzimba ze-copper aziyichwayiti njenge-aluminium, i-iron, i-magnesium, njl njl, phantsi kwendawo yomkhenkce, ioksi ye-oxyper kunye ne-oxygen ichaphazeleka kakhulu kwi-oxidation; Ukujonga ubukho be-CO2 kunye nomphunga wamanzi emoyeni, umphezulu wayo yonke i-copper emva kokunxibelelana negesi, impendulo ye-reox iya kwenzeka ngokukhawuleza. Ukujonga ukuba ubukhulu bobhedu kwisekethe ye-PCB butyeshekile, ubhedu emva kokuba umoya oqinileyo uya kuba yimeko ye-quasi yombane, eya kwenzakalisa izixhobo zombane, eziya kuthi zonakalise kakhulu iimpawu zesekethe zombane.

Ukwenzela ukuthintela i-oxidation yobhedu, kwaye ngcono ukwahlula iinxalenye ze-welding kunye nezingasebenziyo ze-welding zesekethe ngexesha le-welble, kwaye ukulungiselela ukugcinwa kombane, kunye neenjineli ze-PCB zenze i-PAASTASS. Iingubo ezikhoyo zoyilo zinokudityaniswa ngokulula kumphezulu wesekethe ye-PCB, okukhokelela kubungqingqwa bomemo okhuselayo ekufuneka ube mncinci kwaye uvingce umfowunelwa wobhedu kunye negesi. Lo mbekelelo ubizwa ngokuba yi-Copper, kunye neZixhobo eziPhambili ezisetyenzisiweyo yimaski yomthengi