Birta loo yaqaan 'gelvanized bir' bir ah bir ah ama bir lagu dahaadey lakab ilaalin ah oo ah zinc, zinc sida 30-275, hanaan loo yaqaan 'Galvanizon', si looga hortago daxanka. Dayntan waxaa lagu dabaqayaa iyadoo la adeegsanayo habka "kuleylka-kulul", halkaas oo ay birtu ku dubto qubayska zinc-ka la shubay, oo ah geedi socod ay ku sugan tahay birta salka ku haya, oo ah mid nololeed dheer oo ku yaal deegaanno badan. Waxay u dhaqmayaan ficilka dahaarka zinc ee caqabad. Marka loo soo bandhigo walxaha wasaqda leh, zinc laftiisa oxidizes, abuurista zinc oxides iyo kaarboon-ka-dhiska ah ee sameeya lakabka difaaca deggan ee birta. Birta cusub ee loo yaqaan 'solvanan' birta ku dhagan waxay leedahay dhammaystir dhalaalaya, dhalaalaya oo ku kala duwanaan kara midab iyo iftiin. Birta loo yaqaan 'Galvanized Birta' si fiican ayaa loo isticmaalay inta badan dhismaha.