Ibhodi yokuxhoma yangaphandle kunye nangaphakathi luhlobo lwezinto zokwakha, ezisetyenziselwa udonga lwangaphandle okanye udonga lwangaphakathi.Ibhodi yokuxhoma yangaphandle nangaphakathi kufuneka ibe ne-anti-corrosion, ukumelana nobushushu obuphezulu, ukuguga, akukho mitha, ukuthintela umlilo, ukulawula izinambuzane, akukho deformation kunye nezinye iimpawu ezisisiseko.Ngelo xesha, zifuna ukubonakala okuhle, ukwakhiwa okulula, ukukhuselwa kwendalo kunye nokugcinwa kwamandla.