Da yawa kyawawan kaddarorin da aka samu a cikin samfurin guda kawai saboda mafi kyawun takardar samar. Waɗannan ƙarfi masu tsayayyen tsawan ƙasa, daidaito mai kyau, sassauƙa, sassauƙa da karko, suna tsayayya da kaya, ƙarfi gini. Bishara ga lalata, damuwa danniya crosing, crevice lalata lalata, oxidation oxroidation \ / clating lalata jiki yasa ya dace da ɗakunan aikace-aikace.