Cov khoom no muaj zog tev tawm, lub zog tensile, roj tsis kam, dej tsis kam, thiab corrosion kuj.Nws yog tuab dua, yooj yim dua los tsim kua muag, thiab nplaum dua li OPP daim kab xev, thiab tuab dua li cov ntawv luam tawm daim kab xev, nrog cov tawv zoo dua thiab cov qauv zoo dua.