Izikhwama zepulasitiki ezibonisa izinto zokuvikela ukudla, Zifanele ukupakishwa kwe-vacuum yazo zonke izinhlobo zokudla, ingcindezi ephansi ye-oxygen negative, ubusha obuhlala isikhathi eside Izinto zebanga lokudla, zingasetshenziswa ngokuzethemba Minus 20 ℃-180 ℃, akukho ukuphulwa kwesikhwama.