Ukumelana nezinga lokushisa eliphezulu: Eminye imikhiqizo ipakishwa ezingeni lokushisa eliphezulu, noma idinga ukuvalwa kwezinga lokushisa okuphezulu ngemva kokupakishwa. Ngalesi sikhathi, ifilimu yokuvala uphawu kanye nenkampani yenethiwekhi iyadingeka ukuthi ibe nezici zokumelana nokushisa okuphezulu, futhi izinga lokushisa eliphakeme lingu-<135℃.