1. Uyilo oluphindwe kabini lunokuthintela ngokufanelekileyo isitya sephepha ukuba singavuzi kwaye sigcine ingqibelelo yokutya.
2. Uluhlu lwangaphandle lwefilimu ye-PE ayinamanzi kunye ne-oyile-ubungqina, kwaye i-inner layer yefilimu ye-PE ikhusela ukuguqulwa komzimba wendebe yephepha kunye nokwandisa ukuqina.
3. Uyilo olulula nolukhawulezayo olulahlwayo;kulula ukucoca nokuphatha;alungele amaxesha ahlukeneyo, njengokuthatha kunye namatheko.