Ukuthengiswa ngokuthe ngqo kwefektri, iinkcukacha ezipheleleyo zokukhukula kunye nelaphu lokuthintela ingca, uyilo oluncinci kunye olufanelekileyo luvumela ilaphu ukuba ligcine ixesha kunye nomgudu, uthintelo lwengca oluchanekileyo.
1, akukho lula ukuguga, ukomelela okuphezulu kunye nokuqina, ukunxiba kunye nokukrazula ukumelana, uyilo lobuchwephesha yonke i-intshi yelaphu yomelele.
2, ukuluka ngokuchanekileyo, ukufunxa okusebenzayo kokukhanya kwe-ultraviolet, kuthintela ukukhula kokhula
I-3, uyilo lwezenzululwazi, ukuphefumla kunye nokungena kwamanzi, ukunyanzeliswa okunamandla