Ukusebenzisa izinto ezigqwesileyo ze-PE, umbala oqaqambileyo.Isetyenziswa ngokubanzi kwisilumkiso sendawo kunye nokwahlukaniswa kweemeko ezingxamisekileyo okanye iindawo zokwakha kunye neendawo ezinobungozi.
Iteyiphu yesithintelo Isilumkiso ikwabizwa ngokuba yiteyiphu yokuzazisa, iteyiphu yomhlaba, iteyiphu yomgangatho, iteyiphu ephawulekayo, njl.