Ngenxa yokuthi akukho ungqimba lwe-oxide ezindongeni zangaphakathi nangaphandle zepayipi elikhanyayo ngokunemba, akukho ukuvuza ngaphansi kwengcindezi ephezulu, ukunemba okuphezulu, ukuphela okuphezulu, akukho deformation ekugobeni okubandayo, ukuvutha, ukucaba futhi akukho mifantu, isetshenziswa ikakhulukazi ukukhiqiza imikhiqizo. wezingxenye zomoya noma ze-hydraulic, njengesilinda somoya noma isilinda sikawoyela, esingaba ipayipi elingenamthungo noma ipayipi elishiselwe.