1. Isikhumba semvelo sifanelekile ukukhiqizwa kwezimboni ezinkulu, futhi singenziwa ngokwezifiso ngamandla ahlukahlukene, umbala, ukukhanya, iphethini, iphethini kanye neminye imikhiqizo ngokuvumelana nezidingo zamakhasimende, ngekhwalithi yomkhiqizo ozinzile futhi engaguquki.
2. Izindleko eziphansi zokukhiqiza kanye nentengo ezinzile. Izinsiza zempahla eluhlaza ezidingekayo ekukhiqizeni isikhumba sokwenziwa ziningi futhi zizinzile, ezingahlangabezana nesidingo semakethe.
3. Ngenxa yezimpawu zemiphetho ehlanzekile kanye nezakhiwo ezibonakalayo ezifanayo zesikhumba semvelo, ukusebenza kahle kokusika kuphezulu futhi izinga lokusebenzisa ukusika liphezulu. Ummese owodwa wesikhumba sokwenziwa ungasika izingqimba eziningi, futhi ulungele umshini wokusika othomathikhi; Isikhumba semvelo singanqunywa kuphela ungqimba olulodwa, futhi ukukhubazeka kwesikhumba semvelo kudinga ukugwema lapho ukusika. Ngesikhathi esifanayo, imimese idinga ukuhlelwa ngokwezinto zesikhumba ezingavamile, ngakho-ke ukusebenza kahle kokusika kuphansi.
4. Isisindo sesikhumba sokwenziwa silula kunesesikhumba semvelo, futhi azikho iziphambeko zokuzalwa zesikhumba semvelo njengenundu elidliwe kanye nesikhunta.
5. Ukumelana okuhle kwe-asidi, ukumelana ne-alkali nokumelana namanzi, ngaphandle kokufiphala nokushintsha umbala.