a) I-Aerospace, i-architectural, izimoto, amakhemikhali, izinsimbi, i-electronic, ukuphatha ukudla, izingxenye zesithando somlilo & izinto ezilungiswayo, ihadiwe, ubucwebe, indawo enezinga lokushisa eliphansi, indawo yamanzi olwandle nolwandle, okokusebenza kwehhovisi, imithi, ukushisela, kanye nokwakhiwa kwe-pulp & nephepha.

b) Izimpushana zensimbi engagqwali ngokukhethekile zinikeza ukumelana nokugqwala, ukuphela kwendawo, ukumelana nokugqokwa, ukukwazi ukusebenza kahle, ukumelana ne-oxidation, aqeda ukucwebezela, amandla okushisa aphakeme, kanye ne-coefficient ephansi yokunweba.

c) Izingxenye ezibunjiwe ngomjovo wensimbi.