Simbi isina simba ine kugona kuramba mwemhepo outmoke oxidation, ndiko kuti, kune kugona kuramba corros mumienzaniso ine acid, Alkali, ndiko kuti, ndiko kupokana. Nekudaro, huwandu hwekupokana kwekushora hunosiyana nemhando yemakemikari yeiyo simbi pachayo, mamiriro eumwe neumwe, mamiriro ekushandiswa, uye rudzi rwepamhepo yepakati.