faeba khalase hlahetse 1930s le. Ho e mosa ea inorganic bao e seng metallic lintho tse bonahalang tse hlahisoang ke pyrophyllite, quartz lehlabathe, a lejoe la mokoetla, dolomite, calcite, brucite, acid e boric, soda le molora le thepa e 'ngoe lik'hemik'hale tala. E na boima ba 'mele leseli, matla a phahameng, e phahameng le e tlase mocheso ho hanyetsa, corrosio ...
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