Ezi fekthi zinokuchasana ngokugqwesileyo kwizisombululo ze-acidic ezifana ne-nitric acid, i-phospuric acid, phosphoric acid, njl njl. Iingcali zethu zivelisa isigaba senqanaba lesigaba se-F60 flenges ezinepropathi ebalaseleyo efana nepropathi eyomeleleyo, amandla aphezulu, amandla aphezulu, ukuqina, ukuphumelela komgangatho ophezulu.