Ubukhulu becala kukho iindidi ezintlanu zeengcango zeglasi ezivutha umlilo, enye ineglasi edibeneyo engatshiyo, enye ineglasi engatshiyo, eyesithathu yiglasi ekhethekileyo engatshiyo, eyesine yiglasi engatshiyo engenanto, kwaye eyesihlanu yeyomgangatho omnye we cesium potassium. iglasi engenamlilo. Ukususela kuhlelo lokusebenza lokumelana nomlilo, iingcango zeglasi ezingenamlilo zingahlulwa zibe ngamabakala amathathu: imizuzu engama-30, imizuzu engama-60 kunye nemizuzu engama-90.