Ucango lweglasi ekwaziyo ukumelana nomlilo lusenokugcinwa ngaphezulu kwemizuzu engama-90 ngaphandle kokugqabhuka phantsi kwempembelelo yedangatye ukuya kuthi ga kwi-1000 °C. Umnyango weglasi ovuthayo ongenamlilo unomsebenzi obalaseleyo womlilo, kwaye awuyi kuba naluphi na utshintsho oluchaphazela ukubonakala kunye nokusebenza phantsi kokukhanya kwexesha elide lemisebe ye-ultraviolet.