Ngemuva kokuthi isicabha sengilazi esingashi sichayeke ekushiseni okuphezulu, ijeli esobala efana nesendlalelo seglue esingashi phakathi nengilazi izoqina ngokushesha ukuze yakhe ibhodi lokuvikela elingashisi opaque. Umnyango wengilazi ongashi wekhwalithi ephezulu usengahlala isikhathi esingaphezu kwamaminithi angu-90 ngaphansi komthelela welangabi ofika ku-1000 ℃, ophinde uzuze isikhathi esibalulekile sokuphunyuka kwabantu kanye nokusiza ezinhlekeleleni.