Don kofofin gilashin da ke hana wuta, gutsuttssun sun zama ƴaƴan ɓangarorin guda ɗaya, kuma babu wani kusurwoyi masu kaifi kamar wuƙaƙen gilashi, don haka ana kiransa gilashin aminci. Ƙofar gilashin wuta mai hana wuta, tare da firam ɗin, na iya saduwa da kwanciyar hankali da amincin wuta a cikin wani ɗan lokaci, kuma yana da ayyuka na musamman na rigakafin wuta, keɓewar hayaki da juriya mai zafi.