Ubushushu obuthambileyo beglasi yesiqhelo kubushushu obuphezulu bumalunga ne-700 ℃, ngelixa indawo yokuthambisa yeglasi entsha yokutshisa iglasi ingaphezulu kwe-1200 ℃, ephantse ithelekiswe neglasi yequartz yomgangatho ophezulu, kodwa inexabiso eliphantsi kunequartz. iglasi ngokwexabiso.

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