Ukwakheka kweekhemikhali zamaso adadayo ikakhulu yisilicon dioxide kunye nealuminiyam oxide.Ineempawu ezininzi ezinje ngamasuntswana amahle, ihollow, ubunzima obulula, amandla aphezulu, ukumelana nokunxiba, ukumelana nobushushu obuphezulu, ukugqunywa kwe-thermal kunye ne-flame retardant.Isetyenziswa ngokubanzi kwenye yezixhobo ekrwada kushishino refractory.