Ukwakheka kwamakhemikhali obuhlalu obuntantayo ikakhulukazi i-silicon dioxide ne-aluminium oxide.Inezici eziningi ezifana nezinhlayiya ezinhle, okungenalutho, isisindo esincane, amandla aphezulu, ukumelana nokugqoka, ukumelana nokushisa okuphezulu, ukufakwa kwe-thermal kanye ne-flame retardant.Isetshenziswa kabanzi Kweyodwa yezinto zokusetshenziswa embonini ye-refractory.