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quartz with silicon nitride ( Q95F )
approx.- 95% quartz
magnesium oxide ( MG-95-VG )
95% MgO
zirconium-oxide ( ZR-G )
ZrO2 approx.- 8% Y2O3-stab
spinel ( SP-30-G )
Al2O3 70% MgO 30%
aluminium-oxide ( AL99-G )
99.7% Al2O3
ZrO2 approx.- 8% Y2O3-stab.
quartz ( Q100 )
approx.- 99% quartz