... .Used for metal casting or ceramic sample preparation, etc. Magnesium oxide ceramic crucible (1) Material: MgO 90;MgO 96;MgO 99 ... .(3) Application:Fireproof material, refractory, magnesium oxide bricks, MgO board, abrasive, fertilizer, water retention material, feed additive, paper making, etc.Specification:Physical ... constant 1.0 MHz-- --5.8Max size-- --250mm long Magnesium oxide ceramic crucible