... metal casting or ceramic sample preparation, etc. Magnesium oxide ceramic crucible (1) Material: MgO 90;MgO 96;MgO 99 98%, 99 ... making, and building material industry etc.(3) Application:Fireproof material, refractory, magnesium oxide bricks, MgO board, abrasive, fertilizer, water retention material ... .0 MHz-- --5.8Max size-- --250mm long Magnesium oxide ceramic crucible