... crucible 1.Made of magnesium oxide 2.Used for metal casting or ceramic sample preparation, etc. Magnesium oxide ceramic crucible (1) Material ... husbandry, papermaking, production of pharmaceuticals, rubber making, and building material industry etc.(3) Application:Fireproof material, refractory, magnesium oxide bricks, MgO ... 1.0 MHz-- --5.8Max size-- --250mm long Magnesium oxide ceramic crucible