... Magnesium oxide ceramic crucible (1) Material: MgO 90;MgO 96;MgO 99 98%, 99%, 99.4%, 99.8(2) Product Description:Caustic calcined ... pharmaceuticals, rubber making, and building material industry etc.(3) Application:Fireproof material, refractory, magnesium oxide bricks, MgO board, abrasive, fertilizer, water retention ... constant 1.0 MHz-- --5.8Max size-- --250mm long Magnesium oxide ceramic crucible