Magnesia crucibles have found application in the superalloy industry, nuclear industry and chemicals industry where corrosion resistance is required.  Manufacture is by firing isostatically pressed or slip cast shapes made from fused magnesia.  Various purity grades are commercially available.  Additives are employed to promote sintering or restrict crystal growth.  These range from clay to yttria and alumina depending on application.  Crucibles with stability of 2300^oC in air, 1700^oC in reducing atmospheres, 1600^oC in vacuum and 1400^oC in hydrogen have been reported in the literature.

Purity:96--99%
Density: 3.20g/cm3
Thermal Shock: good