Alumina crucibles
Alumina crucibles

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Alumina Crucibles Engineered for Broad Applications, Tighter Budgets, Repeatable Performance and a Service Limit of 1700° C in Vacuum or Oxidizing Atmospheres

Zircoa’s performance engineered, hydraulically pressed, Composition 6105 delivers alumina crucibles with a uniform surface as well as precise, consistent, dimensional control from one order to the next. As a leader in the design, engineering and manufacturing of crucibles, you can depend upon Zircoa for expertise in the forming method appropriate to your application. 

For immediate delivery, we inventory the most common crucible sizes, with configurations to suit your particular needs. Ideal for induction melting of superalloy metals, in vacuum or oxidizing atmospheres. Markets served include: Aerospace, Crystal Growing, Dental, Mining, Pharmaceutical, Power Generation, Medical, Precious Metals and the processing of Zircon and Zirconia.

For Even Longer Crucible Life

Zirconium Oxide (ZrO2, A Grain Zirconia) is one of the best commercially available insulating materials. It has approximately 5 times the insulating value of alumina or magnesia. Using 1859 or 3001 Crucible Backup will extend crucible life and result in cleaner melts(


Physical Properties of Alumina and Zirconia Compositions

Backup Sizing
1859 3001


Tyler mesh
Tyler mesh
g/cm3 2.8
lbs/ft3 174.8
Porosity (%) 18
Modulus of Rupture
@ 70° (21°C)
psi 2800
Mpa 19.3
Thermal Expansion  
CTE R.T. to 600°C 7.0 x 10-6 in/in/°C
CTE R.T. to 1000°C 8.2 x 10-6 in/in/°C
CTE R.T. to 1300°C 8.8 x 10-6 in/in/°C

Refractory Backup (Thermal Insulation)

Extend the life of your furnace, and maintain tighter control over your furnace temperatures with Zircoa’s pre-sintered grog refractory backup (