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Graphite Crucibles Grade 2020 offer high performance with good technical and economic effect. They are used in metallurgy, casting, chemical and (scientific) industry in general; they are also used to produce alloy tool steel melting and non-ferrous metal and alloy melting.

Graphite material is oxidised under heat in an air environment, so it is largely used in inert environments and vacuum applications such as in the manufacture of semiconductors and its also used by the nuclear industry. The grade 2020 material we use at Almath has similar properties to our Boron Nitride material allowing for use at extreme temperatures (up to 2760°C), in an inert atmosphere.

Maximum service temperature is 427oC, maximum inert atmosphere service temperature is 2760oC.

Key Benefits

  • Technological Merit
  • Good mechanical strength
  • Long life: Due to a the excellent chemical stability, corrosion, erosion and temperature resistance, the material is afforded a long lifespan.
  • High heat conduction performance and resistance to thermal shock: Possible to use even at 2760°C in inert atmosphere, high thermal shock resistance at high temperatures.
  • Excellent corrosion resistance: Resistance is excellent against a wide range of acid and alkaline environments, great degree of chemical stability.

Material Properties

Property Unit Value
Bulk Density g/cm3 1.77
Flexural Strength MPa 45
Tensile Strength MPa 29
Compressive Strength MPa 98
Specific Resistance μ 1550
Grain Size µm 15
Hardness – Shore 52
Hardness – Rockwell H 95
Coefficient of thermal expansion (400 to 500oC) oC 4.3 x 10E-6
Porosity % 9
Thermal Conductivity W/moC 85
Modulus of Elasticity GPa 9.2
Ash ppm 750
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