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Beryllia vs. CA

Beryllia and CA belong to fundamentally different material chemistries. Beryllia is a ceramic material, while CA is polymeric. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 12 material properties with values for both materials. Properties with values for just one material (22, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is beryllia and the bottom bar is CA.

Metric UnitsUS Customary Units

Mechanical Properties

Flexural Strength, MPa 240
40 to 55
Tensile Strength: Ultimate (UTS), MPa 140
30 to 37

Thermal Properties

Specific Heat Capacity, J/kg-K 1050
1500
Thermal Conductivity, W/m-K 270
0.25
Thermal Expansion, µm/m-K 8.0
14

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.6
3.6
Dielectric Strength (Breakdown Potential), kV/mm 11
15
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
16

Otherwise Unclassified Properties

Density, g/cm3 2.9
1.3

Common Calculations

Strength to Weight: Axial, points 14
6.4 to 7.9
Strength to Weight: Bending, points 21
17 to 19
Thermal Diffusivity, mm2/s 89
0.13