PES vs. Forsterite

PES and forsterite belong to fundamentally different material chemistries. PES is a polymeric material, while forsterite is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 9 material properties with values for both materials. Properties with values for just one material (22, in this case) are not shown.

For each property being compared, the top bar is PES and the bottom bar is forsterite.

Polyethersulfone (PES)Forsterite (Mg₂SiO₄)

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		1.4
Density, g/cm³		2.1 to 3.1

Dielectric Constant (Relative Permittivity) At 1 MHz		3.5
Dielectric Constant (Relative Permittivity) At 1 MHz		6.2

Dielectric Strength (Breakdown Potential), kV/mm		16
Dielectric Strength (Breakdown Potential), kV/mm		7.9

Electrical Dissipation At 1 MHz		0.0035
Electrical Dissipation At 1 MHz		0.00030

Flexural Strength, MPa		130
Flexural Strength, MPa		40 to 160

Specific Heat Capacity, J/kg-K		1100
Specific Heat Capacity, J/kg-K		850

Thermal Conductivity, W/m-K		0.18
Thermal Conductivity, W/m-K		1.7 to 3.5

Thermal Diffusivity, mm²/s		0.12
Thermal Diffusivity, mm²/s		0.94 to 1.3

Thermal Expansion, µm/m-K		53
Thermal Expansion, µm/m-K		9.0 to 10

PES vs. Forsterite

Material Properties

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