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Magnesium Fluoride vs. Borosilicate Glass

Magnesium fluoride belongs to the non-glass optical ceramics classification, while borosilicate glass belongs to the glass and glass-ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is magnesium fluoride and the bottom bar is borosilicate glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 130
67 to 80
Poisson's Ratio 0.27
0.21

Thermal Properties

Melting Onset (Solidus), °C 1260
560
Specific Heat Capacity, J/kg-K 980
830
Thermal Conductivity, W/m-K 28
1.2
Thermal Expansion, µm/m-K 11
3.3 to 5.1

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.2
5.4

Otherwise Unclassified Properties

Density, g/cm3 3.2
2.2 to 2.6
Light Transmission Range, µm 0.12 to 7.0
0.3 to 2.5
Refractive Index 1.4
1.5

Common Calculations

Stiffness to Weight: Axial, points 22
15 to 17
Stiffness to Weight: Bending, points 52
55 to 61
Thermal Diffusivity, mm2/s 8.8
0.54 to 0.63