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Borosilicate Glass vs. Magnesium Fluoride

Borosilicate glass belongs to the glass and glass-ceramics classification, while magnesium fluoride belongs to the non-glass optical 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 borosilicate glass and the bottom bar is magnesium fluoride.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.4
5.2

Otherwise Unclassified Properties

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

Common Calculations

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