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Fused Silica vs. Barium Fluoride

Fused silica belongs to the glass and glass-ceramics classification, while barium fluoride belongs to the non-glass optical ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (12, 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 fused silica and the bottom bar is barium fluoride.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
60
Knoop Hardness 570
80
Poisson's Ratio 0.17
0.32
Shear Modulus, GPa 31
25

Thermal Properties

Melting Onset (Solidus), °C 1900
1370
Specific Heat Capacity, J/kg-K 720
420
Thermal Conductivity, W/m-K 1.4
9.0
Thermal Expansion, µm/m-K 0.5
18

Otherwise Unclassified Properties

Density, g/cm3 2.2
4.9
Light Transmission Range, µm 0.16 to 3.5
0.15 to 13
Refractive Index 1.5
1.6

Common Calculations

Stiffness to Weight: Axial, points 18
6.8
Stiffness to Weight: Bending, points 63
27
Thermal Diffusivity, mm2/s 0.85
4.4