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Low Expansion Glass-ceramic vs. Silver Bromide

Low expansion glass-ceramic belongs to the glass and glass-ceramics classification, while silver bromide belongs to the non-glass optical ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (10, 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 low expansion glass-ceramic and the bottom bar is silver bromide.

Low Expansion Glass-CeramicSilver Bromide (AgBr) Optical Material
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
32

Thermal Properties

Specific Heat Capacity, J/kg-K 800
290
Thermal Conductivity, W/m-K 1.5
1.2
Thermal Expansion, µm/m-K 1.7
30

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.7
13

Otherwise Unclassified Properties

Density, g/cm3 2.4
6.5
Light Transmission Range, µm 0.5 to 2.7
0.45 to 35
Refractive Index 1.5
2.3

Common Calculations

Stiffness to Weight: Axial, points 19
2.7
Stiffness to Weight: Bending, points 59
16
Thermal Diffusivity, mm2/s 0.76
0.64