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Optical Silicon vs. ZA-12

Optical silicon and ZA-12 belong to fundamentally different material chemistries. Optical silicon is a ceramic material, while ZA-12 is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 19 material properties with values for both materials. Properties with values for just one material (21, 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 optical silicon and the bottom bar is ZA-12.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 120
230 to 270
Elastic (Young's, Tensile) Modulus, GPa 150
83
Fracture Toughness, MPa-m1/2 3.5
14 to 15
Knoop Hardness 1130
110 to 130
Poisson's Ratio 0.28
0.26
Shear Modulus, GPa 80
33
Tensile Strength: Ultimate (UTS), MPa 110
260 to 400

Thermal Properties

Maximum Temperature: Mechanical, °C 1350
100
Melting Onset (Solidus), °C 1560
380
Specific Heat Capacity, J/kg-K 700
450
Thermal Conductivity, W/m-K 150
120
Thermal Expansion, µm/m-K 3.0
24

Otherwise Unclassified Properties

Density, g/cm3 2.3
6.0

Common Calculations

Stiffness to Weight: Axial, points 35
7.6
Stiffness to Weight: Bending, points 75
24
Strength to Weight: Axial, points 13
12 to 19
Strength to Weight: Bending, points 22
15 to 20
Thermal Diffusivity, mm2/s 93
43
Thermal Shock Resistance, points 18
9.4 to 14