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Fused Silica vs. ZA-12

Fused silica and ZA-12 belong to fundamentally different material chemistries. Fused silica 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 18 material properties with values for both materials. Properties with values for just one material (26, 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 ZA-12.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1100
230 to 270
Elastic (Young's, Tensile) Modulus, GPa 73
83
Knoop Hardness 570
110 to 130
Poisson's Ratio 0.17
0.26
Shear Modulus, GPa 31
33
Tensile Strength: Ultimate (UTS), MPa 50
260 to 400

Thermal Properties

Maximum Temperature: Mechanical, °C 1080
100
Melting Onset (Solidus), °C 1900
380
Specific Heat Capacity, J/kg-K 720
450
Thermal Conductivity, W/m-K 1.4
120
Thermal Expansion, µm/m-K 0.5
24

Otherwise Unclassified Properties

Density, g/cm3 2.2
6.0

Common Calculations

Stiffness to Weight: Axial, points 18
7.6
Stiffness to Weight: Bending, points 63
24
Strength to Weight: Axial, points 6.3
12 to 19
Strength to Weight: Bending, points 14
15 to 20
Thermal Diffusivity, mm2/s 0.85
43
Thermal Shock Resistance, points 97
9.4 to 14