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Fused Silica vs. Glass-bonded Mica

Both fused silica and glass-bonded mica are glass and glass-ceramics. There are 19 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is fused silica and the bottom bar is glass-bonded mica.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1100
270
Elastic (Young's, Tensile) Modulus, GPa 73
71
Flexural Strength, MPa 67
79
Tensile Strength: Ultimate (UTS), MPa 50
39

Thermal Properties

Maximum Temperature: Mechanical, °C 1080
450
Specific Heat Capacity, J/kg-K 720
500
Thermal Conductivity, W/m-K 1.4
23
Thermal Expansion, µm/m-K 0.5
6.7

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.8
6.8
Dielectric Strength (Breakdown Potential), kV/mm 30
20
Electrical Dissipation At 1 MHz 0.00011
0.0016
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
10

Otherwise Unclassified Properties

Density, g/cm3 2.2
2.6

Common Calculations

Stiffness to Weight: Axial, points 18
15
Stiffness to Weight: Bending, points 63
52
Strength to Weight: Axial, points 6.3
4.1
Strength to Weight: Bending, points 14
9.7
Thermal Diffusivity, mm2/s 0.85
18
Thermal Shock Resistance, points 97
5.9