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Borosilicate Glass vs. Machinable Glass-ceramic

Both borosilicate glass and machinable glass-ceramic are glass and glass-ceramics. There are 24 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is borosilicate glass and the bottom bar is machinable glass-ceramic.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2000
310
Elastic (Young's, Tensile) Modulus, GPa 67 to 80
67
Flexural Strength, MPa 34 to 69
96
Fracture Toughness, MPa-m1/2 0.8
2.5
Knoop Hardness 510
250
Poisson's Ratio 0.21
0.29
Tensile Strength: Ultimate (UTS), MPa 280
84

Thermal Properties

Maximum Temperature: Mechanical, °C 360
760
Specific Heat Capacity, J/kg-K 830
790
Thermal Conductivity, W/m-K 1.2
1.2
Thermal Expansion, µm/m-K 3.3 to 5.1
21

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 4.8 to 5.5
6.0
Dielectric Constant (Relative Permittivity) At 1 MHz 5.4
6.4
Dielectric Strength (Breakdown Potential), kV/mm 5.0 to 34
27
Electrical Dissipation At 1 Hz 0.0026 to 0.018
0.0049
Electrical Dissipation At 1 MHz 0.0017 to 0.0088
0.0050
Electrical Resistivity Order of Magnitude, 10x Ω-m 9.0 to 12
14

Otherwise Unclassified Properties

Density, g/cm3 2.2 to 2.6
2.7

Common Calculations

Stiffness to Weight: Axial, points 15 to 17
14
Stiffness to Weight: Bending, points 55 to 61
51
Strength to Weight: Axial, points 30 to 35
8.8
Strength to Weight: Bending, points 36 to 43
16
Thermal Diffusivity, mm2/s 0.54 to 0.63
0.56
Thermal Shock Resistance, points 50 to 91
4.3