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High Voltage Borosilicate vs. Soda-lime Glass

Both high voltage borosilicate and soda-lime glass are glass and glass-ceramics. There are 19 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is high voltage borosilicate and the bottom bar is soda-lime glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 80
70 to 71
Knoop Hardness 510
570
Poisson's Ratio 0.21
0.23
Tensile Strength: Ultimate (UTS), MPa 280
41 to 180

Thermal Properties

Maximum Temperature: Mechanical, °C 360
300
Specific Heat Capacity, J/kg-K 830
720 to 800
Thermal Conductivity, W/m-K 1.2
1.0 to 1.1
Thermal Expansion, µm/m-K 5.1
8.8 to 9.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.4
7.3 to 7.4
Dielectric Strength (Breakdown Potential), kV/mm 34
13

Otherwise Unclassified Properties

Density, g/cm3 2.6
2.4
Light Transmission Range, µm 0.3 to 2.5
0.35 to 2.5
Refractive Index 1.5
1.5

Common Calculations

Stiffness to Weight: Axial, points 17
16
Stiffness to Weight: Bending, points 55
56
Strength to Weight: Axial, points 30
4.6 to 20
Strength to Weight: Bending, points 36
11 to 28
Thermal Diffusivity, mm2/s 0.54
0.51 to 0.6
Thermal Shock Resistance, points 50
4.7 to 20