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Borosilicate Glass vs. Silicon Nitride

Borosilicate glass belongs to the glass and glass-ceramics classification, while silicon nitride belongs to the non-oxide engineering ceramics. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is borosilicate glass and the bottom bar is silicon nitride.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2000
600 to 2950
Elastic (Young's, Tensile) Modulus, GPa 67 to 80
140 to 310
Flexural Strength, MPa 34 to 69
130 to 810
Fracture Toughness, MPa-m1/2 0.8
3.1 to 6.2
Poisson's Ratio 0.21
0.24 to 0.27

Thermal Properties

Maximum Temperature: Mechanical, °C 360
1000 to 1330
Maximum Thermal Shock, °C 160
290 to 750
Specific Heat Capacity, J/kg-K 830
720 to 800
Thermal Conductivity, W/m-K 1.2
12 to 31
Thermal Expansion, µm/m-K 3.3 to 5.1
2.5 to 3.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.4
8.0 to 10
Dielectric Strength (Breakdown Potential), kV/mm 5.0 to 34
18
Electrical Resistivity Order of Magnitude, 10x Ω-m 9.0 to 12
11 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.2 to 2.6
2.2 to 3.4

Common Calculations

Stiffness to Weight: Axial, points 15 to 17
34 to 53
Stiffness to Weight: Bending, points 55 to 61
65 to 78
Thermal Diffusivity, m2/s 0.54 to 0.63
7.5 to 13