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Boron Carbide vs. Borosilicate Glass

Boron carbide belongs to the non-oxide engineering ceramics classification, while borosilicate glass belongs to the glass and glass-ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is boron carbide and the bottom bar is borosilicate glass.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1710 to 2200
2000
Elastic (Young's, Tensile) Modulus, GPa 240 to 460
67 to 80
Flexural Strength, MPa 170 to 410
34 to 69
Fracture Toughness, MPa-m1/2 2.5 to 3.5
0.8
Knoop Hardness 2600 to 3200
510
Poisson's Ratio 0.17 to 0.19
0.21
Tensile Strength: Ultimate (UTS), MPa 350
280

Thermal Properties

Maximum Temperature: Mechanical, °C 1000 to 2500
360
Specific Heat Capacity, J/kg-K 950
830
Thermal Conductivity, W/m-K 31 to 90
1.2
Thermal Expansion, µm/m-K 4.5 to 5.6
3.3 to 5.1

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
5.4
Electrical Resistivity Order of Magnitude, 10x Ω-m 0 to 11
9.0 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.1 to 2.7
2.2 to 2.6

Common Calculations

Stiffness to Weight: Axial, points 63 to 100
15 to 17
Stiffness to Weight: Bending, points 91 to 100
55 to 61
Strength to Weight: Axial, points 37 to 47
30 to 35
Strength to Weight: Bending, points 42 to 53
36 to 43
Thermal Diffusivity, mm2/s 16 to 38
0.54 to 0.63
Thermal Shock Resistance, points 9.7 to 20
50 to 91