Borosilicate Glass vs. Steatite

Borosilicate glass belongs to the glass and glass-ceramics classification, while steatite belongs to the oxide-based engineering ceramics. There are 23 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 steatite.

Borosilicate Glass Steatite

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa		2000
Compressive (Crushing) Strength, MPa		540 to 620

Elastic (Young's, Tensile) Modulus, GPa		67 to 80
Elastic (Young's, Tensile) Modulus, GPa		68 to 120

Flexural Strength, MPa		34 to 69
Flexural Strength, MPa		32 to 150

Poisson's Ratio		0.21
Poisson's Ratio		0.23

Tensile Strength: Ultimate (UTS), MPa		280
Tensile Strength: Ultimate (UTS), MPa		60 to 220

Thermal Properties

Maximum Temperature: Mechanical, °C		360
Maximum Temperature: Mechanical, °C		750 to 1230

Maximum Thermal Shock, °C		160
Maximum Thermal Shock, °C		90 to 160

Specific Heat Capacity, J/kg-K		830
Specific Heat Capacity, J/kg-K		850 to 860

Thermal Conductivity, W/m-K		1.2
Thermal Conductivity, W/m-K		1.8 to 2.5

Thermal Expansion, µm/m-K		3.3 to 5.1
Thermal Expansion, µm/m-K		7.0 to 9.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz		4.8 to 5.5
Dielectric Constant (Relative Permittivity) At 1 Hz		6.0

Dielectric Constant (Relative Permittivity) At 1 MHz		5.4
Dielectric Constant (Relative Permittivity) At 1 MHz		5.7 to 6.5

Dielectric Strength (Breakdown Potential), kV/mm		5.0 to 34
Dielectric Strength (Breakdown Potential), kV/mm		7.9 to 16

Electrical Dissipation At 1 Hz		0.0026 to 0.018
Electrical Dissipation At 1 Hz		0.0014 to 0.022

Electrical Dissipation At 1 MHz		0.0017 to 0.0088
Electrical Dissipation At 1 MHz		0.0010 to 0.0060

Electrical Resistivity Order of Magnitude, 10^x Ω-m		9.0 to 12
Electrical Resistivity Order of Magnitude, 10^x Ω-m		8.0 to 11

Otherwise Unclassified Properties

Density, g/cm³		2.2 to 2.6
Density, g/cm³		1.9 to 2.8

Common Calculations

Stiffness to Weight: Axial, points		15 to 17
Stiffness to Weight: Axial, points		14 to 32

Stiffness to Weight: Bending, points		55 to 61
Stiffness to Weight: Bending, points		52 to 83

Strength to Weight: Axial, points		30 to 35
Strength to Weight: Axial, points		6.4 to 32

Strength to Weight: Bending, points		36 to 43
Strength to Weight: Bending, points		13 to 42

Thermal Diffusivity, mm²/s		0.54 to 0.63
Thermal Diffusivity, mm²/s		0.79 to 1.1

Thermal Shock Resistance, points		50 to 91
Thermal Shock Resistance, points		5.1 to 33