Steatite vs. Borosilicate Glass

Steatite belongs to the oxide-based engineering ceramics classification, while borosilicate glass belongs to the glass and glass-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 steatite and the bottom bar is borosilicate glass.

Steatite Borosilicate Glass

Metric UnitsUS Customary Units

Mechanical Properties

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

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

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

Poisson's Ratio		0.23
Poisson's Ratio		0.21

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

Thermal Properties

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

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

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

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

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

Electrical Properties

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

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

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

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

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

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

Otherwise Unclassified Properties

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

Common Calculations

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

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

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

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

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

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