Limestone vs. Mullite

Limestone belongs to the natural stone classification, while mullite belongs to the oxide-based engineering ceramics. There are 16 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is limestone and the bottom bar is mullite.

Limestone Mullite

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa		700
Compressive (Crushing) Strength, MPa		800

Elastic (Young's, Tensile) Modulus, GPa		77
Elastic (Young's, Tensile) Modulus, GPa		110 to 170

Poisson's Ratio		0.25
Poisson's Ratio		0.25

Tensile Strength: Ultimate (UTS), MPa		100
Tensile Strength: Ultimate (UTS), MPa		160

Thermal Properties

Maximum Temperature: Mechanical, °C		360
Maximum Temperature: Mechanical, °C		1680

Specific Heat Capacity, J/kg-K		920
Specific Heat Capacity, J/kg-K		950

Thermal Conductivity, W/m-K		2.1
Thermal Conductivity, W/m-K		3.5 to 11

Thermal Expansion, µm/m-K		8.0
Thermal Expansion, µm/m-K		5.8

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		8.0
Dielectric Strength (Breakdown Potential), kV/mm		16 to 17

Otherwise Unclassified Properties

Density, g/cm³		2.6
Density, g/cm³		2.7 to 3.0

Common Calculations

Stiffness to Weight: Axial, points		16
Stiffness to Weight: Axial, points		22 to 31

Stiffness to Weight: Bending, points		55
Stiffness to Weight: Bending, points		58 to 62

Strength to Weight: Axial, points		11
Strength to Weight: Axial, points		15 to 17

Strength to Weight: Bending, points		18
Strength to Weight: Bending, points		22 to 24

Thermal Diffusivity, mm²/s		0.88
Thermal Diffusivity, mm²/s		1.4 to 3.7

Thermal Shock Resistance, points		12
Thermal Shock Resistance, points		12 to 19