# Limestone

Limestone is a type of common industrial natural stone. It has the highest tensile strength and the lowest thermal conductivity among natural stone materials. The graph bars on the material properties cards below compare limestone to other natural stone materials (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Compressive (Crushing) Strength

700 *MPa* 100 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

77 *GPa* 11 *x 10 ^{6} psi*

Poisson's Ratio

0.25

Shear Modulus

30 *GPa* 4.4 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

100 *MPa* 15 *x 10 ^{3} psi*

## Thermal Properties

Maximum Temperature: Mechanical

360 *°C* 670 *°F*

Specific Heat Capacity

920 *J/kg-K* 0.22 *BTU/lb-°F*

Thermal Conductivity

2.1 *W/m-K* 1.2 *BTU/h-ft-°F*

Thermal Expansion

8.0 *µm/m-K*

## Other Material Properties

Density

2.6 *g/cm ^{3}* 160

*lb/ft*

^{3}Dielectric Strength (Breakdown Potential)

8.0 *kV/mm* 0.31 *V/mil*

## Common Calculations

Stiffness to Weight: Axial

16 *points*

Stiffness to Weight: Bending

55 *points*

Strength to Weight: Axial

11 *points*

Strength to Weight: Bending

18 *points*

Thermal Diffusivity

0.88 *m ^{2}/s*

Thermal Shock Resistance

12 *points*

## Followup Questions

## Further Reading

ASTM C242: Standard Terminology of Ceramic Whitewares and Related Products

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015