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Annealed Soda-Lime Glass

Annealed soda-lime glass is a grade of soda-lime glass. The graph bars on the material properties cards below compare annealed soda-lime glass to other glass and glass-ceramics (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

330 MPa 47 x 103 psi

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Flexural Strength

100 MPa 15 x 103 psi

Fracture Toughness

0.75 MPa-m1/2 0.68 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Shear Modulus

29 GPa 4.1 x 106 psi

Tensile Strength: Ultimate (UTS)

41 MPa 5.9 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

300 °C 570 °F

Specific Heat Capacity

800 J/kg-K 0.19 BTU/lb-°F

Thermal Conductivity

1.0 W/m-K 0.58 BTU/h-ft-°F

Thermal Expansion

8.8 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

13 kV/mm 0.51 V/mil

Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

8.0 10x Ω-m

Otherwise Unclassified Properties


2.4 g/cm3 150 lb/ft3

Light Transmission Range

0.35 to 2.5 µm

Refractive Index


Common Calculations

Stiffness to Weight: Axial

16 points

Stiffness to Weight: Bending

56 points

Strength to Weight: Axial

4.6 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

0.51 mm2/s

Thermal Shock Resistance

4.7 points

Followup Questions

Further Reading

Glass Construction Manual, Christian Schittich et al., 1999

Dictionary of Glass: Materials and Techniques, Charles Bray, 2002

Glass: Mechanics and Technology, Eric Le Bourhis, 2007