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
570
Poisson's Ratio
0.23
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
7.4
Dielectric Strength (Breakdown Potential)
13 kV/mm 0.51 V/mil
Electrical Dissipation At 1 MHz
0.0075
Electrical Resistivity Order of Magnitude
8.0 10x Ω-m
Otherwise Unclassified Properties
Density
2.4 g/cm3 150 lb/ft3
Light Transmission Range
0.35 to 2.5 µm
Refractive Index
1.5
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