Materials / Glass
Glass
Glass strength, stiffness, density and thermal properties, with their source.
A panel in Glass, smooth finish.
| Process | Natural |
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| Mechanical |
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| Yield strength | not given (tensile used) |
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| Ultimate tensile strength | 41MPasourcetypical mean surface tensile stress at fracture (MOR), 60 s load, weathered, 50% breakage probability |
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| Flexural strength | 41MPasourcemean MOR (same value as tensile) |
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| Elongation at break | not sourced |
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| Young's modulus (stiffness) | 72GPasourcetypical |
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| Density | 2,500kg/m³sourcetypical |
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| Strength to weight | 16.4kN·m/kg |
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| Stiffness to weight | 28.8MN·m/kg |
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| Poisson's ratio | 0.22sourcetypical |
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| Shear modulus | 29.5GPa |
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| Bulk modulus | 42.9GPa |
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| Speed of sound | 5,367m/s |
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| Thermal |
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| Thermal conductivity | 0.937W/m·Ksourcetypical at 75 F |
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| Thermal expansion | 8.3µm/m·Ksourcetypical, 75-575 F |
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| 100 mm part over a 50 °C swing | 41.5µm growth |
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| Specific heat | 880J/kg·Ksourcetypical at 75 F |
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| Heats up and cools (diffusivity) | 0.426mm²/s |
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| Thermal shock resistance | 50.1W/m |
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| Max service temperature | 511°Csourcestrain point (ASTM C336) - stress-relaxation onset, not a rated service limit |
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| Values for | Annealed soda-lime-silica float glass, Pilkington North America Technical Bulletin ATS-129 (04/2025) |
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Among 59 materials
Stiffness against densityStrength against density