Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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Sources3 documents: Copper Development Association, Pilkington North America, Wieland
Copper C12200
C12200 phosphorus-deoxidized copper (DHP, the air-conditioning and refrigeration tube copper), tube annealed to 0.050 mm grain size (OS050), 0.065 in. wall, copper.org typical values
Glass
Annealed soda-lime-silica float glass, Pilkington North America Technical Bulletin ATS-129 (04/2025)
1
C12200 Alloy (copper.org)Copper Development Associationarchived copyCopper C12200 · Yield strength: typical, 0.5% extension under load, 0.065 in. tubeCopper C12200 · Ultimate tensile strength: typical, 0.065 in. tubeCopper C12200 · Elongation at break: typical, 0.065 in. tubeCopper C12200 · Young's modulus (stiffness): typicalCopper C12200 · Density: nominalCopper C12200 · Thermal conductivity: typical, 20 °CCopper C12200 · Thermal expansion: typical, mean 20-100 °CCopper C12200 · Specific heat: typical, 20 °CCopper C12200 · Melting point: liquidus
2
Technical Bulletin ATS-129: Properties of Soda-Lime Silica Float Glass (2025)Pilkington North Americaarchived copyGlass · Ultimate tensile strength: typical mean surface tensile stress at fracture (MOR), 60 s load, weathered, 50% breakage probabilityGlass · Flexural strength: mean MOR (same value as tensile)Glass · Young's modulus (stiffness): typicalGlass · Density: typicalGlass · Poisson's ratio: typicalGlass · Thermal conductivity: typical at 75 FGlass · Thermal expansion: typical, 75-575 FGlass · Specific heat: typical at 75 FGlass · Max service temperature: strain point (ASTM C336) - stress-relaxation onset, not a rated service limit
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Wieland-K19 (Cu-DHP, C12200) Data SheetWielandarchived copyCopper C12200 · Poisson's ratio: reference value at room temperature (Wieland-K19 = Cu-DHP = C12200, rolled products)
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Copper C12200 stronger than Glass?
Copper C12200 is stronger: its yield strength is 69 MPa against tensile strength 41 MPa for Glass (1.68x).
Which is lighter, Copper C12200 or Glass?
Glass is lighter: 2,500 kg/m³ against 8,941 kg/m³ for Copper C12200.
Which is stiffer, Copper C12200 or Glass?
Copper C12200 is stiffer: Young's modulus 117 GPa against 72 GPa for Glass, so the same part in Copper C12200 deflects less under the same load.
Which is lighter for the same job, Copper C12200 or Glass?
For the same stiffness or strength: Glass is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Copper C12200
Glass
Stiff rod or tie (tension)
2.2x heavier
lighter
Stiff beam (bending)
2.8x heavier
lighter
Stiff panel or plate
3.04x heavier
lighter
Strong rod or tie
2.13x heavier
lighter
Strong beam
2.53x heavier
lighter
Strong panel or plate
2.76x heavier
lighter
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Thermal
Which conducts heat better, Copper C12200 or Glass?
Copper C12200 conducts heat better: 339 W/m·K against 0.937 W/m·K for Glass.
Which expands less with temperature?
Glass expands less: 8.3 µm/m·K against 16.9 µm/m·K for Copper C12200.