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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PLEXIGLAS GS and XT Technical Information (Ref. No. 211-1)Röhmarchived copyPlastic PMMA · Ultimate tensile strength: typical, 23 °CPlastic PMMA · Compressive strength: compressive yield stress, typicalPlastic PMMA · Flexural strength: typicalPlastic PMMA · Elongation at break: typicalPlastic PMMA · Young's modulus (stiffness): typical, short-termPlastic PMMA · Density: typicalPlastic PMMA · Poisson's ratio: typicalPlastic PMMA · Thermal conductivity: typicalPlastic PMMA · Thermal expansion: 0-50 °CPlastic PMMA · Specific heat: typicalPlastic PMMA · Max service temperature: max. permanent service temperature
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Wood Handbook (FPL-GTR-282), Chapter 12: Mechanical Properties of Wood-Based Composite MaterialsUSDA Forest Products LaboratoryPlywood · Ultimate tensile strength: modulus of rupture (no direct tensile value)Plywood · Flexural strength: static bending MOR (Douglas-fir); range 33.72-42.61 across speciesPlywood · Young's modulus (stiffness): static bending MOE of the panel (Douglas-fir); range 6.96-8.55 across species
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Thermal Properties of Wood and Wood Panel Products for Use in Buildings (1988)USDA Forest Products Laboratoryarchived copyPlywood · Thermal conductivity: APA-recommended design value (Douglas-fir plywood), as reported by FPL/ORNL
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Wood Handbook (FPL-GTR-282), Chapter 4: Moisture Relations and Physical Properties of WoodUSDA Forest Products LaboratoryPlywood · Thermal expansion: base material: solid wood parallel to grain, ovendry, range across speciesPlywood · Specific heat: base material: solid wood (all species), 12% MC, 27 C
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 Plastic PMMA stronger than Plywood?
Plastic PMMA is stronger: its tensile strength is 80 MPa against 41.4 MPa for Plywood (1.93x).
Which is stiffer, Plastic PMMA or Plywood?
Plywood is stiffer: Young's modulus 7.45 GPa against 3.3 GPa for Plastic PMMA, so the same part in Plywood deflects less under the same load.
Thermal
Which conducts heat better, Plastic PMMA or Plywood?
Plastic PMMA conducts heat better: 0.19 W/m·K against 0.12 W/m·K for Plywood.
Which expands less with temperature?
Plywood expands less: 3.8 µm/m·K against 70 µm/m·K for Plastic PMMA.