Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
Wood Handbook (FPL-GTR-282), Chapter 12: Mechanical Properties of Wood-Based Composite MaterialsUSDA Forest Products LaboratoryUltimate tensile strength: modulus of rupture (no direct tensile value)Flexural strength: static bending MOR (Douglas-fir); range 33.72-42.61 across speciesYoung'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 copyThermal 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 LaboratoryThermal expansion: base material: solid wood parallel to grain, ovendry, range across speciesSpecific heat: base material: solid wood (all species), 12% MC, 27 C
Plywood has a thermal conductivity of 0.12 W/m·K (0.0693 BTU/hr·ft·°F). Basis: APA-recommended design value (Douglas-fir plywood), as reported by FPL/ORNL. Source: USDA Forest Products Laboratory, Thermal Properties of Wood and Wood Panel Products for Use in Buildings (1988)archived copy.
Specific heat of Plywood
The specific heat capacity of Plywood is 1,700 J/kg·K (0.406 BTU/lb·°F). Basis: base material: solid wood (all species), 12% MC, 27 C. Source: USDA Forest Products Laboratory, Wood Handbook (FPL-GTR-282), Chapter 4: Moisture Relations and Physical Properties of Wood.
Coefficient of thermal expansion of Plywood
Plywood expands 3.1–4.5 µm/m·K (1.72–2.5 µin/in·°F): a 100 mm part grows 19 µm over a 50 °C rise. Basis: base material: solid wood parallel to grain, ovendry, range across species. Source: USDA Forest Products Laboratory, Wood Handbook (FPL-GTR-282), Chapter 4: Moisture Relations and Physical Properties of Wood.