thermal expansion. wood and plywood expand upon heating as do practically all solids. the thermal expansion of plywood is quite small. the average co-efficient of thermal expansion of plywood is 4.5 x 10-6mm/mm/oc. thermal conductivity. the ability of a material to conduct heat is measured by its thermal conductivity, k.
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thermal expansion doesn't have much of an effect on plywood; it expands minimally per inch of the panel's length for every one degree fahrenheit of temperature increase, and that's only when the majority of the panel's plies have grain that's perpendicular to the panel surface.
the average coefficient of linear thermal expansion is about 6.1×10 −6 mm −1 c −1 for a plywood panel with 60% of the plies or less running perpendicular to the direction of expansion. the coefficient of thermal expansion in panel thickness is approximately 28.8×10 −6 mm −1 c −1.
the average coefficient of linear thermal expansion is about 3.4 x 10-6 inch/inch per degree f for a plywood panel with 60 percent of the plies or less running perpendicular to the face. the coefficient of thermal expansion for panel thickness is approximately 16 x 10-6 inch/inch per degree f.
thermal insulation. this is actually the reciprocal of the thermal conductivity. divide 1 by the thermal conductivity to get the thermal insulating value, also known as r. in the case of plywood, it is 1/0.13, or 7.69 m*k/watt. thermal expansion coefficient. as the temperature around a piece of wood changes, so does the size of that piece of wood.