Wang, XipingForsman, John WErickson, John R2023-09-132023-09-132004-09https://hdl.handle.net/11299/256897Heat Sterilization of lumber, timbers and pallets is currently used to kill insects to prevent their transfer between countries in international trade. A typical requirement is that the center of any wood configuration be held at 133 °F (56 °C) for 30 min. However, the time required for the center to reach this temperature can vary widely depending on a number of factors such as wood species, physical prope1iies, cross-sectional dimensions, and heating medium, etc. The overall objective of this project was to quantify the effects of wood species, cross-sectional dimension, and heating medium on the time required to heat the center of hardwood lumber and timbers to 133 °Fat a heating temperature of 160 °F (71 °C). A stress wave E-rating procedure was also added to examine if the stress wave properties of lumber and timbers can be any useful in predicting heating times for untested species in the future.enNatural Resources Research InstituteUniversity of Minnesota DuluthTechnical Report