Chapter 20 Heat Sterilization of Wood
Figure 20–1. Dependence of heating time on wet-bulb depression for (a) 1- to 2-in.-thick
ponderosa pine boards; (b) 4- to 12-in. ponderosa pine timbers; (c) 3/4- to 1-1/2-in.-thick
Douglas-fir boards; and (d) 3-1/2- by 3-1/2-in. Douglas-fir timbers (initial temperature: 60 °F).
(°C = (°F – 32)/1.8; 1 in. = 25.4 mm)Figure 20–2. Effect of species on heating times of boards and squares. RM, red maple; SM, sugar
maple; RO, red oak; BA, basswood; AS, aspen. The solid rectangle represents 2 °F (1.1 °C) wet-
bulb depression. The entire rectangle represents 10 °F (5.6 °C) wet-bulb depression.