Variability in the mechanical properties of commercially available thermally modified hardwood lumber

Research indicates that users of thermally modified wood lack information regarding the improved performance and any variations may exist for “same” product when manufactured by different companies. The goal this study was to evaluate variability in mechanical properties three hardwoods determine between manufacturers. To hardness, bending (modulus elasticity module rupture) shrinkage values, testing conducted following ASTM standard D143. samples were conditioned at 20 °C a relative humidity 65% until they reached an equilibrium moisture content before testing. Analysis variance used within processes each company. Seven out 18 (39%) tests indicated there statistical differences performances samples. Yellow poplar had least variation companies (only difference content, EMC) red maple most (hardness, tangential shrinkage, EMC). While means these statistically different, application hardness EMC are slight. For example, largest 83.6 kg, 0.45% 1.37% EMC. These suggested be inconsequential compared values species untreated wood.