3. Results and discussion
The Ra//, and Ra⊥ values of thermally modified plywood panels
at each exposure condition are shown in Table 2. The panels treated
at 150 ◦C for 60 min had the smoothest surface with an Ra// value
of 3.96m while the roughest surface was found for the panels
modified with 190 ◦C having an Ra// value of 4.56m. The average
surface roughness value (Ra//) of the panels modified with 150 ◦C