Long-term dimension stability experiment was designed
to investigate the time-dependent characteristics of water
absorption and thickness swelling. From long-term data, relevant
property parameters of boards under the equilibrium
state were obtained. Since the entire properties of the 5%
pMDI BPBs were better than those of the 3% pMDI panels
and higher wax content levels did not offer positive effects
on discussed properties, the following discussion on the
long-term WA and TS experiments is only on the 5% pMDI
BPBs with comparative lower wax contents (i.e., from 1 to
2.5%).