A wood based material may be formed having {HEAD ~ a permeability} which is at least 5 times that of {TAIL ~ the untreated wood} 
A wood based material may be formed having { HEAD ~ a permeability } which is at least 5 times that of { TAIL ~ the untreated wood }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL