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