Important is also resin type used
The lowest swelling was observed when phenol-formaldehyde or pMDI adhesive were used
The highest swelling was observed when urea-formaldehyde adhesive was used
During pressing,blended particles are exposed to the high temperature that can also cause some degradation.
Temperature during pressing is needed for the adhesive to cure and particles to cross link and overlap
The stronger the bond between cross-linked and overlapped particles the better the sorption properties should be.