A review of delamination/durability tests was conducted, and tests were selected for comparative study. Reduced catalyst levels affected phenol-resorcinol formaldehyde (PRF) and catalyzed polyvinyl acetate (PVA) bond durability. Wood moisture content (MC) at the time of bonding affected PVA durability, but not PRF. Growth rate and density affected Douglas-fir bond durability. Density did not affect the results of slow-growth lodgepole pine.
In laminated wood, although all five delamination tests accepted conforming and rejected non-conforming PRF, only two tests rejected both non-conforming PRF and PVA. In fingerjoined lumber, delamination was sensitive to the final MC. Specimen length affected specimen-drying time, but its effect on delamination was not consistent. The NLGA delamination suggested lower bond durability than the WWPA durability-bending test.