The bonding strength of the engineered flooring
samples, non-treated (before boiling), made using the
MF resin and PVAc increased as the MF resin content
was increased. Because the hot-press temperature of
120 1C was high, MF resin was cured as a thermosetting
adhesive. On the basis of KS F3110 method, we boiled
the samples at 60 3 1C for 4 h, dried themfor 20 h,
boiled themagain for 4 h and finally dried themfor 3 h
to determine the waterproof property of each adhesive
system. This result also showed the tendency of the
bonding strength to increase as the MF resin content
was increased. When only PVAc was used, there was no
waterproof property. We found that PVAc was weak in
water.