Investigation of the penetrability of various glues [urea-formaldehyde resi
n (UF-resin), phenol-formaldehyde resin (PF-resin), melamine-urea-phenol-fo
rmaldehyd made of pine sapwood and heartwood revealed: the various glues pe
netrate chips from pine sapwood regardless of tree age, height of the sampl
e studied and surface structure deeper than in those made of heartwood. The
various glues more deeply penetrate chips from sapwood and heartwood of th
e 48-year-old pine than chips from sapwood and heartwood of the 124-year-ol
d pine. The penetrability of various glues in chips from sapwood and heartw
ood of the 124-year-old pine increases with increasing height of the sample
studied. Moreover, glues penetrate sanded surfaces of chips from sapwood a
nd heartwood of the 48- und the 124-year-old pine to a lesser extent than u
nsanded chip surfaces.