Gluability of Loblolly Pine Earlywood and Latewood<sup>1</sup>
AbstractAdhesive-bond quality of the following growth zone combinations of loblolly pine was evaluated with an epoxy, a resorcinol-formaldehyde, and a phenolic adhesive: latewood to latewood, earlywood to earlywood, and latewood to earlywood. For latewood-to-latewood bonds, the influence of each of two surface treatments—(a) alcohol-benzene solution and (b) sodium hydroxide solution with each of the three adhesives—was also evaluated. Bonds of latewood-to-latewood zones were poor with all adhesives; surface treatments did not improve bond quality. In assemblies of latewood to latewood, the epoxy developed significantly stronger bonds than the resorcinol-formaldehyde. In turn, the resorcinolformaldehyde developed stronger bonds than the phenolic adhesive. In assemblies of earlywood-to-earlywood zones, all three adhesives developed excellent bonds.
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