Bonding strength of local commercial wood adhesives - I
Bonding strength of local commercial wood adhesives - I
S. M. Yasin, T. A. Qureshi and S. M. Raza
ABSTRACT
Bonding strength of several commercial adhesives was
determined through the shear strength of wood joints of
Walnut (Juglans regia), Eucalytus camaldulensis and
Juniper (Juniperus excelse) wood species. The durability
of these adhesives was also estimated after conditioning
the wood joints to 65%, 80% and 95% RH at 35°C. In
addition the optimum pressing time for each adhesive was
determined. Taking shear strength of walnut wood as a
standard for comparison of bonding strength it was
observed that different commercial adhesives exhibited
highly variable bonding and durability qualities. Rubber
based adhesives exhibited very poor bond strength
whereas, polyvinyl acetate adhesives provided acceptable
bond strength. All adhesives showed loss of strength
with an increase in humidity. The gluibility of woods
also varied in different species tested in this study.
In general, for developing strength the adhesives took
lesser time than that prescribed by the manufacturers.
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December 1988
Vol. 38, Iss. 4
