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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