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GLUE LINE RESISTANCE OF SOME COMMERCIAL ADHESIVES USED IN TROPICAL MEXICAN WOODS
There are several tropical Woods in México that could be potentially subject to sustainable management and commercialized based on their availability, aesthetic appearance, physical and mechanical properties, natural durability and workability. However, there is little information about the performance of these woods to commercial adhesives. Most of the wood manufactures are made using Polyinyl Acetate Adhesive (PVA), which is not water resistant but it is widely used for gluing products made of wood pine. The objective of this work was to evaluate the glue line resistance of eleven tropical Mexican woods, density 0.48 to 1.13 g/cm3. The commercial adhesives were Resistol 850™ and Elmer’s Carpentes’Glue™ (PVAc), both classified as category D1 according to DIN EN 204, Jowacoll 104.5™ (PVAc, category D3), Jowacoll104.5™ (PVAc+Catalizator Jowat 195.4™, category D4) and Jowat Power PUR™ (poliurethan, category D4). The glue line resistance was determined according to block-shear test (DIN 52 187), dry and wet conditions (cycles), according the German standard DIN EN 204. The results shown that there was similar response between adhesives category D1, when the glue line resistance was evaluated under dry conditions regardless either wood tested. The adhesives category D3 and D4 exhibited the best resistance. The adhesive category D3 satisfied only the minimum glue line resistance (4 N/mm²) after the treatment conditions specified for the sequence II (wet conditions), in contrast it exhibited a poor resistance for sequence III with all wood species. Finally, adhesives category D4 (exterior areas) resulted not appropriated for outside uses in most of the tested woods due to low glue line resistance (< 4 N/mm²).