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    Description

    An important aspect of any adhesive bond is that the bond maintains its integrity during its end use. Epoxies form highly durable bonds with many substrates but are usually not considered capable of forming completely durable bonds with wood by standard accelerated tests. However, epoxies are sold for wood boat construction, and some data have indicated that epoxies can have sufficient exterior durability for general use in wood products. This conflicting information raises an important question. Are the reported discrepancies caused by changes in epoxy–wood bond formulations or in the use of different durability test methods? Examination of these data has led to an interfacial strain model which provides the most compelling explanation for the durability observations of epoxy–wood bonds. The results of bond failure analysis, coupled with the ability of epoxies to bond acetylated wood and give bond durability to wood primed with hydroxymethylated resorcinol or melamine-based primers add support to this model in explaining epoxy–wood bond durability results.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Frihart, Charles R. 2005. Are epoxy-wood bonds durable enough?. Wood adhesives 2005 : November 2-4, 2005 ... San Diego, California, USA. Madison, WI : Forest Products Society, 2005: ISBN: 1892529459: pages 241-246.

    Keywords

    Epoxy resins, adhesives, testing, resorcinol, adhesion, failures in wood, bonding, durability, melamine resins, resorcinol glues, bondline, bond strength, strength, melamine

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https://www.fs.usda.gov/treesearch/pubs/27043