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Title: What does Moisture-Related Durability of Wood Bonds Mean?

Source: In: Proceedings of the Final Conference on COSTE 34 Bonding of Timber. 2008 May 6-7; Sopron, Hungary. Sopron, Hungary: Lover-Print. 8 p.; 2008

Author(s)Frihart, Charles R.; Yelle, Daniel J.; Wiedenhoeft, Alex C.

Publication Year: 2008  View PDF »

Category: Conference Proceedings

Abstract:  The accelerated test methods that distinguish between acceptable and unacceptable wood adhesives generally involve subjecting the bonded assembly to abnormally rapid and extreme moisture exposure or cycling. In the United States and Canada, these tests for moisture durability have been established, but selection of the appropriate test methods for the different service classes (extent of water exposure) is still being discussed in some cases. For establishing these standards, a better understanding of the information provided by these tests about the bondline durability is important. Most studies involve different adhesives with the same wood species, and evaluate bond efficacy using strength and percent wood failure. We studied different wood species, especially in durability testing, to provide crucial insight into the factors that contribute to a durable bond and demonstrate the utility of the percent wood failure. The bonding and bond durability of white oak, sugar maple, aspen, Sitka spruce, southern yellow pine, and ipe are covered. The data indicate that the wood properties greatly influence the internal or interfacial stress and thus the durability of the bonded assembly.

Keywords: Wood swelling, bond durability, epoxy, ipe

File size: 217 kb(s)

Date posted: 03/29/2011
Current FPL Scientists associated with this product (listed alphabetically)
Frihart, Charles R.
Research Chemist
Wiedenhoeft, Alex C.
Research Botanist
Yelle, Daniel
Research Forest Products Technologist

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