Relationship of Adhesive Softening Temperature to Exposure Tests for Bond Durability

Thermal softening temperatures for nine adhesives were determined and related to the durability of these adhesives in wood laminates. The wood-glue bond exposure tests involved up to 6 years of outdoor test-fence weathering, up to 1,600 cycles of a multiple- exposure, accelerated-aging test, and 3 days’ soaking in water. The softening temperature test for adhesives was found to be a useful laboratory procedure for preliminary ranking of adhesive durability.

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