The durability of isocyanate-based adhesives under service in Australian conditions. The results from a 3 year exposure study and accelerated testing regime (Literature Review)
This project focused on the performance of isocyanate-based adhesives (IBAs) used to bond Australian wood species in Australian conditions. IBAs are an alternative to phenolic-based adhesives used to produce engineered wood products (EWP). There were three main areas of investigation; a three year exposure test to monitor the durability of IBAs; five accelerated test methods; and the hygro-mechanical responses (i.e. response to changes in environmental conditions, particularly moisture) of thin films of adhesives. The wood species tested were Radiata Pine, Victorian Ash and Spotted Gum.
The project has found that determining a correlation between the three year exposure test results and the accelerated tests is difficult. Both the phenolic-based adhesive and the IBAs performed similarly in the exposure test, and there was no significant adhesive degradation associated with the Radiata Pine or Victorian Ash samples. A longer exposure period may be required for any trends to become more apparent.