Plywood is the wood-based panel product that shows the best physical and mechanical properties for application in constructions, even more valid under moist circumstances and with load-bearing applications under exterior conditions. The mechanical and physical criteria to be met for construction purposes in general, and more specifically for outdoor applications, are well defined. However, the required biological durability is not very clear. Suitable laboratory fungal test methods have been developed giving reproducible results in line with testing of the biological durability of solid wood, as well as test methods used for the efficacy determination of wood preservatives. The standard test method, according to ENV 12038, needs to be validated as a method to predict actual suitability of plywood products in applications under hazard class 3 conditions according to EN 335.
The main objective is to develop a fit-for-purpose tool to determine the expected service life of plywood produced for a specific application. Such a quality evaluation system will bring the biodegradable plywood up to a level of full comparability with alternative products and provide the end user with clearer decision tools. The increased service life should also be reflected by the laboratory fungal test, or at least be based on an alteration in the relationship between performance under laboratory testing and reality performance. Both the input from plywood performance in existing constructions, as well as the field testing of boards, will provide details on the relationship between laboratory durability testing of plywood and the service life of the products in practice. The use of coated plywood, both for covered and non-covered exterior conditions enhances the plywood's performance.
Progress to Date
The project started at the beginning of 2003 and the first efforts were related to the materials and method topics of the project. Suitable plywood for common testing was discussed and selected by the different companies participating. The laboratories are in the process of defining and fine-tuning their methodology to test the material (exterior plywood) in the different tasks. A comparison of test results from earlier work and the test methods used for both lab testing and simulated field trials were the basis of a focused test set up by the partners in the project.
Suitable plywood for common testing has been identified. The test methodology, as indicated in the technical annex, was fine-tuned for each of the laboratories participating.
FORESTRY, NON-FOOD PRODUCTS
Scientist responsible for the project
Dr JORIS VAN ACKER
Coupure links 653
Belgium - BE
Phone: +32 9 264 6120
Fax: +32 9 264 6233
||Universiteit Gent (Ghent University)
||01 January 2003
||1 789 070 €
|Total EC contribution
||1 355 383 €
|Web address of the project
- PANGUANETA DI TENCA ANTONIO E EREDI DI AZZI PALMIRO S.N.C., Italy - IT