The new directive has been put in place to fill a normative gap in the wood adhesive sector for exterior use, in which for the same application that undergoes to specific environmental defined conditions, different adhesive technologies are deployed ranging from thermoplastic non-load bearing adhesives to thermosetting ones.
The new standard provides three durability classes:
XT5: exterior application with rare exposure to direct weathering, in which the glued wooden product is covered by constructive protection from the weather. (e.g.: wooden products behind cladding and products completely protected by roofs, coverings, canopy, or open sheds);
XT6: exterior application with occasional but not persistent exposure to direct weathering, in which the glued wooden product is partially covered by constructive protection;
Then, the XT class performance of the adhesive shall be carried out with a tensile shear test after two different conditioning sequences, distinctly performed:
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