In each supply of X Lam panels, the delamination test is performed to check the strength of the glue joining the cross planks forming the panels.
The durability of the wood is virtually unlimited with the delamination test the strength of the glue that joins the components is checked in order to assisure that the glue is not the weak point but is stronger than the wood it joins.
Before testing, the glued wooden block is subjected to a cycle of water absorption and subsequent dehydration, an extreme situation corresponding to 30 years of the structure’s life.
To do this, the wood cube is immersed in an autoclave that brings the water pressure to 5 atmospheres (equivalent to 50 depth). Once the sample is extracted, it is dried in a dedicated oven.
After drying, the cube is returned to room temperature and broken by splitting it by applying a shearing stress.
Acceptance is predicts that the failure occurs on the part that is not glued i.e., that the glue is still stronger than the wood. This is a very important datum to ensure the strength of wooden structures in fact the glue must maintain the seal even in extreme coditions that do not occur in the life of the structure.
X Lam panels are made by gluing cross-laminated spruce boards; gluing is done with glues produced by companies operating in the international market. The glue companies have their own quality control system with random sampling to check the quality of the product.
Our supplier of X Lam panels, Artuso Legnami of Treviso, in this case, in turn checks the quality of the product before supplying the panels to our worksites.
