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Marine-grade plywood is a sturdier, higher-quality material made of Western Larch or Douglas-fir that is not treated with chemicals. This type of wood's thin sheets of veneer (plies) is usually set up perpendicularly as part of a process called cross-lamination that helps strengthen the material.
Conforms to BS1088-2003 and certified to EN636-3S (6mm certified to EN636-3G)
Manufactured with high-quality face and core biologically durable hardwoodsthroughout
Exterior phenolic resin glue to give long life in humid and wet conditions
Suitable for marine use, but not for immersion in water
EN636 - 3 (Class 3) Defines that the product is made from timber that is durable (hardwood throughout) and is suitable for all exterior application including frequent wetting. Prolonged use in an external application would require boards to be covered or decorated.
The final part of EN636 deals with its suitability for structural use. All the plywood we stock of a thickness 9mm or over is suitable for structural use and is defined by the addition of the letter "S". Boards below 9mm show the letter "G" in their description and are only suitable for General use (non-structural)