When sourcing Duraplex plywood, you must prioritize the core material, typically hardwood, poplar, or birch, which determines structural integrity. Ensure the glue type used is WBP (Water Boiled Proof) Phenolic glue if the product is for outdoor or high-moisture use, as this allows the boards to withstand 72 hours of boiling without delamination. Additionally, verify the thickness tolerance (standard is usually ±0.5mm) and the number of plies to ensure the product meets your load-bearing requirements.