Window scantlings and door frames may be exposed to extreme weather conditions. They are largely bonded with PVAC adhesives which meet the requirements for durability class D4 according to EN 204. They are formaldehyde free, user and environmentally-friendly products. They can be used in cold, hot and HF presses.
Two-component emulsion polymer isocyanate (EPI) adhesives also meet the requirements for durability class D4 and are specially recommended for bonds with direct exposure to weathering and bonding of modified wood.