XL Joinery Tricoya Westminster Double Glazed External Door. Acetylation changes elements within the wood, reducing the ability to absorb water and adding stability and durability. A high-tech solution, but one with outstanding performance benefits. Constructed with durable and dimensionally stable Tricoya external door outer faces ensures these hard-wearing and weather-resistant external doors can withstand all weathers. Primed ready for on-site finishing. Can be cut up to 12mm from each edge. EUTR Compliant.