Greenply 18 mm Thick Exterior Grade Plain MDF Board. Crafted for outdoor applications where strength and resilience are paramount, this board stands up to the harshest elements. Its substantial 18 mm thickness offers a sturdy foundation for outdoor furniture, building facades, signage, and more. With Greenply's Exterior Grade MDF Board, you're investing in a product that ensures your creations remain robust and visually appealing, even when exposed to the toughest environmental conditions.