Keystone Window Trim

Keystone window trim is an elegant architectural exterior element featuring a decorative keystone motif at the apex of window and door frames, historically symbolizing the distribution of vertical loads. Widely used on exterior windows and main entrance doors, it accentuates classical architectural styles while adding sophisticated aesthetic depth to building facades. Compared to traditional concrete, heavy stone, or fragile EPS foam moldings, polyurethane keystone trim offers superior impact resistance and an exceptionally hard outer surface. Its waterproof structure ensures it remains unaffected by rain, snow, and frost, preventing cracking, peeling, or surface degradation over time. Lightweight and easy to install, it places no extra load on the facade and is fully compatible with all exterior paints for years of maintenance-free beauty. Engineered with a high-density polyurethane formula, Polure's keystone window moldings deliver sharp lines, precise dimensions, and a flawless, smooth finish.