Decorative Keystones

A decorative keystone is a trapezoidal polyurethane architectural element placed at the apex of arches, windows, or door frames to create a classic focal point. Unlike heavy stone or plaster alternatives, polyurethane keystones are extremely lightweight, eliminating installation risks and structural load. Highly resistant to impacts and moisture, they maintain their structural integrity outdoors without cracking, peeling, or blistering. Easily paintable and quick to install with adhesive, they save time and labor on-site. Polure offers high-density polyurethane decorative keystones featuring sharp geometric lines, rich pattern variety, and a smooth, premium finish.