The following technical specifications apply to all of our stone veneer products: Modulus of Rupture: 434 PSI Compression Strength: 4561 PSI Absorption: 11.7% Durability: 30 cycles of free-thaw testing, no visual damage or weight loss detected from the samples. Fire Rating: Stone veneer has zero flame spread: zero fuel contributed and will not develop smoke. Installed Weight: 9 – 10 lbs. per sq. ft. Color Retention: only permanent iron oxides are used. No detectable color change can be observed even after years of weathering. Backed by a 50-year limited warranty. Heritage Stone will replace defective products brought to our attention prior to product installation. Once the veneer is placed on a wall or other surface, this constitutes acceptance of the product.