Elastochem closed-cell spray applied polyurethane foam is a two component, medium-density, structural insulation system designed for commercial, residential, and industrial applications. Closed-cell polyurethane foam yields a high R-value and minimizes air and moisture infiltration. The spray applied nature of PROSEAL systems allows for tremendous sealing properties which contributes to healthier homes and workplaces. The rigid nature of PROSEAL increases overall structural integrity resulting in more durable structures. PROSEAL expands during application to provide increased performance values by sealing the building envelope. The PROSEAL system is comprised of an “A” component or aromatic diisocyanato and a blended “B” component which includes polyols, fire retarding materials, catalysts and non-ozone depleting blowing agents