STAUF PUM-950 Power-Mastic is a urethane-based, high-strength adhesive for professional wood flooring installation. Unlike other urethane adhesive products, it contains no isocyanates which can etch fine floor finishes. With a high shear strength and zero flash time required, PUM-950 grabs, holds, and keeps wood floors in place without delay. It has earned the highest GEV-EMICODE EC 1 ranking from the European Association for Control of Emissions for Flooring.