Traditional plywood uses Urea Formaldehyde glue and Phenol glue. The danger in using this product indoors is the emission of formaldehyde and poisonous phenyl, which affects the central nervous system. Dasso addressed this concern early and instead imports high quality European glue. The high strength of adhesion of this refined glue meets U.S. testing standards for 3-ply laminated flooring ANSI-3 cycle-Test for flooring. Emissions meet the E1 standard.This is the reason why our products lead in the industry and are accepted and promoted in European, U.S. and Japanese flooring markets.