Flame Retardant Wood Plywood Lumber Timber & Timbers Flame retardant wood, lumber, plywood, timber and timbers are vacumm pressure impregnated with Flame Safe fire retardant to comply with the ASTM E84 standard and shall have a flame spread of 25 or less. Accredited independent third party testing Flameretardantwood.com~Site InfoWhoisTrace RouteRBL Check