Archidply Fire Retardant Plywood meets IS 5509-2000 standards offering resistance to ignition, surface spread of flames and flames penetration by suitable chemical treatment. Fire retardant characteristics are a very important property to prevent propagation of fire at the initial stages. Flame penetration: The time taken for flame penetration shall not be less then 15 minutes for every 6mm thickness. Rate of burning: The time taken to lose weight from 30 percent shall not be less then 20 minutes. Flammability: The time taken for second ignition shall not be less then 30 minutes.