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PYROFOAM FM50R is permanent elastic perforated polyurethane foam with good sound absorption ability, excellent flame retardant performance, strong resilience and not easily deformed. It has small density, high flexibility, excellent sound absorption and damping performance. It can compatibly use with metal and non-metallic composite materials. It is easy to process, free to cut. PYROFOAM FM50R can be applied on rail transit with sound absorption, noise reduction and sealing.