RR501 | 5lb Stabilizing Foam Get some stability in your life with HMI’s RR501 Poly Foam. Our RR501, a 5 lb. per cubic foot density foam, provides a slower reaction time and further spread. Due to the distance this foam can travel, RR501 is excellent for undersealing and stabilizing joints on rocking slabs from slab curl. RR501 polyurethane foam is formulated for stabilization, not lifting; therefore, RR501 does not have a high expansive force. » Request a technical data sheet for RR501 » Read the RR501 Joint Stabilization case study Learn more about HMI’s RR501 Stabilizing Joint Foam Get more info now