news Polyurethane Rigid Foam Catalyst PC-5 in Roofing Insulation: Long-Term Performance and Reliability Polyurethane Rigid Foam Catalyst PC-5 in Roofing Insulation: Long-Term Performance and Reliability I... 03/2511Polyurethane Rigid Foam Catalyst PC-5 in Roofing Insulation: Long-Term Performance and Reliability