As a new blowing agent for rigid polyurethane foam, cyclopentane is used to replace the chlorofluorocarbon (CFCS) that has a destructive effect on the atmospheric ozone layer. It is now widely used in the production of fluorine-free refrigerators, freezers, cold storage, pipeline insulation and other fields . As the deadline for the ban on ODS stipulated by Montreal and other conventions approaches, CFCs and HCFCs products will soon be banned, and cyclopentane will surely become the protagonist in the field of polyurethane foaming agents.