Fluoroplastic offers exceptional resistance to almost all chemicals within the temperature range of the expansion joint body construction. 

The lining is fabricated as an integral part of the expansion joint during manufacture, covers all wetted surfaces in the tube and sleeve area and is firmly connected to the exterior rubber bellow. A detailed specification of the operating conditions is required when considering employing a PTFE/FEP-lined rubber expansion joint. Generally movement capability of some expansion joint types with fluoroplastic liner is limited to 60 to 70 % of the normal movements of comparable size expansion joints without lining.