40MP-GRE800 Dixon Valve 8" Sanitary PTFE Envelope Clamp Gasket with EPDM FillerFeatures: Color Code: Not usually marked Peroxide cured FKM. Meets 21CFR 177. 1550 PTFE passed USP Class VI Cytotoxicity testing. Note: PTFE is a material subject to plastic flow. When cycled through heat and then cooled down in process lines, PTFE gaskets will not return to the original configuration and it will continue to compress as the cycling continues. This plastic flow will allow leakage if clamp torques are not maintained. Part Number Size