Chesterton 184 is 100% virgin PTFE with micro-fibrillated internal structure for excellent stability. The micro-fibrillated structure turns ordinary PTFE into a dimensionally strong, creep resistant gasketing material. 184 provides a long lasting, high reliability seal with minimum re-torque requirements. 184 is soft and pliable to conform to worn or uneven services and effects a tight seal. Cut your gaskets from a 184 sheet using just a pair of scissors or knife.