Teflon Sealing Ringis custom made of PTFE sheet ,including pure PTFE gasket,PTFE enveloping gasket and expanded PTFE sealing tap 1.PTFE ring is custom made of PTFE sheet ,including ... -resisting pipes for halogen,solvent,oil,gas,food and medication,sealing gasket for various equipments.3.Temperature:-100--260. Teflon Sealing Ring