Expanded PTFE gaskets and pure PTFE gaskets are two types of gaskets with different structures and properties.
Pure PTFE gasket, also known as Teflon gasket, is made of polytetrafluoroethylene and possesses excellent properties such as corrosion resistance, aging resistance, and non-conductivity. PTFE has a PH range of 0-14 It can maintain good mechanical strength between -180°C to 250°C and withstand pressures of up to 5 MPa. Pure PTFE gaskets are clean sealing gaskets that won’t contaminate any sealing surface and can be widely used in the food and medicine industries.
An expanded PTFE gasket is made of a special process that expands PTFE material into a porous and flexible structure. It has excellent properties such as resistance to creep, cold flow, ultra-low temperatures, and self-lubrication.
Compared with pure PTFE gaskets, the advantages of expanded PTFE gaskets include:
1, Excellent creep resistance and cold flow resistance, maintaining stable bolt tightening force during the sealing process.
2, Superior sealing performance, adapting to irregular flange surfaces and compensating for flange deformation.
3, Good flexibility, compression resilience, high and low-temperature resistance, aging resistance, and self-lubrication.
4, Easy to install, can be cut by hand or machine.
5, Longer service life of flanges due to their unique adaptability and molding ability.
It has wide applications: suitable for strong corrosive environments, and effectively controls leaks at pipeline joints, typically used for steel flanges, plastic flanges, enamel glass flanges, and PTFE or rubber-lined flanges with damaged or non-parallel flanges.
