*568-257 FEP ENCAPSULATED SILICONE

Ordered as TES70257, this is an AS568-257 red PTFE-Encapsulated Silicone 70 Shore A O-Ring measuring an inside diameter of 5.859 in (148.82 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.137 in (155.88 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies. This item is further identified as ORING 70 Durometer.

Expect good resistance to steam, strong acids and solvents, and nearly all process chemicals. That behavior comes from the compound itself: PTFE-Encapsulated Silicone is widely chosen for a seamless PTFE jacket over a resilient silicone core and chemical inertness of PTFE with the wide temperature range of silicone. Continuous operating temperature is published at -75°F (-59.4°C) to 400°F (204.4°C). Exposure to installation over sharp edges or tight-radius dynamic flexing will shorten service life.

You will find this material specified across cryogenic and high-temperature equipment, pharmaceutical manufacturing, and chemical processing.

TES70257 ships individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.