568-338 FEP ENCAPSULATED SILICONE

APG stocks the TES70338, an AS568-338 red PTFE-Encapsulated Silicone 70 Shore A O-Ring with an inside diameter of 3.1 in (78.74 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.52 in (89.41 mm). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. This item is further identified as ORING 70 Durometer.

PTFE-Encapsulated Silicone is specified here for strong resistance to permeation and chemical inertness of PTFE with the wide temperature range of silicone. Expect good resistance to strong acids and solvents, nearly all process chemicals, and steam. Rated temperature range runs from -75°F (-59.4°C) to 400°F (204.4°C) in continuous service. It should not be specified for service in tight-radius dynamic flexing or installation over sharp edges.

Common environments for this compound include pharmaceutical manufacturing, cryogenic and high-temperature equipment, and chemical processing.

Reference part number TES70338 when ordering; the item is sold individually. Nominal inside diameter is listed as 3 1/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.