568-439 PTFE ORINGS FDA

APG stocks the TFE439, an AS568-439 white PTFE (Teflon) 55 Shore D O-Ring measuring an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

PTFE (Teflon) is widely chosen for a very wide continuous service temperature range and non-stick, non-contaminating surface characteristics. It resists oxidizing media, solvents, and steam. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or service requiring elastic recovery.

You will find this material specified across aggressive-media pipelines, food and beverage, and semiconductor fabrication.

Reference part number TFE439 when ordering; the item is sold individually. Nominal inside diameter is listed as 6 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.