Ordered as TFE242, this is an AS568-242 white PTFE (Teflon) 55 Shore D O-Ring built to an inside diameter of 3.984 in (101.19 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.262 in (108.25 mm). The o-ring compresses into its gland to block fluid or gas migration across a joint.
The compound resists solvents, oxidizing media, and nearly all industrial chemicals. PTFE (Teflon) is widely chosen for excellent dielectric properties and one of the lowest coefficients of friction of any solid. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with molten alkali metals or elemental fluorine at temperature.
It sees regular use in aggressive-media pipelines, laboratory equipment, and pharmaceutical and biotech.
Order part number TFE242, sold individually. Nominal inside diameter is listed as 4 inch. Check the compound against your process media, pressure and temperature before committing to a design.
Description 568-242 PTFE ORINGS FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 3.984 inch (101.19 mm)
Actual Outside Diameter 4.262 inch (108.25 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Premium