434 PTFE SOLID BACKUP RING FDA

This back-up ring is supplied in AS568-434 white PTFE (Teflon) 55 Shore D measuring an inside diameter of 5.6 in (142.24 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.15 in (156.21 mm), catalogued under part number TST434SO. It extends o-ring service life by supporting the seal against extrusion under high pressure.

Expect good resistance to strong acids and bases, oxidizing media, and nearly all industrial chemicals. That behavior comes from the compound itself: PTFE (Teflon) is valued for excellent dielectric properties and one of the lowest coefficients of friction of any solid. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C).

It sees regular use in food and beverage, laboratory equipment, and semiconductor fabrication.

Reference part number TST434SO when ordering; the item is sold individually. Nominal inside diameter is listed as 5 5/8 inch. Check the compound against your process media, pressure and temperature before committing to a design.