Ordered as TSP216, this is an AS568-216 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 1.109 in (28.17 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.387 in (35.23 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
PTFE (Teflon) is specified here for excellent dielectric properties and very wide continuous service temperature range. The compound resists nearly all industrial chemicals, solvents, and strong acids and bases. The material carries a published service range of -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 food and beverage, laboratory equipment, and aggressive-media pipelines.
TSP216 ships individually. Nominal inside diameter is listed as 1 1/8 inch. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description *2107-216 PTFE SPIRAL B/U FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 1.109 inch (28.17 mm)
Actual Outside Diameter 1.387 inch (35.23 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings