The TST135SO is an AS568-135 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 1.925 in (48.9 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.131 in (54.13 mm). This back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
As a material, PTFE (Teflon) is known for one of the lowest coefficients of friction of any solid and non-stick, non-contaminating surface characteristics. The compound resists oxidizing media, steam, and strong acids and bases. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). It is not the right choice where elemental fluorine at temperature or molten alkali metals are present.
Common environments for this compound include chemical processing, food and beverage, and laboratory equipment.
This item is sold individually under part number TST135SO. Nominal inside diameter is listed as 1 15/16 inch. Check the compound against your process media, pressure and temperature before committing to a design. 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 *135 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.925 inch (48.9 mm)
Actual Outside Diameter 2.131 inch (54.13 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings