APG stocks the TST324, an AS568-324 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 1.35 in (34.29 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.77 in (44.96 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
PTFE (Teflon) is known for one of the lowest coefficients of friction of any solid and excellent dielectric properties. The material holds up against steam, solvents, and strong acids and bases. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C).
It sees regular use in semiconductor fabrication, laboratory equipment, and aggressive-media pipelines.
This item is sold individually under part number TST324. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 2103-324 PTFE S/T BUP FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 1.35 inch (34.29 mm)
Actual Outside Diameter 1.77 inch (44.96 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings