This back-up ring is supplied in AS568-166 white PTFE (Teflon) 55 Shore D built to an inside diameter of 6.737 in (171.12 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 6.943 in (176.35 mm), catalogued under part number TST166. It extends o-ring service life by supporting the seal against extrusion under high pressure.
It resists solvents, oxidizing media, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) delivers one of the lowest coefficients of friction of any solid and non-stick, non-contaminating surface characteristics. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C).
Typical settings include food and beverage, aggressive-media pipelines, and laboratory equipment.
Order part number TST166, sold individually. Nominal inside diameter is listed as 6 3/4 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 2103-166 PTFE S/T BUP FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 6.737 inch (171.12 mm)
Actual Outside Diameter 6.943 inch (176.35 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings