This back-up ring is supplied in AS568-336 white PTFE (Teflon) 55 Shore D built to an inside diameter of 2.85 in (72.39 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.27 in (83.06 mm), catalogued under part number TST336SO. It bridges the extrusion gap so the primary seal holds its shape under load.
PTFE (Teflon) is widely chosen for excellent dielectric properties and non-stick, non-contaminating surface characteristics. It resists oxidizing media, strong acids and bases, and nearly all industrial chemicals. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Verify compatibility before use with elemental fluorine at temperature or molten alkali metals.
It sees regular use in food and beverage, aggressive-media pipelines, and pharmaceutical and biotech.
TST336SO ships individually. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Description 336 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 2.85 inch (72.39 mm)
Actual Outside Diameter 3.27 inch (83.06 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings