177 PTFE SOLID BACKUP RING FDA

This back-up ring is supplied in AS568-177 white PTFE (Teflon) 55 Shore D supplied with an inside diameter of 9.487 in (240.97 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.693 in (246.2 mm), catalogued under part number TST177SO. It extends o-ring service life by supporting the seal against extrusion under high pressure.

This material stands up to solvents, steam, and nearly all industrial chemicals. That behavior comes from the compound itself: PTFE (Teflon) is widely chosen for one of the lowest coefficients of friction of any solid and excellent dielectric properties. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Applications involving elemental fluorine at temperature or service requiring elastic recovery call for a different compound.

You will find this material specified across semiconductor fabrication, aggressive-media pipelines, and food and beverage.

TST177SO ships individually. Nominal inside diameter is listed as 9 1/2 inch. 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.