VBU90123 is an AS568-123 black Viton® (FKM) 90 Shore A Back-Up Ring with an inside diameter of 1.174 in (29.82 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.38 in (35.05 mm). In service, this back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
Viton® (FKM) is specified here for excellent resistance to compression set and permeation, industry benchmark where nitrile reaches its thermal limit. It resists engine and transmission fluids, aggressive chemicals, and many acids. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C).
It sees regular use in oil and gas, high-temperature process equipment, and semiconductor equipment.
Order part number VBU90123, sold individually. Unit weight is approximately 0.9058 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description 8-123 BLACK FKM 90D BACK-UP RING
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.174 inch (29.82 mm)
Actual Outside Diameter 1.38 inch (35.05 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings