VBU90021 is an AS568-021 black Viton® (FKM) 90 Shore A Back-Up Ring measuring an inside diameter of 0.926 in (23.52 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.066 in (27.08 mm). In service, this back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, Viton® (FKM) is known for long service life in hot, chemically aggressive environments and outstanding high-temperature capability. The material holds up against many acids, chlorinated solvents, and petroleum oils and fuels. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C). Verify compatibility before use with amines or hot water and steam.
It sees regular use in high-temperature process equipment, semiconductor equipment, and chemical processing.
Stocked as VBU90021 and sold individually. Unit weight is approximately 0.2711 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 8-021 BLACK FKM 90D BACK-UP RING
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 0.926 inch (23.52 mm)
Actual Outside Diameter 1.066 inch (27.08 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings