BACKUP VITON INCH

DESCRIPTION

Our 8-N backup rings help prevent extrusion in high pressure service and compensate for loose fitting parts. These backup rings have a contour design and are manufactured from 90-duromenter nitrile. The 8-N backups will stretch up to 50% and are quickly and easily installed. 

Our 8-N contoured backup rings are generally usable through a temperature range of -40 to 250. Hardening of this material due to high or low temperatures often improves performance as a back-up ring. 

In double-acting seal assemblies, an 8-N backup is required on both sides of the o-ring. It is cheap insurance to use two even in single acting installations. At assembly, it is too easy to place a single 8-N backup on the wrong side of the o-ring. By specifying one on each side of the o-ring, there be one on the low pressure side, where it is needed, and the extra 8-N backup does no harm. 

This style is also available in Fluorocarbon for use in a wide range of chemical media and high temperature resistance up to 400F. For Fluorocarbon, replace the -N with -V at the end of the part number. 

SEAL INFORMATION

Material Type: FLUOROCARBON 

Durometer (Shore A) NITRILE: 90 

Durometer (Shore A) FLUOROCARBON: 90 

Temperature Range (F) NITRILE: -40 TO 250 

Temperature Range (F) FLUOROCARBON: -20 TO 400 

Extrusion Gap at Various Pressures (in):

• 2,000 PSI: 0.010
• 4,000 PSI: 0.005
• 6,000 PSI: 0.003
• 8,000 PSI: 0.002
• 10,000 PSI: 0.000 (METAL-TO-METAL CONTACT REQUIRED)

Max Speed (ft/sec): 3.0 

Mating Surface Roughness - Ra (µin) - DYNAMIC: 4<>16 

Mating Surface Roughness - Ra (µin) - STATIC: 63 MAX 

Part Number Definition (Inch): 8-(AS568 3-DIGIT NUMBER)N (OR V FOR FLUOROCARBON) 

Additional Part Number Definition (Inch): 2"ID X 1/8" NOMINAL CS = 8-226N (OR 8-226V)