Key:

Motion Used On Material Available
Linear Rotary Rods Pistons Shafts Buna-N Polyurethane Viton PTFE
U-Cups Excellent for low pressure sealing within cylinders
Excellent No Yes Yes No Yes Yes Yes No
O-Ring Supported U-Cups Withstands higher pressures than a standard U-Cup
Excellent No Yes Yes No No Yes No No
T-Seals Used within cylinders and have a compact design when space is limited
Excellent No Yes Yes No Yes No No No
Rod Wipers Used to prevents contaminants from entering cylinders
Excellent No Yes No No Yes Yes Yes No
V-Packings These packing rings can be stacked for additional sealing power
Excellent Excellent Yes Yes Yes Yes No No Yes
Spring Supported Seals (Energized) Chemically resistant PTFE is supported by a metal spring for additional sealing force
Excellent Excellent Yes Yes Yes No No No Yes
Shaft Seals Commonly called oil seals and used in rotary applications
No Excellent No No Yes Yes No No No
Metal Encased Shaft Seals A metal shell makes these more durable than standard shaft seals, but less compressible
No Excellent No No Yes Yes No No No