G Metric Static Back-up Rings
The “G” series PTFE back-up ring series are proven components used for sealing both low and high pressure systems specifically for static applications. Any system pushing the pressure limits on an elastomer seal, “G” series back-up ring is an inexpensive option to increase seal pressure capabilities or increase radial extrusion gaps behind the seal.
The “G” series back-up ring series comes standard in T-LON® 01 (Virgin PTFE) but can be made from any filled T-LON® PTFE compound or plastic/metal to increase the pressure capabilities.
Consider a “G” series back-up ring with elastomer o-rings under the following conditions:
- Pressure above 1000psi (7MPa)
- Radial Extrusion gap > .005″ (.13mm)
- High Temperatures
- Medium with Contamination
- Pressure Shock Loads (Fast Pressure Changes)
Advantages:
- Inexpensive option with the solid “T3” option
- Easy to install with the cut “T2” option
- Increase pressure rating of standard o-rings
- Available for cylinders up to 1100mm diameter
Applications:
- Mobile Hydraulic Cylinders
- Pneumatic Piston Cylinders
- Agriculture Equipment
- Hydraulic Valves and Pumps
- Filling Machines
- Testing Machinery
- Any sealing application
Technical Data for PTFE compounds:
(1) Temperature Range: -240° to 260°C
(2) T-LON® seal compound determines allowable pressure
- Pressure: Up to 40 MPa
(Function of e-gap and T- LON® compound)
Most Common:
Virgin PTFE (“01”)
- Most cost effective
- Most flexible for fitting into tight areas
BRONZE FILLED PTFE (“21” or “22”)
- Highest Extrusion Resistance of PTFE Compounds (Higher bronze content increases extrusion/wear resistance; I.E. larger e-gap allowable)
- Low abrasion characteristics
Also Available for Extreme Pressures greater than 40MPa:
PEEK Compounds (“91” or “92”) Polyamide Compounds (“1N” or “6N”) ACETAL (“1D”)
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