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120 (complete ring)
Complete back-up ring. This is the best performing back-up ring, which provides the best support for the O-ring, with the drawback being more complicated installation.
Advantages:
- Optimal performance, at the cost of more complicated installation, because the ring is uncut
- Allows use of O-rings in certain high-demand applications
Limitations:
- Depends on the material, usually -200°C to 200°C