Back-up Ring XSBUR09
Function:
Back-up rings do not have a sealing function. They are designed to prevent elastic sealing elements such as O-Rings or Quad Rings of gap extrusion.
Features:- Especially designed for use with O-Rings.
- Improved formstability of the elastomer O-Ring. Bigger contact area of the O-Ring compared to XSBUR08 creates in less deformation.
- Normally cut at an angle for easy installation, but also available as non-split version.
- Low dynamic friction.
- Low break-away forces after long standstills.
- Activated back-up rings reduce gap extrusion and prevent twisting of the seal in the groove.
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Seal housing recommandation
Tolerances | [mm]  |   |
---|
L < 10 mm
| + 0,2 | |
L ≥ 10 mm
| + 0,3 | |
∅ NA
| H8 | |
∅ NI
| h9 | |
|
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Surface roughness | Rtmax [ µ]  | Ra [ µ]  |
---|
Bottom of groove
| ≤ 6,3 | ≤ 1,6 |
Face of groove
| ≤ 15 | ≤ 3 |
|
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Sliding surface | Rtmax [ µ]  | Ra [ µ]  |
---|
PU, elastormeres
| ≤ 2,5 | ≤ 0,1 - 0,5 |
PTFE
| ≤ 2 | ≤ 0,05 - 0,3 |