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Back-up rings provide added extrusion resistance and prevent damage to O-rings and seals when subjected to high pressures, larger extrusion gaps, and/or high temperatures. The use of back-up rings can significantly increase the pressure rating of almost any seal. They are used in conjunction with O-rings or dynamic seals for both static and dynamic sealing applications. The cross section of a back-up ring is generally rectangular, and they are not designed for sealing purposes.
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| Product properties | |
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| Brand | Dichto |
| Category | Back-ups |
| Inside Diameter (mm) | 69.57 |
| EAN Number | 8-039 |
| Material | Nitrile Rubber |
| Series | Imperial |
| Shore Hardness (A) | 90 |
| Temp Range (°C) | -30 to 100 |
| Colour | Black |
| Cross Section (mm) | 1.78 |
| Appropriate O-Ring | R 2275 |
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