Anti-Extrusion Ring Prädifa series X1 for Aircraft, Polon® | #X11927PS001


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X11927PS001 X11927PS001

Anti-Extrusion Ring Prädifa series X1 for Aircraft, Polon® | #X11927PS001

Plain PTFE back-up ring according to AS8791 to prevent extrusion.


Technical Specifications

  • Outside Diameter (mm): 21.78
  • Industry Standards: M8791/1-018
  • Inside Diameter (mm): 19.08
  • Material - Seals: 1
  • Minimum Working Temperature (°C): -200
  • Element Height (mm): 1.27
  • Maximum Working Temperature (°C): 260
  • Media: Hydraulic
  • Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®)
  • Maximum Operating Pressure: 200 bar
  • Minimum Operating Temperature: -200 °C
  • Maximum Operating Temperature: 260 °C
  • Maximum Surface Speed: 0 m/sec
  • Cushioning Mechanism: No
  • Thermal Application Type: Expanded Low and High Temperature (< -35 to 140°C)
  • Pressure Rating: Medium Pressure (< 250 bar)
  • Specifications Met: AS 8791, M8791/1-018
Safety Warning

Item Information

Anti-extrusion rings (back-up rings) are used for static and dynamic applications in connection with O-rings, to prevent extrusion of the O-ring into the diametral clearance. The sizes of X1 anti-extrusion rings conform to AS8791 which
specifies the dimensional and material engineering requirements for PTFE back-up rings used in aerospace applications. The standard material is Polon® 001 (virgin PTFE).

• Insensitive to pressure peaks.
• High extrusion resistance.
• Excellent media resistance in case of suitable compound selection.
• Any desired nominal diameter available due to manufacturing technology.
• Installation in closed and undercut housings.

We recommend to specify back-up rings when at least one of the following working conditions is present in cases where the intention is to seal with O-rings only:
• Pressure above 70 bar.
• Diametral clearance exceeding 0.25 mm at p > 10 bar.
• High stroke frequency.
• High temperatures.
• Contaminated medium.
• Strong pressure pulsing or pressure changes.

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South Africa Headoffice

Parker Hannifin (Africa) Pty LTD

Sales Company South Africa

10 Berne Avenue

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Kempton Park

Gauteng

South Africa

1620

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0027 11 961 0700

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