Anti-Extrusion Ring Prädifa series X1 for Aircraft, Polon® | Product Series

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Outside Diameter (mm)

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Material - Seals

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

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

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

Technical Specifications

  • 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
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Thermal Application Type: Expanded Low and High Temperature (< -35 to 140°C)
  • Pressure Rating: Medium Pressure (< 250 bar)
  • Specifications Met: M8791/1-004 to M8791/1-437
Safety Warning

Full Product Description

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.

Related Documents

Literature and Reference Materials
X1 Anti-Extrusion Rings for Aircraft--PDE3025
Product Demos & Tutorials
Mixing the right ingredients: Material Development at Parker-Prädifa
Parker Final Exam in Physics / Sealing Systems Put to the Test
Communities, Blogs & Industry Links
Industry Aerospace
O-Rings Knowledge Base
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Products Inside Diameter (mm) Outside Diameter (mm) Element Height (mm) Minimum Working Temperature (°C) Maximum Working Temperature (°C) Material - Seals Industry Standards
X11127PS001 11.13 13.83 1.27 -200 260 1 M8791/1-013
X11927PS001 19.08 21.78 1.27 -200 260 1 M8791/1-018
X12327PS001 23.95 26.65 1.27 -200 260 1 M8791/1-021
X12727PS001 27.13 29.83 1.27 -200 260 1 M8791/1-023
X12737PS001 27.05 31.42 1.37 -200 260 1 M8791/1-121
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