Back-up ring Prädifa series XA, Polon® | Product Series

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Outside Diameter (mm)

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Maximum Working Temperature (°C)

Seal Material

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Back-up ring Prädifa series XA, Polon® Back-up ring Prädifa series XA, Polon®

Back-up ring Prädifa series XA, Polon®

Plain PTFE back-up ring to prevent extrusion.

Technical Specifications

  • Media: Hydraulic
  • Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Polyether Ether Ketone (PEEK)
  • Maximum Operating Pressure: 200 bar, 400 bar, 800 bar
  • Minimum Operating Temperature: -200 to -30 °C
  • Maximum Operating Temperature: 80 to 230 °C
  • Maximum Surface Speed: 0 m/sec, 0.5 m/sec, 1.0 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)
Safety Warning

Full Product Description

The XA Polon® anti-extrusion ring (single turn continuous version) is used in combination with O-rings, preferably in static applications, to prevent gap extrusion. XA anti-extrusion rings are suitable for maximum pressure loads. They are intended for installation in axially open grooves.

Polon® anti-extrusion rings are available in three versions:
XA: Single turn continuous
XB: Single turn scarf cut
XC: Spiral cut

• Insensitive to pressure peaks.
• High extrusion resistance.
• Excellent media resistance in case of suitable compound selection.
• Suitable compounds available for special requirements of the chemical process industry.
• Suitable compounds available for special requirements of the food processing industry.
• Any desired nominal diameter available due to use of machining technique.
• 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

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Products Inside Diameter (mm) Outside Diameter (mm) Element Height (mm) Groove Depth (mm) Minimum Working Temperature (°C) Maximum Working Temperature (°C) Seal Material
XA12000120901XF 115.2 120 1.5 2.4 -190 230 12
XA09000830901XI 81.7 90 2 4.15 -30 100 83
XA10032160901XJ 91.5 100.3 2 4.4 -190 230 216
XA02300010901XA 20.4 23 1 1.3 -190 230 1
XA02830010901XA 25.7 28.3 1 1.3 -190 230 1
XA03300010901XA 30.4 33 1 1.3 -190 230 1
XA03800010901XA 35.4 38 1 1.3 -190 230 1
XA03900010901XA 36.4 39 1 1.3 -190 230 1
XA04450010901XA 41.9 44.5 1 1.3 -190 230 1
XA05250010901XA 49.9 52.5 1 1.3 -190 230 1
XA05950010901XA 56.9 59.5 1 1.3 -190 230 1
XA06400010901XA 61.4 64 1 1.3 -190 230 1
XA01300010901XB 10 13 1 1.5 -190 230 1
XA02030010901XE 16.2 20.3 1.5 2.05 -190 230 1
XA03500010901XE 30.9 35 1.5 2.05 -190 230 1
XA04000010901XE 35.9 40 1.5 2.05 -190 230 1
XA04360010901XE 39.5 43.6 1.5 2.05 -190 230 1
XA05360010901XE 49.5 53.6 1.5 2.05 -190 230 1
XA06000010901XE 55.9 60 1.5 2.05 -190 230 1
XA05300010901XF 48.2 53 1.5 2.4 -190 230 1
XA05800010901XF 53.2 58 1.5 2.4 -190 230 1
XA06900010901XF 64.2 69 1.5 2.4 -190 230 1
XA01270010901YN 9.8 12.7 1.4 1.45 -190 230 1
XA00700420901YN 4.1 7 1.4 1.45 -190 230 42
XA19000250901YX 180.6 190 1.7 4.7 -190 230 25
XA22000250901YX 210.6 220 1.7 4.7 -190 230 25
XA05750300901XV 51.3 57.5 1.4 3.1 -190 230 30
XA40000010901XX 391.4 400 1.7 4.3 -190 230 1
XA41000010901XX 401.4 410 1.7 4.3 -190 230 1
XA03000420901YF 24.9 30 1.5 2.55 -190 230 42
XA09400010901YG 87.8 94 1.5 3.1 -190 230 1
XA08120250901YG 75 81.2 1.5 3.1 -190 230 25
XA12600010901XW 118 126 1.7 4 -190 230 1
XA07900010901XF 74.2 79 1.5 2.4 -190 230 1
XA11800310901XJ 109 118 3.2
XA06800740901XG 62.3 68 1.5 2.85 -190 230 PS074
XA08100010901XF 76.2 81 1.5 2.4 -190 230 PS001
XA48150110901ZK 470.9 481.5 2.0 5.3 -190 230 PS011

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