Piston seal Prädifa series MK, Ultrathan® | Product Series

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Inside Diameter (mm)

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Minimum Working Temperature (C)

Maximum Working Temperature (C)

Seal Material

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Piston seal Prädifa series MK, Ultrathan® Piston seal Prädifa series MK, Ultrathan®

Piston seal Prädifa series MK, Ultrathan®

Where to Buy

Piston seal for pneumatic cylinders, single-acting. U-cup design with integrated guiding function and cushioning buffers.

Technical Specifications

  • Thermal Application Type: Low Temperature (< -35°C), Standard Moderate Temperature (-35 to 100°C)
  • Media: Pneumatic
  • Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)
  • Maximum Operating Pressure: 12 bar
  • Minimum Operating Temperature: -45 to -30 °C
  • Maximum Operating Temperature: 80 to 95 °C
  • Maximum Surface Speed: 1 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: Yes
  • Pressure Rating: Pneumatic Pressure (< 16 bar)
Safety Warning

Full Product Description

The MK piston seal made of wear-resistant Ultrathan® is a sealing element with an integrated guiding surface and cushioning buffers. This seal-guide element can be used both on pistons with or without a permanent magnet. When used in magnetic pistons, the seal-guide element encapsulates the permanent magnet. The front-end cushioning buffers serve to absorb shocks. For double-acting cylinder designs, the MK seal profile may also be used in a back-to-back arrangement.

• The asymmetrical retention groove ensures optimum positive connection between the sealing element and the piston.
• Cushioning buffers on the piston´s front faces with integrated ventilation ducts provide for mechanical cushioning of the cylinders.
• Multi-functional sealing element. The guiding area at the sealing element performs the guiding function in the cylinder. However, due to its geometry the sealing element is not suitable for absorption of high radial forces or long strokes.
• Multi-functional element: seal, guiding and cushioning element.
• Optimal front-side sealing effect due to favourable cushioning buffer geometry.
• Prevents metallic contact between the piston and cylinder. Ideal for light-metal and plastic cylinders (ridging).
• Long service life thanks to application-optimized compounds.
• Easier installation.
• Assembly on one-part piston is possible.
• Excellent media resistance in case of suitable compound selection.
• Low compression set.

Range of application:
For use in pneumatic cylinders.

Related Documents

Literature and Reference Materials
Pneumatic Seals--PTD3351
Compound Data Sheet TPU P5010
Installation Guidelines for Piston Seals--PTD3351
Storage and Cleaning of Elastomer Seals--PTD3032
Ultrathan®--Piston seal / guiding element MK--PTD3351
Product Demos & Tutorials
How to Properly Store and Clean Elastomer Seals
Mixing the right ingredients: Material Development at Parker-Prädifa
Parker Final Exam in Physics / Sealing Systems Put to the Test
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Products Outside Diameter (mm) Inside Diameter (mm) Element Height (mm) Groove Width Minimum Working Temperature (C) Maximum Working Temperature (C) Seal Material
MK1206P5010 12 6 5.9 5.9 -30 80 P5010
MK1608P5010 16 8 5.9 5.9 -30 80 P5010
MK2010P5010 20 10 5.9 5.9 -30 80 P5010
MK2510P5010 25 10 6.15 6.150 -30 80 P5010
MK3225P5010 32 25 7.15 7.15 -30 80 P5010
MK4033P5010 40 33 7.65 7.650 -30 80 P5010
MK5043P5010 50 43 7.65 7.650 -30 80 P5010
MK6353P5010 63 53 9.9 9.9 -30 80 P5010
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