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Arlon® 4020 Labyrinth Seal

Custom Engineering Delivers Maximum Performance and Efficiency

Flexible thermoplastic tooth design minimize clearances

Non-contacting labyrinth seals deliver leakage reduction in centrifugal applications, restricting flow through a sequence of chambers formed between the rotating element and the teeth to control the passage of media. Traditional metallic labyrinth seals require large clearances to avoid potential heat generation, deformation and galling that reduce efficiency and component life. Metallic labyrinth seals also suffer from corrosion and erosion damage in high acid or mercury and high velocity environments.

Greene, Tweed’s Arlon® 4020 labyrinth seals deliver superior performance by combining custom-engineered tooth designs and high-performance thermoplastic materials. Our solution incorporates a tooth profile with outstanding dimensional stability, allowing for a cyclic flex-and-return motion to withstand contact during critical speeds. This allows for tighter clearances, dramatically increasing efficiency and reliability for longer run times. The engineered tooth profile also creates a more controlled flow pattern, further
increasing efficiency by encouraging vortex generation and reducing “carry-over” media that can bypass chambers – especially in high velocity applications.

Arlon 4020’s excellent tribological properties reduce friction and wear during contact, eliminating gall to extend seal life and reduce maintenance costs. The material’s enhanced corrosion and erosion resistance make it ideally suited to severe sealing applications including high acid or mercury contents and high velocity media. The superior thermal expansion of Arlon 4020 allows for tight clearances at operating temperatures while maintaining the generous clearances of conventional metallic seals during ambient installation. This allows for retrofit and like-for-like replacement utilizing the same assembly techniques.

Features & Benefits

  • Flexible tooth profile delivers tight running clearances for increased efficiency
  • Reduced tooth contact loading eliminates permanent deformation for extended seal life and reduced maintenance costs
  • Engineered tooth design reduces mass flow rate to enhance sealing performance and increase efficiency
  • Enhanced corrosion and erosion resistance delivers exceptional performance in severe applications, including high mercury or high velocity media
  • Optimized thermal expansion allows for retrofit and like-for-like replacement of conventional metallic designs
  • Increased efficiency delivers energy savings and a reduced spatial footprint for dramatic cost savings and environmental benefits


Labyrinth seals for centrifugal compressors and dry gas seals in:

  • Oil and gas production
  • Air separation plants
  • Chemical industry
Labyrinth seal – made from Arlon 4020, approximately 25 in. (63.5 cm) diameter

Labyrinth seal – made from Arlon 4020, approximately 25 in. (63.5 cm) diameter

FEA of Arlon 4020 tooth flex-and-return capability

FEA of Arlon 4020 tooth flex-and-return capability


Typical Properties