gelcoat cylinder liner tearPolySlide® composite cylinder tubing eliminates known problems with older gel-coated tubing. Advantages include:

  • Inherently self-lubricating composite wear surface
  • Lower coefficient of friction during cycling
  • Longer seal life during operation
  • Eliminates manufacturing concerns related to EPA regulations
  • No delamination of gel-coated liner is possible
  • Impact and fatigue resistance of liner is improved
  • Higher degree of embeddability of wear surface

comparison line graph

The gelcoat bore surface will not delaminate. This was a common concern with gel-coated cylinders. Adhesion friction is also improved.

Case Study: Endurance Test of Legacy-Era Gel-Coated vs. PolySlide®

composite cylinder endcapsIn this study, three 4"x10" stroke cylinders of a gel-coat and PolySlide® cylinder were mounted vertically with a 10 lb. weight attached to the rod end. The test pressure was set at 42 psig and the cylinders were allowed to cycle freely through a 7" stroke for 5,000,000 cycles. The cycle rate was primarily governed by the seal resistance due to friction between seals and bore surfaces. The chart below shows how the average cycle rates changed throughout the tests between the two types of cylinders.

comparison bar graph

This chart shows the seal weight loss during testing. The seal wear rate was 40% more for the gel-coat cylinder.


Any ratings are typical for design purposes. Your design parameters may affect final ratings. Consult with a Polygon sales engineer for guidance. Final testing and approval is the customer's responsibility for their application. This information is derived from our testing and published data. There is no assurance of these properties, or warranty provided that these products are suitable for any particular purpose or operational situation.

Polygon certifies that their product will be free from material defect. Polygon will not accept any liability for loss, damages, or costs from use or misuse of our products.

Specifications are subject to change, and may be affected by our continual process of improvement. Changes may be made without prior announcement.