SKF
Gas Spring Seals
SKF gas spring seals are the sealing system at the heart of gas springs (gas struts) used in vehicle closure applications. They consist of a primary seal that retains the high-pressure nitrogen charge and lubricating oil, a secondary dust wiper that cleans the rod, and often a guide bushing that supports the rod. The seal package is typically integrated into the gas spring end cap. SKF utilises advanced polyurethane and NBR materials with carefully designed lip geometries to achieve low friction, minimal gas permeability, and high resistance to wear and compression set. The seals must function across a wide temperature span and remain leak-tight for the vehicle's entire service life, often exceeding 100,000 open/close cycles. SKF supplies these seal assemblies to gas spring manufacturers, providing validation support for new vehicle applications.
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High‑Pressure Nitrogen Retention
Low‑permeability lip material prevents gas loss.
Optimised Rod Contact Pressure
Balances seal and friction forces for smooth operation.
Dust Wiper Lips
Protect the primary lip from road grime contamination.
Temperature‑Stable Operation
‑40°C to +120°C without loss of force.
Integrated Guide Band Options
Seal body itself acts as a rod guide in some designs.
Long Cycle Life
Validated to over 100,000 open/close cycles.
Why a Sagging Tailgate Is Often a Gas Spring Seal Failure
When the seal loses its gas‑tightness, the nitrogen charge escapes, and the strut loses its support force. The tailgate sags, especially in cold weather. SKF’s gas spring seals are designed with an extremely low gas permeability coefficient, maintaining the strut’s internal pressure for the vehicle’s complete service life.
Re‑gassing a Gas Spring: Why Seal Integrity Is Critical
Some workshops re‑gas old struts. If the seal is worn or damaged, the new gas will leak out within weeks. SKF supplies seal replacement kits that go along with re‑gassing, ensuring the new charge remains contained. The seal’s lip profile is critical; a standard O‑ring cannot replicate the dynamic sealing of a purpose‑designed gas spring seal.