The most obvious difference? This family of bearing materials requires perpetual greasing. When the lubricating film fails due to contamination, the bearing will prematurely wear. Performance of this bearing is entirely reliant on the end user properly maintaining and servicing the bearing joint in question.

Additional Performance Differences:

• Loads only to 20,000 PSI with lubrication compared to PolyLube™ dynamic loads to 30,000 PSI and static loads of up to 70,000 PSI without lubrication.
• Greased metal-backed bearing materials have very fine operating temperature ranges. They traditionally span from -40 to +210°F compared to PolyLube ranges from ±325°F.
• Once mixed-mode lubrication (grease &/or oil) fail due to particulate ingestion and contamination, this type of bearing can no longer operate successfully.