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1. What is the best material for my main turbine guide bearing as I have a lot of particulate in the river run off?

Thordon Composite is made specifically for use in very abrasive water environments. It is stiffer and has at least twice the abrasion resistance of rubber as well as a lower friction coefficient.

2. Can you supply staves for turbine guide bearings?

Yes - SXL is available in staves

3. What is the best shaft mating material for Thordon turbine guide bearings?

Many materials are acceptable - Bronzes, stainless steels and various hard coatings  available.  For high abrasives content, best results obtained using 40 Rc with suitable corrosion resistance