From the Army Corps of Engineers
“The original hydro turbine bearings made of Lignum Vitae, lasted from 1934 to 2001. The Lignum Vitae bearing design kept the hydro turbine in service for sixty-seven years!
Modern composite metal bearing materials such as Thoradon, Ryetex, Mycarta, and Phenolics are unacceptable materials due to their inability to match the characteristics of Lignum Vitae.”
-- Gary, Los Angeles, video game animator