Glycodur® F and A bearings are self-lubricating bearings with a PTFE mixture, completely lead free, which results in excellent dimensional stability and thermal conductivity.  Glycodur®  A bearings have a relatively thick top layer of polyoxymethlym (POM), featuring indented pockets for grease lubrication and , to some extent, are unaffected by misalignment.  Both bearing types have a copper plated steel base with a sintered tin bronze layer to which the PTFE and POM are solidly joined.