machining teflon

Hi:
Does anybody have experience machining teflon parts?
I need to know what a suitable feed rate and RPM, to machine a part
out of a 6"x6"x.75", These material is quite expensive, so trial and
error is not an option.
Im affraid that it will behave similar to Nylamid or some other
termoplastics, which melt instead of chip when using a wood router
(27,000 RPM).
Any input would be greatly appreciated.
best regards
Fernando Mayrl