Tetra treatment is a "treating", or washing of the board with a chemical that
is just about everyone's worst nightmare.  It is a dispersion of Sodium Metal
in an organic solvent.  Teflon is about a slick a surface as most of will
ever encounter, and also it is chemically unreactive.  Teflon requires a
chemical as reactive as Tetra Etch, or other equivalent, to change the
surface from Teflon to a more reactive form of the plastic, such that it will
bond to virtually anything.

Effectively what Tetra Etch does is to change the surface from the usual
completely fluorine surface to a more reactive Carbon surface.  This only
treats just the surface, so, I suspect the electrical properties are not
noticeably changed.

Hope this helps.

Rudy Sedlak
RD Chemical Company