ENTEK is not a coating that affects the substrate. 
Rather, Entek is an oxide protection for the copper part of the 
board.  Your Teflon is likely covered by solder mask and will never
see the Entek.  Whether you select Entek or gold or HASL, your
Teflon substrate will likely see the same thermal excursions at 
assembly and it's temperature that is the prime concern for 
substrates. 

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On Thu, 7 Dec 1995, Davis, Phil wrote:

> 
> We are looking at eliminatingng the gold plating on some large (18" x 24") 
> microstrip boards by having the supplier coat the boards with ENTEK. These 
> microstrips are on Teflon (GXN) substrate.
> 
> 1) Does anyone have experience using ENTEK on Teflon sunstrate?
> 
> 2) Can we IR reflow the components to the board while using ENTEK? Do we 
> need to remove the ENTEK before assembly?
> 
> I would appreciate any help.
> 
> Phil Davis
> Manager Mechanical Engineering & Packaging
> Wilcox Electric, Inc
> 
>