Hello all you technetters,

Question for all the "high-freq" guys out there.
We have been building PTFE boards quite some tme and a long-running problem
has been the solderability of these boards. They are .018" thick and are
used for high frequency applications. The spec is for tin immersion plating.
No matter what reflow profiles I use, there are non-wetting signs all over
the board. The solder just won't flow properly on the pads. It looks as
though the solder flows, then stops. I've eliminated surface contamination
by washing the boards prior to build and still the same problem. Are there
any other platings available that will promote flow and won't affect high
freq reliability. Please help. Thanks.

Jason Gregory
Process Tech
Tadiran Microwave Networks
(281)263-6671
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