[volt-nuts] PCBs with ceramic substrates

[cheater00 cheater00]

Are conformal coatings the right way to handle this?

I understand there are kinds of FR4 and G10 that don't have hook. What does
one do about hook - how are those substrates improved? How does hook
manifest in circuits?

On Mon, 17 Apr 2017 03:48 David, <davidwhess at gmail.com> wrote:

> FR4 has problems with consistency.  Samples can have problems with
> hook, dielectric absorption, leakage, and sensitivity to humidity.
>
> On Sun, 16 Apr 2017 12:08:07 +0100, you wrote:
>
> >Hi Chuck
> >
> >But the context is "PCBs with ceramic substrates". Are any of *those*
> >tough? They may well be, perhaps you know of some? It does not help us
> >with the subject much if there are ceramics with these amazing
> >properties if they are not available as PCBs.
> >
> >There is also the question of exactly what properties of FR4 are
> >limiting for "metrology" use.
> >
> >John
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