Ken

Pros:
- Potentially increased long term reliability under poor climatic
conditions
- Improved high-impedance stability
- Liberty to reduce spacings to voltage gradients as high as ~200 V/mm
- Less risk of coronas for high-volts at altitudes > 15000 m
- Subsequent extrinsic contamination will change Zo less or have less
effect generally

Cons:
- Cost
- Requirement of near-perfect soldering/cleaning/coating process control
- Cost
- Testing/repairability may be more difficult
- Cost
- If problems occur due to e.g. trapped contamination or under-cured
coating, remedy may vary from difficult to impossible
- Cost
- Choice of "correct" coating type difficult for application
- Cost
- Requirement for stoichiometry with 2 or 3 component types
- Cost

Oh! and did I say that a good preparation and application may cost you a
little?

Brian

Ken Patel wrote:
>
> Guys,
> What are the pros and cons of Conformal Coating on PWAs?  Who are vendors in
> San Jose Bay area?
>
> re,
> ken patel
>
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