Hello TechNetters,

I've started the process of evaluating the coating type that we use today.
We are manually applying (brushing) Electrolube DGA and I would like to
change it to something better. The only demand we have on coating is to
prevent current lackage at the assembled boards and using Electrolube DGA
feels bit like overkill. Electrolube DGA has quite good properties but the
curing time is long and, because the Remover (Electrolube DRG) is forbidden
in Sweden, it is almost impossible to remove it. I would like to find
something that's easy to apply and remove, fast to cure, and protects the
PCB's from current lackage.
Solutions that are avilable on the market are many but there are few that
meet those demands that I have on coating.
Some of those few that are satisfying are Certonal TL6x (fluorinated
coating) and 3M's EGC1700 (fluorochemichal acrylate polymer). Both of those
are applied by dipping are doesn't require masking of the components. Those
would also, I believe, satisfy my needs in the way to protect the PCB from
moisture and prevent ionisation and are easy to handle but on he other hand
are not UL-approved for some reason. We are exporting our products to
Canada and US a lot and that's why I got to address my questions to this
forum. :)
My questions are:
If the bear PCB board is UL-approved, does all the other components that
are mounted on the board got to be UL-approved? If not, can I consider
coating as a component mounted at PCB board?
If the instrument that PCB board is mounted in is fire preventing (fire
eliminating), does the PCB got to be fireproof?
Is there any other UL approved coating type that is around 1µ thick and has
curing time less then few hours?
Is there any other method to prevent ionisation that helps developing
current lackage or noise jamming than encasing the components?

I hope that some of those questions will be answered. :)

Thanx,
Sasha

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