Ramon

Whatever the coating type, I would say that the coating would have been
affected - but to what degree?

Has the circuit you talk about failed?

If it hasn't failed, then what is your concern?

If the circuit is working OK, then the coating is doing its job. It might
have been affected, but not enough to cause or contribute to failure.

I hope this helps.

Graham Naisbitt


On 1/2/05 8:56 pm, "Dehoyos, Ramon" <[log in to unmask]> wrote:

>
> Graham:
> Do you feel the same with using polyurethane coating? I want to reemphasize
> that I am talking about fumes, not direct contact and this boards are not on
> jets at all. Boards in cabinets and jets are on adjacent floors and the fumes
> get to the boards through the ventilation system.
> Thanks,
> Ramon
>
> -----Original Message-----
> From: Graham Naisbitt [mailto:[log in to unmask]]
> Sent: Tuesday, February 01, 2005 2:48 PM
> To: Dehoyos, Ramon; IPC TechNet
> Subject: Re: [TN] Coating
>
>
> Ramon
>
> We have a good deal of information but what is it you want to know - is the
> coating likely to have been adversely affected? Yes.
>
> Should you consider stripping and re-coating the assemblies after
> troubleshooting is done? Yes.
>
> Kerosene is a really good stripping solvent for most polymer materials.
>
> I was once asked how an acrylic coating would behave when exposed to skydrol
> (a really aggressive aviation hydraulic fluid) being sprayed onto a circuit
> in the cockpit of an aircraft. My response?
>
> It doesn't matter - the pilot has already left!
>
> I hope this helps

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