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October 2004

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TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Mon, 11 Oct 2004 07:48:38 +0800
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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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Lum Wee Mei <[log in to unmask]>
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Hello,

Since we are on electrolytic cap, how about conformal coating (acrylic) on them?
We have been coating them since day one as no one has instructed that
electroltic cap cannot be coated.

Recently, there have been opinion that we cannot coat them as there will be no
gap for the pressure to escape - similar to the below issue?

What are your opinions?

Regards,
Wee Mei


Quoting Brian Ellis <[log in to unmask]>:

> It depends on what cleaning medium you are using. If you are using a
> halogenated solvent and just a microgram penetrates inside the casing,
> you will see customers complaining of failures after 6 months to 2
> years. This is well-known and was publicised by Sprague in the 1960s.
> This company recommended using only hermetically sealed elcos if
> cleaning in halogenated solvents. They also tested aqueous cleaning and
> determined zero effect by aqueous cleaning, including with saponifiers
> which could cause superficial corrosion of the outer case. However,
> IMHO, it always makes sense with aqueous cleaning to have each stage
> slightly warmer (say 5 deg C) than the previous one, so that you always
> have positive pressure inside the cans while they are wet, to prevent
> the ingress of contaminated water.
>
> Brian
>
> Scott Lefebvre wrote:
>
> > We have a problem with the plastic disk coming off after being process
> through our In-Line PCB washer.  What concerns if any should I have.
> >
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