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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