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.
> >
> > ---------------------------------------------------
> > Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> > To unsubscribe, send a message to [log in to unmask] with following text in
> > the BODY (NOT the subject field): SIGNOFF Technet
> > To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> > To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> > Search the archives of previous posts at: http://listserv.ipc.org/archives
> > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> > -----------------------------------------------------
> >
> >
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> -----------------------------------------------------
>

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------