Neil,

Now that the liability is clearer, I assume that your product is in=20
a plastic enclosure of sort. So maybe a plastic film over the PCB
before you do the potting would allow easier rework. But you need to check =
the thermal effect of air trapped in the box.

Jean-Paul
N1JPL

> On Feb 5, 2016, at 6:01 PM, Neil <picdude3@narwani.org> wrote:
>=20
> Not a car manufacturer.
>=20
> At hundreds of dollars for each unit, I wouldn't mind them needing a=20
> change, and having to sell them new units because of the potting. :) =20
> But seriously, I'd think conformal coating and rubber shock/isolation=20
> mounts would be more than good where these are (cabin area), and=20
> especially for the first 10 pilot-run units, I'd really feel better=20
> knowing it's still relatively easily tweakable.
>=20
> I've found some products that claim to dissolve potting compounds, but=20
> I'm hoping to get some real-world experiences with these, rather than=20
> just the manufacturer's claims.
>=20
> Cheers,
> -Neil.
>=20
>=20
>=20
>=20
> On 2/5/2016 5:13 PM, Jean-Paul Louis wrote:
>> Neil,
>>=20
>> Is your customer a car manufacturer?
>> If so, potting is often required for critical use (anything that when fa=
iling
>> can endanger occupant of the cause, or cause danger to someone due to fa=
ilure)
>>=20
>> If so, you cannot repair such device. You replace it by a new one, so re=
moving
>> the potting compound is not an issue.
>>=20
>> Otherwise, You need to check the data sheet of your potting compound to =
see what will
>> dissolve it. Very often, what can dissolve a potting compound will also =
dissolve
>> IC packages.
>>=20
>> My $0.02,
>> Jean-Paul
>> N1JPL
>>=20
>>=20
>>> On Feb 5, 2016, at 3:59 PM, Neil <picdude3@narwani.org> wrote:
>>>=20
>>> Hi all,
>>>=20
>>> I'm building some boards for a customer and was planning to conformal
>>> coat it to protect it (automotive environment), but he wants me to pot
>>> it.  I'm not thrilled about that because this project has had a lot of
>>> incremental changes over the past couple years, and if I have to make
>>> any other electronic changes it would be difficult.  And these are
>>> relatively expensive circuits.  Before I cave, is there anything I can
>>> reliably remove potting compound with?  Research so far indicates that
>>> heat works, but is still a tedious process.  Are there any known
>>> chemicals that would work for this?  Or any specific types of potting
>>> compounds that would be easier to remove?
>>>=20
>>> Cheers,
>>> -Neil.
>>>=20
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>>=20
>=20
> --=20
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