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Subject: Re: [Homebrew_PCBs] Ferric chloride staining PCB substrate

From: Russell Shaw <rjshaw@...>
Date: 2017-07-04

On 04/07/17 04:57, 'Technotronic~Dimensions'
infotech@... [Homebrew_PCBs] wrote:
> Hi
>
> Sorta new here and trying to catch on to some of the procedures described
> here.
>
> Was wondering if anyone knows if theres a chemical or chemicals (s) that
> will safely dissolve epoxy that some manufacturers
> use to encapsulate boards to protect them and make them more or less
> unservicable when a component fails?
>
> I have hears there is a chemical that they can be soaked in for many days,
> and you have to check on it daily before it eats through
> things that u dont want it to damage.

An easy way is to have a stream of hot air directed at the board (hot air gun on
a stand), and pick away at the epoxy with a thin sharp screwdriver and thin pliers.

Hot epoxy goes soft and rubbery.