> Neutral cure silicone rubber sounds like a reasonable match.
> It's not instant cure - for that use hot-melt to locate short term and
> silicon rubber for the long term bond.
>
> It is removable, depending on what area you choose to use.
> Can be 'thinnish'.
> Will ooze out under pressure unless suitably designed.
>
> I recently tried to remove some aluminum L brackets from PCBs. Just what =
I
> needed for a prototype. These were assembled and bonded 10+ years ago and
> had been used as mechanical attachment plus heatsink to fram (exercise
> bike).
> They were fixed with 2 small screws (3mm, threaded hex but) PLUS silicone
> rubber under the contact face.
> After a small while I gave up an went and found some other Al material. I
> could have removed this with enough effort but the bond was superb. This
> was Al onto soldermask.
>
>
I recently tried to remove a dead point-of-load switching regulator=20
(V7805-1000R) that was glued down with neutral cure silicone and nothing=20
else (besides the 3 pins). I completely destroyed the regulator=20
eventually leaving only the bottom plastic casing wall still adhering to=20
the PCB.

It was 17.5 x 11.5mm. The assembly process was to put a dab of silicone=20
under the part and clamp it down for at least 30 minutes... the clamp=20
pretty much spread the silicone into an extremely thin layer under the=20
entire bottom face of the part.

I think I'll need to use a dremel or throw it on the mill to get it off.=20
It's on the "TODO: repair" parts pile.


Darron

--=20
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