[R-390] mechanical filter solvent

[Bob Camp]

Hi

Epoxy has exactly the same "crush forever" characteristic. It's also  
real hard to dissolve.

Bob


On Nov 8, 2007, at 9:35 PM, Craig C. Heaton wrote:

> Charles,
>
> Haven't found the magic juice, yet! I can tell you that rubbing  
> alcohol,
> acetone (finger nail polish remover), gasoline, MEK (methal ethel  
> ketone
> sp?), paint thinner, did not touch the potting stuff (black in  
> color) on the
> bobbin/filter I've played with. Didn't faze the bobbin either!
>
> I have the feeling this potting fluid is really the same material as  
> the
> bobbin. Food for thought; if the bobbin and potting stuff is delrin,  
> the
> stuff that is used for the gears in the HP 8640B sig-gen, it shrinks  
> with
> age. So the bobbin & potting fluid shrink, crushing and breaking the  
> #42
> wire wound on it.
>
> Craig,
>
>
>
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net 
> ]
> On Behalf Of Charles A Taylor
> Sent: Thursday, November 08, 2007 5:19 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] mechanical filter solvent
>
> Has anyone discovered the magic juice that dissolves
> the potting fluid on the bobbins?
>
> Charles
>
>
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