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'[OT] conductive epoxy (and SI :)'
1999\04\18@192737 by Gerhard Fiedler

picon face
maybe it helps one or another: i just saw a Master Bond announcement for a
nickel conductive 2-component epoxy (EP76M), surface resistance ~2 ohm,
volume resistivity 15 ohm cm (maybe for gluing vias on boards --there was
this thread in the last days :)

but: the thermal conductivity they give as "25 BTU/hr/ft^2/¡F/in" -- geez
:) when i wrote my example why i think SI units are cool, i thought i may
have exaggerated a bit in the part of the examples of "traditional" units
-- but obviously not. anybody out there who can make a case why, after
having calculated the electrical resistance of the epoxy using [ohm cm],
=anybody= would want to calculate the thermal conductivity in that
unimaginable unit above? i sure think [W/m K] -- or, if you want, [W/cm K]
-- looks =a lot= nicer :)

this independently of the fact that the above unit is wrong and should be
[BTU/hr/ft^2/(¡F/in)], which derives from the fact that thermal
conductivity is usually thermal flux ([W/m^2] or [(BTU/hr)/ft^2]) per
temperature gradient ([K/m] or [¡F/in]), which then combines to either [W/m
K]  -- or [BTU/hr/ft^2/(¡F/in)]...

ge

1999\04\19@065127 by MIADsgns

picon face
Why not make your own conductive epoxy. Regular epoxy mixed with copper
powder.

Mario
http://members.aol.com/microchper/miasportt.htm

1999\04\19@115926 by Gerhard Fiedler

picon face
At 06:50 04/19/99 -0400, Mario I. Arguello wrote:
>Why not make your own conductive epoxy. Regular epoxy mixed with copper
>powder.

do you have any idea why they might be using nickel and not copper?

ge

1999\04\20@131735 by Snail Instruments

flavicon
face
>Why not make your own conductive epoxy. Regular epoxy mixed with copper
>powder.

For some reason this is done with silver powder usually. Maybe copper
reacts with the epoxy, its sufrace oxidizes and looses conductivity. Once I
have tried antimony powder instead and it worked, but that is not advisible
due to antimony toxicity.

I had good results with another conductive glue - polysterene (or styropore
- foamed polystyrene) dissolved in acetone and mixed with graphite powder.
As graphite source I used a pencil refil, heated it in the stove to burn
the wax off and then ground with a razor. Hopefuly I have all the words right.

Josef


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1999\04\20@163259 by MEDICINTEKNIK KB

picon face
You can buy very fine ground graphite powder in an artists' shop. It is also the best lubricant for car door locks.

Sven

-----Ursprungligt meddelande-----
FrŒn: Snail Instruments <.....snailKILLspamspam@spam@IOL.CZ>
Till: PICLISTspamKILLspamMITVMA.MIT.EDU <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Datum: den 20 april 1999 19:18
€mne: Re: [OT] conductive epoxy (and SI :)


{Quote hidden}

1999\04\20@190947 by Gerhard Fiedler
picon face
At 22:33 04/20/99 +0200, MILTON MEDICINTEKNIK KB wrote:
>You can buy very fine ground graphite powder in an artists' shop. It is also
>the best lubricant for car door locks.

actually, you should get it in hardware shops, too. it's commonly used as a
lubricant with all kinds of metal where oil/grease is not appropriate.

ge

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