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'[OT] conductive epoxy (and SI :)'
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)]...
At 06:50 04/19/99 -0400, Mario I. Arguello wrote:
>Why not make your own conductive epoxy. Regular epoxy mixed with copper
do you have any idea why they might be using nickel and not copper?
|>Why not make your own conductive epoxy. Regular epoxy mixed with copper
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.
Electronical devices for chemical laboratory, custom electonics design
Snail Instruments Josef Hanzal, M. S.
Vojanova 615 phone/fax: +420-311-24433
266 01 Beroun e-mail: iol.czsnail
Czech Republic URL: http://www.vitrum.cz/snail/
You can buy very fine ground graphite powder in an artists' shop. It is also the best lubricant for car door locks.
FrŒn: Snail Instruments <IOL.CZ> snail
Till: MITVMA.MIT.EDU < PICLISTMITVMA.MIT.EDU> PICLIST
Datum: den 20 april 1999 19:18
€mne: Re: [OT] conductive epoxy (and SI :)
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.
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