Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default TIP: Poor man's conductive epoxy

I have some 20 year old silver loaded paint/ silver conductive paint
Electrolube SCP003 ,kept in a 35mm film pot, in fridge. It cannot be called
paint now, but not totally dried out, more like paste. I mixed a little with
the resin part of some also quite ancient but good epoxy , bulk 1kg purchase
about 10 years ago, also kept in fridge (red cap = resin ? any standard ?)
Left the mixture overnight and it was same pastiness, ie no/little cross
reaction.
Prepared a pair of 1.65mm wide , flat , brass pins, by cleaning with
methylated spirits only and drying off, deliberately no abraiding. One pin ,
wrapped 2 separated loops of 0.02mm insulated wire around as a precise
separator.
2 hours ago wixed with the hardener and placed between the spaced crossed
pins, held with a wooden clothes peg , holding force about 0.5 Kg.
I just tried measuring resistance between pins. Did not think , in advance,
about soldering fine wire to the pins for ohms testing. Connecting 2 croc
leads to the crossed pins, still with clothes peg, resistance varied between
3 and 35 ohm , holding in fingers. Highly sensitive to slight forces in
semicured state.
Will let it cure until tomorrow and retest conductance and also peel/sheer
strength of the epoxy. To be continued

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/


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Default Poor man's conductive epoxy

N_Cook wrote in message
...
I have some 20 year old silver loaded paint/ silver conductive paint
Electrolube SCP003 ,kept in a 35mm film pot, in fridge. It cannot be

called
paint now, but not totally dried out, more like paste. I mixed a little

with
the resin part of some also quite ancient but good epoxy , bulk 1kg

purchase
about 10 years ago, also kept in fridge (red cap = resin ? any standard ?)
Left the mixture overnight and it was same pastiness, ie no/little cross
reaction.
Prepared a pair of 1.65mm wide , flat , brass pins, by cleaning with
methylated spirits only and drying off, deliberately no abraiding. One pin

,
wrapped 2 separated loops of 0.02mm insulated wire around as a precise
separator.
2 hours ago wixed with the hardener and placed between the spaced crossed
pins, held with a wooden clothes peg , holding force about 0.5 Kg.
I just tried measuring resistance between pins. Did not think , in

advance,
about soldering fine wire to the pins for ohms testing. Connecting 2 croc
leads to the crossed pins, still with clothes peg, resistance varied

between
3 and 35 ohm , holding in fingers. Highly sensitive to slight forces in
semicured state.
Will let it cure until tomorrow and retest conductance and also peel/sheer
strength of the epoxy. To be continued

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



Minimum resistance about 200 ohm, shear or peal strength ? was 90gm at 13mm
distance to shear the joint.
Proportions were something like 2 Ag paint:1 hardner:1 resin , so perhaps
4:1:1 would be better and also newer product preumably. So for CMOS type
currents application not car windscreen heater repair use


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



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