Inge,

Sure it helps!

I remember one trip through 85/85 with Cu and Ni filled solder substitutes -
what a joke!  Had to pick all the pieces up from the floor of the chamber.
Board traces oxidized, copper-filled adhesive all yucked up.  Nickel-filled
looked good, but the copper traces beneath oxidized.

    Don't even begin to think of autoclave!

Don't put it on OSP

For certain consumer products with a gentle environment and shock
conditions, with the correct component terminations, I could see it working
- just don't flex the board  :-)  

Would not want them in Patrick's nuclear power generation application.

Steve G - cloudy and overcast & raining here.  Talk about needing that lost
hour of sleep!

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Monday, March 12, 2012 1:42 PM
To: [log in to unmask]
Subject: Re: [TN] Assembling with conductive adhesive

Mr Trikeman,
we have in fact tested the idea a number of times and we mean that  there
are essential benefits:

- you need no solder mask
- you can create extremly small dots, < 50um
- No Lead of course
- you need no cleaning processes
- can be applied on 'any' surface
- cure at << solder temp
- thermal and mechanical stress resistivity better

I don't think I remembert all plus'es

On the negative side:

- Customers do not accept 'glueing' , as some use to say
- much higher repair cost
- thermal conductivity not as good as pure metal (solder alloys)
- for super large/super dense boards, the yield was not acceptable
- I remember there  were some more negatives, but I don't remember

So, the positive and negative aspects are about fifty/fifty, and that was
enough for the pennymen to say 'no' for the 'glue' to step in.

Inge

PS. One more negative came to my mind: can be applied to 'any' surface, that
means boards and substrates. However, not likewise for many components,
which had contaminations in the micro size. Dirt that resulted in poor
contact with glue, was no problem at all with wave soldering.

Hope this does not help

Inge




On 12 March 2012 16:39, Steve Gregory <[log in to unmask]> wrote:

> Hey all,
>
>
>
> Wish I hadn't lost that hour of sleep this weekend, I'll try to find 
> it tonight. :o)
>
>
>
> Anyways, have any of you thought of trying to replace solder with a 
> conductive adhesive for PCB assembly? There's a few out there (Henkel, 
> Cookson, Ellsworth, etc.) that are touting them as solder replacements.
>
>
>
> When I read the technical datasheets, I'm thinking to myself, why 
> isn't this stuff more widely used? There must be a reason.
>
>
>
> I do know it's pretty expensive almost all of them are silver filled, 
> and I have read that the mechanical strength and thermal conductivity 
> is not as good as solder, but what other reasons are out there not to use
it?
>
>
>
> Steve
>
>
>
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