Homebrew PCBs

Your post got me thinking...what if you could make a putty/paste out of a copper or tin powder? Then squeegee this putty/paste into the holes (or perhaps inject it with a syringe) where the vias are going to be, then solder them?.....just tossing out some ideas.




--- In Homebrew_PCBs@yahoogroups.com, "a3v03v0" <a3v03v0@...> wrote:
>
> Has anyone tried used a conductive pen such as the ITW Chemtronics
> CW2200MTP for making vias conductive.  Once the via has been treated
> with the pen it may be possible to solder it with a low temperature
> solder.
> 
> Found this
> 
> "Curing: Tack-free in 3 to 5 minutes at room
> temperature. Achieves electrical conductivity
> within 30 minutes. Heat cure for 5 minutes at 250
> to 300°F (120 to 150°C) for maximum conductivity,
> durability and chemical resistance.
> 
> Soldering: Low temperature soldering is possible
> to the heat-cured silver conductive traces if done at
> 350°F (177°C) for <5 seconds."
> 
> Note: Solder iron tip temperatures are most commonly between
> 315-371°C (600-700°F) for Sn63Pb37 and
> Sn62Pb36Ag02 alloys.
> 
> It looks like we have to use a low temp solder. SnIn20Ag2.8 may work but
> I have not found a source for it.
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>