Though silver solder is designed mainly for bonding its namesake, it’s useful for just about any metal. The stuff ships in thin sheets which are designed to be cut into small pieces (pallions, for the picky), so you can pre-place exactly as much as you need in precisely the right location. The process is similar to brazing, but is less likely to damage fine or thin metals. A careful user can fuse two 0.025 in. copper wires end-to-end. The end result is also much cleaner than lead- or tin-soldered joints, and with proper technique, stronger as well.
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Soldering isn’t your only option for an electrically conductive connection. MG Chemicals sells one alternative — the two-part silver conductive epoxy pictured above.
When the silver epoxy cures you’re left with a bond that’s not only high strength, but also highly conductive to electricity. You can use it to connect heat sensitive components, connect broken traces, or even bond heat sinks. The epoxy bonds well to metals, but it also bonds to glass, wood, paper, fiber and rubber.
One drawback to using this epoxy is that you can’t solder to it and you need to be careful soldering around it because it might melt. Another is that you have to wait 4 to 5 hours for it to cure.
Prices for MG Chemical’s two-part silver epoxy start at $25 for two 3mL syringes.