Expert: Mike Fulcher - 7/28/2006

Question
You may not be able to answer this but...

Do you know of a way to bond thermite into a paste without affecting the ignition, temperature, or burn rate? I have only ever seen thermite in its powder form and I have need to use it on a vertical surface.

Thank you for your time.


Answer
Interestingly enough, I have some experience from a past life with respect to forming and shaping thermite materials into usuable shape.  The biggest problem by far is that once you add enough binder material to have a workable solid you dramatically decrease the reaction rate and end up with less than desirable results.  You might want to try using a low molecular weight wax, adding just enough to get the powder into a formable shape.  You could also try using a "trough" with the top open that you can attach with adhesive to the surface you're trying to weld.  The thermite should burn fast enough to allow the adhesive to give the hold time you'll need.  Just make sure one end is open, to prevent any pressure build-up and subsequent explosion.  At a minimum it should be fun to watch.