MM: in this my post, I responded to you with certainity and with some laugh only as for your first inquiry, which was: "Please provide some examples of materials you believe should have commonly existed in the dust of the WTC, that would be expected to ignite around 430C." Apparently, there were hundreds of materials in WTC based on carbon stuffs (not only paints) which basically fulfill this condition.
The response to your second question above is definitely more complex and I tried to express my current opinion in the second part of my post.
But, you basically inspired me to ask here another interesting, theoretical question (for me, Oystein and any other potential enthusiasts):
It is clear that bulk charges of thermite can reach extremely high temperatures when burning. But, is it even possible that burning of thermitic chip 20 micrometers "thick" (with attached iron oxide layer also ca 20 micrometers "thick", but this can be omitted for simplicity) could generate temperatures close to melting of steel or iron oxide?
I vaguely remember that someone (Dr. Greening?) calculated the elevation of steel temperatures caused by burning of such a layer (?) of nanothermite. but I cannot find the link now...
Some basic inputs for calculations can be like: 1) The active layer consists of well-packed pure nanothermite (no binder); 2) The burning of nanothemite is basically instantaneous. 3) For simplicity, chip is burning surrounded by standing air, therefore only radiation and convective heat losses in air take place.
Any ideas?