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theh0ser
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[*] posted on 6-12-2003 at 18:56
thermite compositions


i mixed red iron oxide and ground up aluminum foil, and i tried igniting it with a piece of magnesium ribbon but it didnt work. im assuming it was because i didnt use aluminum filings but i heard that foil works...any sugestions?



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[*] posted on 6-12-2003 at 19:07


The aluminum must be finely divided and intimately mixed. Foil doesn't work.

This is also not pertaining to this section. There are many threads on thermite here and other places, make use of the search function.

[Edited on 7-12-2003 by Haggis]




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theh0ser
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[*] posted on 6-12-2003 at 19:19


ya sorry bout creating a new section...why is it that aluminum foil wont work?



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[*] posted on 6-12-2003 at 19:23


hmmm.... back when I had no Al powder, using Al shavings, I still could get it to work!!! So no excuses, start getting inventive boy!
Like, tie a few sparkling candles together and light them, it will work as it generates enough heat!




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[*] posted on 6-12-2003 at 19:27


well what i did was put aluminum foil in a coffey grinder until it was fairly well shredded and it jus wouldnt ignite...i got really frustrated and kicked the whole thing over



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[*] posted on 6-12-2003 at 20:09


well it's important to get the right proportions.
Of my head its 160 vs 40 g of Fe2O3 vs Al.
I honestly dont see why you cant get this to work. I did it with Al shavings, which were in part 1mm thick and 5mm long, so MUCH worse than your Al foil!
So... with the right proportions of the reactants, and sufficient heat (several sparkling candles), you have no excuse left to not to get it to work !!! :D:D:D




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[*] posted on 6-12-2003 at 20:20


Ive never worked with aluminum foil but I believe there is some coating on one side of it, that might be part of the problem of using it as the reducing agent in your thermite comp.



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[*] posted on 6-12-2003 at 20:23


I hope you have a scale because you can't use tablespoons or stuff like that. What masses more a kg of lead or a kg of feathers?:P Today I used a blender to make some Al foil and right now I am drying it. I think it would be ok to blend the thermite together in a blender with some water because thermite needs so much thermal energy before it lights. Don't get mad and kick it over! What if you did that with H2SO4:o



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[*] posted on 6-12-2003 at 20:50


ya i think there is a layer on one side that can be removed with vinager but i skipped that step...what do you mean you were letting the AL foil dry after being in the blender...what was there to dry...i tried lighting my failed thermite with magnesium ribbon but it kept going out cus of the lck of oxygen



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[*] posted on 6-12-2003 at 23:06


One way to make Al powder is to run in a blender full of water, or some other things. I'd assume he's letting the water, or other liquid, evaporate off. If you just do it in air, the Al clogs the bearings of the blender eventually. You can also only get it so fine due to the resistance of air on the foil.

I also really doubt the ability to be able to remove the layer with vinegar. Here it's a waxy substance. I don't ever bother is trying to remove it, as the powder still works well. I suppose washing with a non-polar substance could maybe do it.
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[*] posted on 7-12-2003 at 04:58


What is this layer?
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[*] posted on 7-12-2003 at 06:53


Mumbles is right. I added a cup of water to keep it cool. I also tried making KNO3 fuse by disolving KNO3 in water and dipping a cotten string in it. After drying it burns slowly but reliably. Anyone else done this?



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[*] posted on 7-12-2003 at 14:22


For gods sake! Don't you people read what Polverone said about the practical side of pyrotechnics?? :mad:

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