Home-made Flash Bangs

hey everybody, i'm looking to find out how to make the most efficent, cost effect and relatively DIY flash bangs for your day-to-day blinding needs. i know there are some fairly routine methods follow out there, but i am hoping that if enough of us instructabilians share our knowledge and experiences it will be possible to create a dam good design. thanks for your help

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fehdrummer5 years ago
It depends on the quality of your materials, but what your going to want to do is take magnesium powder, thermite, potassium perchlorate, sulfer, and using a static reducing spray on the surface you want to mix them VERY CAREFULLY. if you don't have the means to make thermite (like me) use some diesel fuel (about 4% of the mixture) and aluminum powder, thermite will ensure that the magnesium lights. you want a ratio of about 7 potassium perchlorate to every 4 magnesium, thermite and sulfur mixture. you should wrap this in any kind of tube formation, and use a long fuse (if you have any mortors lying around these are my favorite) and if you think kind of like the more compact the explosion, the better the flash and the bang, you will be better off. you don't have to worry to much about suffocating the mixture because potassium perchlorate is an oxidizer and you should be alright. if you can't find a static reducing spray you can also use a solution of 9 parts water to every 1 part fabric softener. other good explosions that may be easier to make are ammonium nitrate bombs (96% ammonium nitrate rich fertilizer, 4% diesel gasoline, and magnesium- powdered or ribbons) and PTER
Qcks fehdrummer5 years ago
Actually.... it's the other way around.
The magnesium ignites the thermite.

I mean.... I'm assuming you're refering to the high temperature redox reaction between iron oxide and aluminum.

Thermite needs extreme temperatures before it can occur because the iron oxide has to loosen it's grip on the oxygen, and that doesn't start happening until some fairly high temperatures.

After the iron oxide releases the oxygen it bonds to the aluminum, leaving the iron, which tends to convert into a plasma state since it absorbs most of the free energy released by the reaction, free to recombine with atmospheric oxygen.

Iron Plasma tends to burn bright.

If you have a vacuum or an oxygen free environment to cool the Iron in , this is a great way to make pure iron.

Magnesium burns readily in an oxygen rich environment, and that can occur by heating the magnesium with a cheap lighter for a few seconds. The sustained temperature increase is such that it can initiate a thermite reaction.
fehdrummer Qcks5 years ago
I didn't know that, I always thought that magnesium would have to reach a very high temperature before igniting because of only seen anyone do it with a blow torch. You don't necessarily need the thermite in the reaction, just the aluminum powder, potasium perchlorate and sulfer. I haven't actually fooled around with any of it yet, I get most of my recipes from finding information on web forums and then going to the TM 30-210 army improvised munitions handbook to see if it would be possible for that reaction to take place, this is one that I have always been a little fuzzy on, and I don't know how the reaction takes place because as I've said before, I have never worked with magnesium aluminum or iron powders. If you were to run a current through the thermite before (super thermite I believe?) would that make it easier for it to ignite? because I was relying on the themite to ignite the entire thing.
Qcks fehdrummer5 years ago
Ehh... any reduction in the auto ignition temperature is probably going to scale with the electricity you put into the process. In most cases... you'd probably be better off making an electrical arc to ignite the thermite. Electrical Arcs are basically a form of plasma. They're thousands of degrees in some cases, and can jump start a number of high activation energy reactions, assuming they're self sustaining after the initial electrical input.

Be careful with the potassium perchlorate.
it's notoriously unstable. Light, heat, age.... lots of things can spontaneously ignite it. i'd suggest using a more stable oxidizing agent like nitrate or sulfate.

Since we're talking about electrical explosives.... A very rudimentary capacitor can be made by mixing aluminum powder into Vaseline. the amount of electrical charge that can be stored on the aluminum/vaseline capacitor is dependent on the concentration of aluminum powder; since you want the capacitor to overload, you kinda have to find your balance. too much aluminum powder and it wil take a huge charge to detonate. Not enough aluminum powder and it won't properly conduct electricity.

Anyway... just some ideas.
fehdrummer Qcks5 years ago
Good ideas, but because it's a flash bang, wouldn't any electrical ignition be hard to put into something that needs to be small and light enough to be thrown by hand a distance of at least 10 yards? It seems like the best way to go might be to just put a non-electrical blasting cap into it, ignite the fuse and hope that it doesn't fail?
Qcks fehdrummer5 years ago
A capacitor is going to take a small amount of time to overload.
Depending on the voltage and amperage of the power source and the capacitance of the capacitor, it could easily take several seconds to overload the vaseline/aluminum powder mix.

As an aside, you could use any powdered metal, including Magnesium, but depending on the reactivity, that could be really dangerous. Magnesium powder isvhighly explosive.
fehdrummer Qcks5 years ago
I just recently realized you could just take a 7:4 ratio of potassium perchlorate and 400 mesh aluminum powder and mix them. Not nearly as hard as I was making it out to be. if you take a wooden stick and rap a bunch of 1-3 inch strips of paper around it in the same spot until you get a thick layer, about 1/2 to 1 inch in diameter and tape it off you can make a container and then just cap one side, fill it, cap the other side and put in a fuse. Very bright flash, very bright sound, and you don't need more than a few grams. probably the cheapest way, especially since you can get aluminum powder pretty much anywhere. I don't know the exact procces to making potasium perchlorate but as far as I can tell it goes hand in hand with pottasium chlorate which you can make with bleach and some potassium chlorate which is a substitute for table salt. People made it way harder than it needed to be
nurdee15 years ago
Look at this instructable. It isn't a flash bang but it is blinding;

InsaneWrath5 years ago
If your in to more serious stuff you can take phospherous and black powder in an air tight tight completely filled but keep phospherous on the top and do not expose to air it will ignite thats why its the igniter then on the top of the outside of the tank add magnesium fuses for that extra shine
Get an inside aluminum can, mix Thermite, Aluminum, and Ammonium Perchlorate, then put an extended fuse in there, seal most of the can, put it inside an outer steel can that has an inside diameter of 3 inches, and is grade 80, then drill holes in the outer steel casing. Would this work as a decent flash bang? Would the pressure and heat be too much and damage the structural integrity of the outer steel casing? Could the PSI be deadly?
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