Instructables
The watter mixed with the MRE Heating Pack makes gasses, the gasses expand the bottle to the point of breakage, so when the bottle "Decompresses" it sounds like an explosion simple since here... But loads of fun!

Please excuse the Number of steps, its easier then you think.

Warning - Use at own risk! The gasses from the MRE Heating Pack is very flammable, so I strongly suggest keeping it away from a open flame..

Also, Check with you town law to see if it is legal!
 
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Step 1: Things you need

You will need --

1-2 MRE Heating packs (use more or less for size of bottle i suggest one or two for a 18-24oz. bottle)

Plastic Bottle with screw on Lid

An some water.. (OH NO NOT WATTER!)

Step 2: First

First off, you open your MRE Heating Pack, and take out the actual heating package.. Make sure you can get outside fast, the last thing you want is for it to go off inside. But no worries, it doesn't become active until it comes in contact with a liquid.

Step 3: Secent

You can do this step many different ways, experiment and find the easiest to you, this is the method i use..

You rip the Heating stuff into long thin strips. an well you put it in the bottle.. (MY GOWD... ITS SO HARD!)

Step 4: Step 3!

Well... here is the hardest part of all... (haha doesn't get much harder then that last step eh?) But this will take the longest time to master... You add just enough water to cover about half of the MRE stuff... you can adjust to how much you use an what not it takes time to figure out how much u really need... but as soon as u add the water you put the cap on and make sure its nice and tight. then you take the bottle outside an shake well... once it starts to get hard you place it where u want and stand back and watch
lobo_pal5 years ago
What happens if you throw it in a fire, and what's the chemical reaction going on?
Mr.Asmith9 (author)  lobo_pal5 years ago
It all depends on the pressure, When plastic reaches a certain temperature it will start to either Melt or Shrink. If the Compression on the inside is great enough then it will "Explode" and if that happened the highly flammable gases on the inside will light on fire there for creating more of an actual explosion. I don't know what gases the heating pack puts off all I know is it is highly flammable.
Hydrogen
Any idea what chemicals you are mixing, nice name by the the way, loved Death Note.
Mr.Asmith9 (author)  lobo_pal5 years ago
No, If I had any heating Packs left I would just check the package, Try Googling "MRE Heating Pack" and see what you get. Never Played/Watched Death Note, I Randomly came up with Ryuk, and Antonio is my Name so *Shrug*
Oh, sorry. Good name either way.
You do know that you can get the SAME effect 1: cheaper & 2: faster with dry ice and water in a soda bottle. Then yor aren't wasting a nice MRE :D Cool idea though
Mr.Asmith9 (author)  The_pyrogeek6 years ago
Well, unfortunately people under the age of 18, if im not mistaken, cannot buy dry ice. Therefor we have to have a replacement. And it helps that i have 2 boxes worth of nothing but the heating back we jacked from some old junk yard buy sheer luck!
thats why you take your c02 tank (from paintball) put a bag over top and hold in the button. instant dry ice :D
N30N1NJ45 years ago
this was great, me and a friend taped the whole thing and might add it later. the bottle was at least 3 times bigger than before, only letdown- we had to shoot it with my bb gun for it to explode. wrong water-to-heating pack ratio. thanks!!!
radioeyes7 years ago
fun tip: take the tobasco sauce and put it in an opened heating pouch from a MRE. Instant pepper bomb!
is tat why you have radio eyes? it blew up in your face?
7626 years ago
It might be interesting to note that the MRE heaters release (a small amount) of hydrogen gas when they become active. If you were to substitute water for gasoline and an ignition source it might make a nice incendiary device.
Emankcin 7626 years ago
Absolutely not. The reason MRE heaters work is because of a chemical reaction between the solid (food grade iron, magnesium, and salt), and water. Just because the product is a liquid does not mean it will have the same properties, and thus, effects. Also, if try to put gasoline into a plastic soda bottle, the gasoline will melt right through the plastic. Adding salt might give you better results, as suggested before, but not anything like gasoline.
Mr. Deeds6 years ago
If you were to create and outer casing for this, and filled it with rocks, nails, or such, would it pretty much end up as a frag grenade?
Mr.Asmith9 (author)  Mr. Deeds6 years ago
I don't think so. I have put rocks, and other various items on the inside with no luck. I Highly doubt doing that would help. However, If you could some how have a bottle inside a bottle, And got them going. It might turn out better then you think.
moGuyver6 years ago
I suggest adding salt to the water... it acts as a catalyst and gets more reliable results. The old-school breakfast tray MREs used to come with saline packets instead of normal water to activate them.
X_D_3_M_16 years ago
seems fun to put this in a trash bag
you are smart y did i not think of that
I wonder if it was soaked with gasoline, would the heat be enough to ignite it?
Mr.Asmith9 (author)  MountainKING7 years ago
No, Not even close... The heat has nothing to do with what happens here. Its the build up of pressure. the heat makes the plastic shrinking yes, which also helps the pressure grow. But the heat is no where close to being hot enof to do that.
tenchi202297 years ago
if the gasses are flamable then if you do it next to a flame and it explodes then it would be a bigger explotion right?
Mr.Asmith9 (author)  tenchi202297 years ago
I would expect, yes, All I know is it would actually be an Explosion instead of a Decompression.
Mr.Asmith9 (author) 7 years ago
Yea, My myspace video is misspelled because i was in a rush, and it does make it look like a really long explosion time... For that one the total amount of time rounded out to be about.... 3 minuets, and that was kinda slow to be honest... But I did what I could to cut it down by putting minimal effort into it ..
That's pretty awesome. I guess if you have a surplus store or whatever near you this would be economical. Also, the myspace vid makes it look like a REALLY long explosion time. It's still pretty similar to a Dry-Ice bomb though. Nice Instructable.
tstens7 years ago
When I was on a tour in Korea with the Army, out in the field we'd sneak over to another team's site in the middle of the night and drop an MRE bomb in their trash bags...since we had to observe litter discipline they'd have to go and pick up every scrap of trash....ah, good fun.
Scissorman7 years ago
Cool first instructable. Makes me wish I didn't live in a built up area.
arngdad277 years ago
i would advice checking with the police befor you build one i know they are fun and simple but i am in trouble with a possibale class D felony for building one but if i get lcky it will be dropped to a serious misdmenor
It should be noted that you should check to see if manufacturing such a device is legal in your area. I say this only because I have a friend that is currently under house arrest for making dry ice bombs (same trick just using dry ice.) The judge almost sent him to prison.
Mr.Asmith9 (author)  Eric Stanton7 years ago
Oh, Wow that really sucks, Thanks for the tip!
meddler7 years ago
When i was stationed in Germany during my first tour in the ARMY we were in the field and 3 very large boar hogs came into camp, These are mighty dangerous animals so no one rightly wanted to mess with them. We quickly made an MRE bomb and scared em off. After that we always had a few ready to go, all they needed was water.
Mr.Asmith9 (author) 7 years ago
Well this is my First Instruct able.. so Have fun with it.. Note: Some times its louder then others an also it doesn't always split from down the side like it did in this picture... sometimes it just blows the cap off.. Try new stuff... For example.. Tie a strong string or cord around the cap area.. and once you have done that tie the other end of the string or cord to a rock, just make sure its a good size rock. because the more gas that it releases the lighter it gets. so the more buoyant it will become... Then you slowly put it into the water sit back an watch.. if nothing ells u will know it went off if u see a bunch of bubbles float to the top of the water.. Well if anyone tries this.. let me know how it works an what not.. sounds like fun. let me know if u discover other uses with this. Just try using different liquids an other ingredients as well, like hot sauce.. Enjoy!
Ian017 years ago
Step 2: First step 3: Secent Step 4: Step 3 lol:)
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