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Burst disk material

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Burst disk material

Unread postAuthor: sergeantspud2 » Mon Apr 07, 2008 1:04 pm

I looked in the wiki... and searched the forum and couldnt find info on burst disk material.

I have a hybrid very near to completion just need to fool proof the ignition system and trouble shoot a few ignition kinks... anyways I have a 1 1/4 steel union and i was trying to think of some burst disk material. Some I know are:

1.milk jug plastic
2. foil
3. ...? cant think of any more

I used foil in my test and it seemed like a lot of hassle with 16 sheets of foil it was hard to keep them all in line.

I found that foil bursts at around 5psi per sheet, roughly how much does a milk jug rupture at?

Thanks guys
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Unread postAuthor: Jared Haehnel » Mon Apr 07, 2008 1:18 pm

I've said it a few times but I don't know if any one has tried them but roofing tins seem like they would make a good burst disk...you can pick them up at most hardware stores and the are thin gauge galvanized steel. Usually sold by the pound...
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Unread postAuthor: jrrdw » Mon Apr 07, 2008 1:27 pm

Tuperware lids, aluminum cans thats all I got.
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Unread postAuthor: sniper hero » Mon Apr 07, 2008 1:27 pm

I never used burst disks but I read somewhere on the forum that innertire of a bikes works good and has a burst pressure from 150 psi
just try to help so if I'm (he) is wrong dom't blame me
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Unread postAuthor: potatoflinger » Mon Apr 07, 2008 1:28 pm

Pretty much anything that you can find that will fit in your union will make a good burst disc material.

Edit: I was the one who said that bike inner tubes work well, but when I said that they burst at 150 PSI, I was using a 1/2" union, so if you use them in a 1 1/4" union, they will burst at a lot lower pressure.
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Unread postAuthor: sergeantspud2 » Tue Apr 08, 2008 12:45 pm

Aluminum cans might be good I tried that the other day to pressure test the chamber

Any guesses as to what the burst pressure would be?
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Unread postAuthor: shiftyguy » Wed Apr 09, 2008 8:55 am

I was going to use "crazzy carpet" you can pick them up for about 5 bucks and you could cut a couple hundered from one.
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Unread postAuthor: pat123 » Wed Apr 09, 2008 9:21 am

I made a post the other day but the plastic that toys and stuff come in bursts at about 180 psi in a half in union
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Unread postAuthor: jrrdw » Wed Apr 09, 2008 9:22 am

I think it was said 1 layer of aluminium can is good for 150ish psi, don't quote me, I may be wrong. If memory serves me correctly, layering increases the breaking point for each layer. Again, don't quote me.
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Unread postAuthor: biggsauce » Wed Apr 09, 2008 9:28 am

A tad more expensive, but I used to hear some hybrid guys use different thickness/layers of neoprene. I don't remember the pressures though...
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Unread postAuthor: bigbob12345 » Wed Apr 09, 2008 9:33 am

No matter what I do I always end up going back to aluminum foil.
I would reccomend to just stop looking for new burst disk ideas because you are going to just end up going back to aluminum foil as i did.

I realize this post will most likely be ignored but im just sharing my thoughts.
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Unread postAuthor: jrrdw » Wed Apr 09, 2008 10:12 am

bigbob12345 wrote:No matter what I do I always end up going back to aluminum foil.
I would reccomend to just stop looking for new burst disk ideas because you are going to just end up going back to aluminum foil as i did.

I realize this post will most likely be ignored but im just sharing my thoughts.


What else have you used? It mite help sergeantspud2 to list what you've tryed. I'm wondering for myself also.
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Unread postAuthor: SpudFarm » Wed Apr 09, 2008 10:59 am

chip bag plastic, soda cans, neoprene, aluminium foil, duck tape, wood that is what i can remember i have used in a 1" hybrid union.

i don't know about my 2" union tho. has to be really thick at 10x
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Unread postAuthor: sergeantspud2 » Fri Apr 11, 2008 1:02 pm

Yep I agree with that aluminum foil is easy and I can figure out how many sheets I need very quickly.


Im also going to try milk jugs

I dont know about soda cans though becuase I just think its kind of thick
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:D Always rely on Murphy's Laws :D
4.If you have enough grease & a big enough hammer, you can put anything... anywhere
3.If all else fails, hit it with a big hammer
2.Matter will be damaged in direct proportion to its value
1.If anything simply cannot go wrong, it will anyway
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Unread postAuthor: Jared Haehnel » Fri Apr 11, 2008 1:05 pm

I dont know about soda cans though becuase I just think its kind of thick


....Bah!.... they'll burst just fine...I couldn't tell you at what PSI though... I don't imagine more then 250 psi
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Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
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C02 tank hybrid
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