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Great Burst Disc Material (for those interested)

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Great Burst Disc Material (for those interested)

Unread postAuthor: noname » Tue Aug 18, 2009 1:11 pm

I was shooting last night with a friend, using my little burst disc mortar, and we ran out of burst disc material. However, there's a big pile of junk outside my house which includes a semi-shredded window shade. So I grabbed it and cut some discs out of it.
The shade I was using had little tiny ridges and lines in it, so it didn't seal perfectly, but that can be fixed by adding one layer of foil or plastic shopping bag behind it.
One layer of widow shade (plus one of shopping bag) held up to 80 psi in a 1" union. I got the window shade at Wal-Mart for around $15, which is a little pricey at first, but not when you think about it. One disc is 3" x 3" and the shade is around 5-6 feet by 4 feet. 16 discs per square foot times around 20 square feet equals a lot of burst discs, especially if you're just going to throw the shade away anyway.
Pretty much any vinyl shade should work fine, <a href="http://i.ehow.com/images/GlobalPhoto/Articles/5103248/shade1_Full.jpg">here</a> is just a basic example of one that would work great.

Also, window shades have that roll-up feature, powered by springs. You can pull apart the whole tube and find some goodies in there.
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Unread postAuthor: Hotwired » Tue Aug 18, 2009 7:33 pm

It's a good wheeze really.

Any kind of substantial fabric would be good.

Under heavy loading in a burst disk it would rip away catastrophically with no hard shrapnel risks.

I may kidnap this thought and test it for my own purposes.

For extra simplicity something like a tarpaulin would be ideal, the heavy fabric with its waterproofing should take quite a bit of loading from gases too with suitable sealing.

The number of burst disks you could get from several square metres of tarp and no tinsnips needed *_*
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Unread postAuthor: noname » Tue Aug 18, 2009 11:11 pm

I'm not sure how well a tarp would burst out under pressure; they seem like the kind of material which instead would tear. I think they might be too fibrous. But that's just a guess, I could be totally wrong. And tarps in Europe could very well be made of a different material or in a different way.
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