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Does black powder require compression to explode?
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Yes, no, sort of. Let's see if I remember this correctly.
It requires confinement. If you pour a big pile of powder on the ground it just burns. If you take a blowtorch to a can of powder (not recommended) then it explodes but the initial burning of the powder creates a lot of gases which compresses the remaining unburnt powder which then lets it explode.Frank
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I'm using it for high power rocketry. It's the only powder that does not have to be tightly enclosed to blow off a body tube or nose cone to deploy a parachute. The stuff works great!!!Beware of the growing Police State!Comment
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It's been awhile but from what I remember:
compressed = propellent
loose = explosive
this is in regard to being in a chamber or barrell, otherwise your mileage may vary. Best to do a little research specific to your application.
Also BP substitutes (Pyrodex etc) all act differently so be sure of your powder, measurements, and application.Pokey
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