High Powered Rocket High Altitude Ejection Charge Test Part 1
Under low pressure, black powder charges are known to fail. While black powder contains its own oxidizer, air acts as a heat transfer mechanism that causes the chain reaction to occur and all black powder to ignite. Under low pressure, there is a lack of air.
To mitigate this and to maintain air pressure, the charge must be placed in a sealed container. It is important to note that you should not seal your container with anything hard like epoxy, as it will become a projectile! Use silicone rubber or equivalent.
Remember, observe local, state, and federal laws when attempting such a test. Additionally, perform your test with proper distance and safety gear.
Part 2 of this video can be viewed here: https://www.youtube.com/watch?v=3MbVbwUsv6g