Fireworks.org – The World’s Fireworks Community › Forums › Pyro Technology › Any tips on getting a cleaner break on 4 inch shells?

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  • Steve Kline
    Participant
    June 21, 2026 at 10:59 pm
    Post count: 1
    #5478

    I’ve been working on 4″ canister shells and I keep getting uneven breaks. Using BP lift and rice hulls for the break charge, but the pattern’s never as round as I’d like.

    Anyone have tips on getting that perfect symmetrical break? Timing? Amount of flash? Would really appreciate any advice.

    Mike Brenner
    Participant
    June 21, 2026 at 11:00 pm
    Post count: 5
    #5490

    Check your pasting consistency first. Uneven paste layers can cause weak spots that blow out before the rest of the shell. Also make sure your spiking is even. I had the same problem until I started being more careful about symmetrical spiking.

    Ron Butler
    Participant
    June 21, 2026 at 11:00 pm
    Post count: 3
    #5493

    What’s your burst charge composition? I’ve found that switching to a 70/30 KP/AL mix gave me noticeably cleaner breaks compared to straight BP. Less smoke, more pop. Takes some fine tuning but worth the effort.

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