HDPE is the safest material to use for making firework mortars. It is tough, and can take a lot of abuse and firings, and can last a lifetime. If a fireworks shell explodes in an HDPE mortar, there are few, if any, sharp-edged pieces of shrapnel to injure people. That's because HDPE doesn't shatter--it shreds and tears. ManM Fireworks mortar tubes are plugged with a 2 inch thick wooden plug.
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