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HDPE vs. PVC Why does it have to be HDPE?
One of the more dangerous misconceptions when it comes to consumer fireworks is that you can use PVC to launch mortar shells. A lot of people will come into the store and look at the extra mortars that we have for sale and say well I can just use PVC. Time and time again I explain the hazards of this misconception, hopefully this will clear thing up.
The first differences between HDPE and PVC is that the inside diameter of the HDPE is 1.82" this is the necessary diameter to get the aerial shells to their proper height. With the PVC the inside diameter is exactly 2". Even though the difference is only .18" the gases that escape through the space will not give as much lift. This would cause the shell to break low when compared to a shell launched out of the correct sized mortar.
The next difference between HDPE and PVC is what would happen if for some reason a mortar shell did not leave the mortar and break inside the mortar. With the PVC mortar the shell would shatter the pipe into tiny pieces of shrapnel. If you have ever seen what happens when you drop a crystal glass you will get the same effect. Remember with the glass dropping it just shatters on the floor there was no inner force. With a PVC mortar the shattering force comes from within, sending the shrapnel flying out all over.
A lot of firework dealers sell extra pipes and racks. Even though these mortars and mortar racks will cost a little more than just going out and buy a 8ft. length of PVC, is the cost really worth the risk of injuring yourself or someone you love. I don't think so, please stay away from using PVC for mortars and stick to what the professionals use and that is Cardboard, HDPE, Fiberglass, or Steel.