dave321 Posted March 11, 2013 Share Posted March 11, 2013 not sure if this belongs in the HE section, if so please move am i right in thinking most concussion compositions for use in a concussion mortar are based on magnesium /strontium nitrate ? or is 70/30 also used ?............is this more "explosive / noisy" than the above magnesium comp? any reason the following comp could not be used as it is based on a reformulated military simulator mix ? strontium nitrate 53.5aluminium 40sulphur 5 reduces ignition temp.boric acid 1 counters potential nitrate aluminium reactioncabosil 0.5 these compositions are design for noise not light. i am aware that each manufacturer marries their composition for use in their own mortar for safety reasons on a seperate note maybe the forum needs another section specifically for theatrical/stage /spfx pyro ? dave Link to comment Share on other sites More sharing options...
bikemaster Posted March 11, 2013 Share Posted March 11, 2013 I use a lot of "Le maitre" and "NextFx" concussion type flash powder.I am pretty sure they use the 70:30 we all know, using potassium perchlorate and aluminium flake or magnalium.The composition you just show content sulphur... this is not really good if you are doing a show in a theater and it start smeling SO2 after each concussion. Link to comment Share on other sites More sharing options...
Mumbles Posted March 11, 2013 Share Posted March 11, 2013 They generally come as 2 part mixes. I'd imagine shipping would be a pain otherwise. They're generally formulated so that they can be mixed by volume. I also believe they're a bit more tame than straight 70:30 with black Al, but that might just come from fillers/blends of materials needed to get equal volume compositions. Link to comment Share on other sites More sharing options...
dave321 Posted March 12, 2013 Author Share Posted March 12, 2013 using 0.5g of each :- std 70/30 gives a small thud unconfined whereas strontium nitrate 53.5aluminium 40sulphur 5 reduces ignition temp.boric acid 1 counters potential nitrate aluminium reactioncabosil 0.5 flow agent is fast but gives no "thud" when unconfined, quite a "soft" flash.larger amounts and confined, is of course another matter, i am sure it would perform as it were. dave Link to comment Share on other sites More sharing options...
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