Arthur Posted April 10, 2009 Posted April 10, 2009 I'm looking at making some heart shells and I'm looking for slow burning compounds so that I can have small stars that still have a reaonable burn time. 20+ stars in a heart shape in a 4inch hemi with a burn time of more than two seconds needs a star about 6mm, 6mm and two seconds is quite slow. Also can I have red, blue, gold .........
Miech Posted April 10, 2009 Posted April 10, 2009 Let me look it up in my database. 65 Barium/Strontium Nitrate10 Aluminium Powder (-325# flake, finer is better)20 Parlon04 Sulfur02 Boric Acid Bind preferabely with NC laquer. I wrote a note under this composition saying it is nearly impossible to ignite without step priming or using a silicon prime. This star gives a very bright deep color, similar to emerald and ruby colored stars. I noticed some tail when made with paint grade aluminium, but for ignitability reasons I would recommend making it with something more reactive like dark flake.
qwezxc12 Posted April 10, 2009 Posted April 10, 2009 I find that colors that use Ammonium Perchlorate as an oxidizer burn slower that those that use KP. David Bleser's AP Blue #20 might be a good starting point for making slow burn-rate color stars: Ammonium Perchlorate..........68 Hexamine............................17 Copper(II) Oxychloride..........11 Dextrin.................................4 I've not settled on a standard formula, but I typically bring the coloring agent (metal oxides or carbonates) to 15% and add a few % of additional chlorine donor (Saran usually); they slow the combustion even more while deepening the color, at a slight expense of light output. I use these as color cores to roll streamers over...Reaper Silver's a good and east one.
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