Pyrophoric30 Posted June 6 Posted June 6 Good day pyros! I need help in my green star composition. Why does it emit yellowish flame with the hint of green. Here is my composition. barium nitrate - 55 aluminum - 15 Pvc powder - 20 sulfur - 5 Dextrin - 5 I think it was the pvc that causes the yellow flame or do i have to test it in star form rather than powdered form. Does it make any difference?
Zumber Posted June 6 Posted June 6 Star with aluminium fuel generally turns yellowish green. Pvc seems a bit high causing to burn star a bit difficult and slower. Try reducing chlorine donor upto 13 to 15 percent and use 200 mesh magnelium as a fuel instead if aluminium. Try to replace few percentage of pvc with parlon.
Pyrophoric30 Posted June 6 Author Posted June 6 Wow man. I cant believe that just dropping chlorine donor to just 15% made a big difference. It doesnt produce yellowish flame like before but the green runs out quickly.
Zumber Posted June 6 Posted June 6 No its just reduced for ease of ignition and sped control of star.....if you are using parlon as a chlorine donor you can use it more but pvc makes star to burn slow.....plus magnelium is good fuel for star than aluminium......if you increase chlorine donor reduce magnelium and if you increase magnelium reduce chlorine donor. Magnelium- from 12 to 25 Parlon-from -25 to 12 Keep other things unchanged.....use parlon insted of pvc usemagneloum insted of aluminium.
Pyrophoric30 Posted June 6 Author Posted June 6 37 minutes ago, Zumber said: No its just reduced for ease of ignition and sped control of star.....if you are using parlon as a chlorine donor you can use it more but pvc makes star to burn slow.....plus magnelium is good fuel for star than aluminium......if you increase chlorine donor reduce magnelium and if you increase magnelium reduce chlorine donor. Magnelium- from 12 to 25 Parlon-from -25 to 12 Keep other things unchanged.....use parlon insted of pvc usemagneloum insted of aluminium. Thanks! Appreciated. I cant get my hands on magnalium and parlon thats why i use aluminum and pvc. Also, what prime can be used in colored star without silicon or magnalium. Will this composition work. bp+10%aluminium+2%fe2o3
Zumber Posted June 6 Posted June 6 I dont like aluminium in prime it burns too fast and it also leave small tail behind star if it is added in prime. Kindly order magnelium. Try to use slow BP ( more charcoal in formulation) plus 10 percent barium nitrate in it followed by 10 percent metal (magnelium works very well) and 5 percent dextrin as a binder. Apply standard unmilled bp at final stage. Right now you can try out aluminium but be aware of nitrate aluminium reaction. Use 1 to 2 percent boric acid everytime when you use aluminium and nitrate together in any formula.
Pyrophoric30 Posted June 6 Author Posted June 6 Thanks mate! I will try to get some magnalium first. I wasnt able to have a good red using aluminum. Must be magnalium right? 39 minutes ago, Zumber said: Try to use slow BP ( more charcoal in formulation) plus 10 percent barium nitrate in it followed by 10 percent metal (magnelium works very well) and 5 percent dextrin as a binder. So it must be a slow bp plus barium and metal. Will aluminum work for the mean time because it will take me some time to source out a supplier for magnalium. thanks for the reminder in using boric acid, i usually use 2% boric acid when dealing with aluminum in stars.
Zumber Posted June 6 Posted June 6 8 minutes ago, Pyrophoric30 said: Thanks mate! I will try to get some magnalium first. I wasnt able to have a good red using aluminum. Must be magnalium right? So it must be a slow bp plus barium and metal. Will aluminum work for the mean time because it will take me some time to source out a supplier for magnalium. thanks for the reminder in using boric acid, i usually use 2% boric acid when dealing with aluminum in stars. My red green uses same formula, I replace barium nitrate with strontium for my red and vice versa. Yes magnelium is best all time for me. You try using aluminium in prime it will give some short tail behind star. 1
MADBOY Posted June 6 Posted June 6 11 hours ago, Pyrophoric30 said: Good day pyros! I need help in my green star composition. Why does it emit yellowish flame with the hint of green. Here is my composition. barium nitrate - 55 aluminum - 15 Pvc powder - 20 sulfur - 5 Dextrin - 5 I think it was the pvc that causes the yellow flame or do i have to test it in star form rather than powdered form. Does it make any difference? barium nitrate - 80 Mgal 20 Pvc powder - 20 sulfur - 10 Dextrin - 6 Use it I think it is good for you
Mumbles Posted June 6 Posted June 6 Testing star formulas bound vs. powder does make a difference. A bound star burns only on the surface, which gives a better representation of how it will perform. Powders tend to have much higher surface areas, and the effect or color can be different than what the final star will be. It is fine as a quick check, but I wouldn't make decisions based on a powder burn test alone. 1
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