Zumber Posted September 13, 2010 Posted September 13, 2010 White star- Hey guys these star burns pretty white in colour without leaving tail. Sodium Nitrate........6 barium nitrate........2 sulphur.........2-1/4 charcoal(air).....1/2 mg(fine)......1 mg(coarse).....1 1
Ralph Posted September 13, 2010 Posted September 13, 2010 uncoated magnesium and nitrates (especially ones like sodium) are known for their spontaneous ignition I hope your using coated magnesium
Zumber Posted September 15, 2010 Author Posted September 15, 2010 uncoated magnesium and nitrates (especially ones like sodium) are known for their spontaneous ignition I hope your using coated magnesium Obviously I use coated Mg 1
Ralph Posted September 15, 2010 Posted September 15, 2010 it wasn't obvious and it is your responsibility to alert possible users of your formula to the extreme dangers if they follow it as it is set out
Arte valdo Posted September 15, 2010 Posted September 15, 2010 This composition I used: and it very good for me, easy to roll: White star #1Potasium nitrate...........................................57Sulfur.....................................................23Black powder...............................................20Dextrin....................................................+4
Zumber Posted September 15, 2010 Author Posted September 15, 2010 it wasn't obvious and it is your responsibility to alert possible users of your formula to the extreme dangers if they follow it as it is set outnote-all part by weight.Sodium nitrate.....6Barium Nitrate......2sulphur.....2-1/4Charcoal(air).....1/2Mg(fine,coated)......1Mg(coarse,coated).....1 1
Karlos Posted September 16, 2010 Posted September 16, 2010 White metal fuelled compositions are usually designed without sulphur. Sodium nitrate give yellow colour to flame and in the white formula isn´t important. Where is binder? Insufficient formula.
pillyg Posted March 5, 2011 Posted March 5, 2011 This composition I used: and it very good for me, easy to roll: White star #1Potasium nitrate...........................................57Sulfur.....................................................23Black powder...............................................20Dextrin....................................................+4 What can I use as a prime? I tried BP but it didnt work too well.
dagabu Posted March 5, 2011 Posted March 5, 2011 Try a pinch of silicon metal in the prime, it helps get lower fuel comps going.
pillyg Posted March 5, 2011 Posted March 5, 2011 (edited) Try a pinch of silicon metal in the prime, it helps get lower fuel comps going. Hum. Don't have any. Could I add some Ti or Al instead? Edited March 5, 2011 by pillyg
dagabu Posted March 5, 2011 Posted March 5, 2011 Nope, they will not do the same thing. The silicon turns to tiny molten glass and helps ignite hard to light comps. The metals all burn away.
pillyg Posted March 5, 2011 Posted March 5, 2011 I just ignited some with my SUPER slow KNO3/Al/S flash. I dont think that would be a good prime though.
dagabu Posted March 5, 2011 Posted March 5, 2011 Sure, why not? Use BP over the top of the slo-flash. Make a small mine and see how it does or better yet, shoot some from a star gun.
pillyg Posted March 5, 2011 Posted March 5, 2011 Hum. Ok I will try that. I just remember hearing that KNO3/Al was unstable and that water+Al=bad but if you say its ok, I believe you
dagabu Posted March 5, 2011 Posted March 5, 2011 Treat the aluminum with boric acid first, that will keep the reaction down.
Arte valdo Posted March 6, 2011 Posted March 6, 2011 What can I use as a prime? I tried BP but it didnt work too well.I have no problem with these star, prime with BP (milled 15min) catch fire very easily.. By the way, this composition of star I also milled about 30min.. that's why so easy it light
pillyg Posted March 8, 2011 Posted March 8, 2011 Ok. I finally got to work but it seemed like I used a lot of prime.
dagabu Posted March 9, 2011 Posted March 9, 2011 They are probably not dry yet. KNO3 and dextrin comps can take quite a while to dry out. I am on week three for a batch of stars I made and year two on a batch of TT that I made in 2009.
pillyg Posted March 9, 2011 Posted March 9, 2011 Haha thats a lot. I tried a desecator bag but it didnt really work. I had calcium chloride
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