Chandan123 Posted March 3 Share Posted March 3 Can any one have loud crackle formula of lead tetraoxide/minium. Link to comment Share on other sites More sharing options...
Zumber Posted March 3 Share Posted March 3 (edited) But Lead tetraoxide is extremely toxic. You must not touch it with bare hand and dont allow it to be inhaled. Use respirator and wear gloves while working. Crackling stars are extremely dangerous you must not use fine mesh screen to sieve it, be sure that red lead and cupric oxide is 100 mesh plus fine. Individually screen read lead and keep it aside ,then sieve cupric oxide and keep it aside, then weight formula and mix it using normal mesh screen say 40 mesh is enough. Sieve three times and aware of friction and impact while working. Crackling star. Read lead 4.000 kg Black cupic oxide 1.000 kg 200 mesh coated magnelium 1.000 kg Magnelium is 50:50 and coated. Uncoated magnelium create problem. Edited March 3 by Zumber Link to comment Share on other sites More sharing options...
Chandan123 Posted March 3 Author Share Posted March 3 (edited) I tried th above composition but it does not sound that much, i think sound comes from more magnalium. Edited March 3 by Chandan123 Link to comment Share on other sites More sharing options...
Zumber Posted March 3 Share Posted March 3 How do you process crackling? What standard is your NC? Is your Read lead pure? Link to comment Share on other sites More sharing options...
CHNO Posted March 4 Share Posted March 4 (edited) Best of AFN3: Pb3O4: 81.8% CuO: 9.1% AlMg: 9.1% + 10% NC laquer My calculated Formula: 0.5 Pb3O4: 50.1% 3 CuO: 34.9% 2 AlMg: 15.0% Edited March 4 by CHNO 1 Link to comment Share on other sites More sharing options...
Zumber Posted March 4 Share Posted March 4 Thank you Link to comment Share on other sites More sharing options...
Chandan123 Posted March 9 Author Share Posted March 9 i use duco clear NC laquer. Link to comment Share on other sites More sharing options...
Zumber Posted March 9 Share Posted March 9 Give out a try to the formula posted above, I have used it and it works just fine for me. Link to comment Share on other sites More sharing options...
Chandan123 Posted March 10 Author Share Posted March 10 I already tried that formula it is fine for fountain and small shot but not for shell. how much NC you use? Link to comment Share on other sites More sharing options...
Zumber Posted March 10 Share Posted March 10 There is no such amount. I wet mixture and knead it well to form dough ball consistency and then I pass it through 20 mesh screen and roll it till i get 1 to 2 mm cores and dry it out in a shadow for a day and then in sun for 2 hours. Its tricky In order to work it in a shell. It depends on how you process, what prime you prefer and how much heat your prime generates to ignite core. Link to comment Share on other sites More sharing options...
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