Energetic Materials High Explosives Other Explosives Pyrotechnics and Propellants

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1. Semi liquid propellant "ANA" (1 replies)
2. > Processing an unknown fertilizer/oxidizer (4 replies)
3. Firecracker- "Double-Voiced" (5 replies)
4. Military and Civilian Pyrotechnics (1 replies)
5. Paris Green (7 replies)
6. Exploding Target Composition (1 replies)
7. RDX as a propellant (sprint missile derivated) (12 replies)
8. Mortar Shell Function (11 replies)
9. Explosives Recycling/Deactivation (4 replies)
10. Improving a thermite reaction (4 replies)
11. Strength of several pyrotechnic (and HE) comps (13 replies)
12. Electronic Detonators/Ignitors (24 replies)
13. ATFE license in PA (5 replies)
14. Visco Fuse Machine! =D (20 replies)
15. Survivorman campfire tip (19 replies)
16. Powdered Aluminum (57 replies)
17. KNO3 Australia (2 replies)
18. Fe3O4 vs iron filings (11 replies)
19. First attempts at KNO3 and sugar rockets. (9 replies)
20. Another good way to make BP (35 replies)
21. CPSC Visits Skylighter (19 replies)
22. Home fireworks manufacture causes explosion (6 replies)
23. Hemp Charcoal Testing (4 replies)
24. Compare KClO3 and KMnO4 (43 replies)
25. Black Powder Salutes & Pyrotechnic Tubes (40 replies)
26. Flash (4 replies)
27. Amateur Rocket (4 replies)
28. Troubleshooting Black Powder Production (30 replies)
29. How safety about KCLO4 (4 replies)
30. Fun bicolor FX with Zinc/Mg (1 replies)
31. Elemental Carbon for Black Powder???? (3 replies)
32. Remarks, Questions, and Theories on a Couple of Things (9 replies)
33. KAMURO. How to make this secret formula...? (3 replies)
34. Incendiary Salute w/ videos (4 replies)
35. Flash mix question (8 replies)
36. Magnesium Thermite (24 replies)
37. Bit of confusion with BP and Flash powder (5 replies)
38. Flame-less Ignition Composition ? (1 replies)
39. Malleable Solid Rocket Propellant (12 replies)
40. Colored Flash (26 replies)
41. Fun With Sulfur (11 replies)
42. Cab-O-Sil as an additive (2 replies)
43. Chlorate/sucrose powders sensitivity (23 replies)
44. Great Resource for the manufacture of rockets, motors, and KN/SU fuel. (3 replies)
45. Reliable ignition of confined thermite (38 replies)
46. 1945 War Time Potassium Chlorate Work-around (2 replies)
47. WTF is this shit? (Strange composition) (8 replies)
48. Zinc + Sulphur + Heat ------> anygood? (26 replies)
49. CPSC vs Firefox Case: "Urgent Update" (98 replies)
50. How to make your own *reliable* E-matches (13 replies)
51. Enhancing the tail of the BP rocket (11 replies)
52. Linear Thermite Cutting Charges (4 replies)
53. Cartridge primer, in need of a simple impact explosive (7 replies)
54. Pyro Tube capping Tool (8 replies)
55. Cordite (Balistite) Propellant VS SRB Propellant (6 replies)
56. PK-Unlimited Aluminum Powder (14 replies)
57. NaClo3/Sugar Stars (19 replies)
58. MAGNALIUM vs Pyro Aluminum (22 replies)
59. Rocket engines for usable BP? (21 replies)
60. Whats wrong with my BP (21 replies)
61. Reactive target experiments!! :) (5 replies)
62. Kno3 (26 replies)
63. Is KMnO4 good as KClO4? (3 replies)
64. Air burning-figures (3 replies)
65. Pyrotechnic delay detonator (12 replies)
66. Is 96/4% AL/Shellac any good? (5 replies)
67. Ground Salute Question (10 replies)
68. bad flash (24 replies)
69. smoke bomb trouble shooting (34 replies)
70. Uses for aluminum oxide/nickel oxide- fuel cell catalyst???? (3 replies)
71.
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71. Safe Environment for flash power creation. (10 replies)
72. slow burning brick formula? (7 replies)
73. Problem with flash powder (51 replies)
74. Pyro supplier busted by feds (7 replies)
75. I made flash powder, not thermite? (15 replies)
76. Why do we always use German Dark Aluminum? (48 replies)
77. barium sulphate flash powder (23 replies)
78. Homemade fuse (54 replies)
79. Question on mixing flash safely and shelf life (32 replies)
80. Thermite Incendiary Fountain; A Hot Idea! (16 replies)
81. propane cylinder high flow discharge unit (15 replies)
82. Thermite wont ignite (9 replies)
83. faster reaction on solid buyproduct comps (2 replies)
84. Stoichiometry and optimum ratio of reactants (9 replies)
85. CCl4 substitue? (8 replies)
86. Lighting the fuse! (39 replies)
87. Ammonium Nitrate (AN) Based flashpowders (12 replies)
88. Yet Another Black powder vs. Flash Powder (12 replies)
89. Hydraulic Jack Pressure (6 replies)
90. Round Shell Making (31 replies)
91. Double Petal Round Shell Making (5 replies)
92. Pharaoh Snake (5 replies)
93. Smoke compounds in the military. (16 replies)
94. blackpowder (17 replies)
95. Dragon Eggs: CuO and Al/Mg (30 replies)
96. Blackmatch (34 replies)
97. CaSO4 and other cheap oxidizers (20 replies)
98. Glow powder in shell (18 replies)
99. Shooting Fireworks: Capture The Spectacle (3 replies)
100. Illumination Rounds (58 replies)
101. Corn Flour as a binder (34 replies)
102. Prime Compositions and Techniques (8 replies)
103. flash powder / firecrackers (2 replies)
104. whoops (5 replies)
105. o (2 replies)
106. Chemical Seperation (8 replies)
107. Using Antimony Sulfide in flash? (21 replies)
108. PVC endplugs (23 replies)
109. Flash with Atomized Alu (2 replies)
110. Use for AN in pyro (27 replies)
111. newspaper charcoal for BP (56 replies)
112. Reloadable, arc-fused mine. (3 replies)
113. Melting BP - Well, sort of... (7 replies)
114. economical flash. (22 replies)
115. KN03/S/Al Flashpowder (33 replies)
116. Using ordinary junk... (3 replies)
117. Giant fountain (20 replies)
118. a question on airbags (31 replies)
119. make pyrodex BP more powerful? (19 replies)
120. making torpedoes (impact sensitive fireworks) (43 replies)
121. black powder info/help (21 replies)
122. Flashbang (sans bang) (19 replies)
123. good old flash powder (41 replies)
124. useful blue deflagrating mixture (7 replies)
125. visco fuse alternative = luc's fuse (33 replies)
126. Substitution of different nitrates in blackpowder/liftpowder; an experiment (7 replies)
127. Inconsistent fuel burning with BP (9 replies)
128. Commercial Smoke Composition (139 replies)
129. sulfurless blackpowder (24 replies)
130. Success with rockets!! :D - what worked for me. (46 replies)
131. coreographing fireworks display-urgent (3 replies)
132. Improving Whistle Powder for use as Flash Powder? (42 replies)
133. Flash Not Green! (88 replies)
134. glucose - Archive File (0 replies)
135. trip flares - Archive File (1 replies)
136. Problem with Flash Powder - Archive File (0 replies)
137. eal Coated Rice Hulls - Archive File (0 replies)
138. alcohol rocket - Archive File (0 replies)
139. pyrotechnic training/courses - Archive File (0 replies)
140. multi color AN smokebombs? - Archive File (9 replies)
141. greek fire - Archive File (2 replies)
142. NaNO3 vs KNO3 - Archive File (0 replies)
143. Friction ignition - Archive File (0 replies)
144. flash powder - Archive File (0 replies)
145. Thermite reaction - Archive File (0 replies)
146. New Homemade Fuze - Archive File (38 replies)
147. Misjudged power of hydrogen! - Archive File (24 replies)
148.
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148. Smoke experiments... - Archive File (6 replies)
149. Flash Filler (12 replies)
150. AN smoke paper - Archive File (1 replies)
151. Make Charcoal. (58 replies)
152. What brand to buy? - Archive File (0 replies)
153. Smoke Grenade manufaturer (United States) - Archive File (6 replies)
154. Improved creatermaker! - Archive File (3 replies)
155. Berger's mixture - Archive File (0 replies)
156. igniting naphthalene - Archive File (0 replies)
157. A quick question about Armstrong's mixture. - Archive File (0 replies)
158. Kclo3 + Mg powder - Archive File (1 replies)
159. Rocket explosives - Archive File (0 replies)
160. Rocket Fuel - Archive File (3 replies)
161. Snake explosive? - Archive File (0 replies)
162. thermite - Archive File (78 replies)
163. soap or styrofoam??? - Archive File (0 replies)
164. extraction of K out of KNO3? (4 replies)
165. Chlorate Flash (36 replies)
166. AN + charcoal - Archive File (11 replies)
167. Teflon as an oxidizer? - Archive File (4 replies)
168. AN smoke bombs - Archive File (0 replies)
169. Boric Acid - Archive File (14 replies)
170. purifying sulphur (40 replies)
171. Simple Black Smoke - Archive File (0 replies)
172. Flash powder/m-80's - Archive File (27 replies)
173. Flash Paper - Archive File (0 replies)
174. Best way of getting BP into cratermakers? - Archive File (0 replies)
175. Permagnate Flash - Archive File (13 replies)
176. The subject of thermite - Archive File (0 replies)
177. This might make paint grade Al into useful flash Al - Archive File (0 replies)
178. Ideal gas mixture - Archive File (0 replies)
179. A catalyst (17 replies)
180. Flame colors (119 replies)
181. Interesting grenade idea... (4 replies)
182. re-usable roman candle? - Archive File (1 replies)
183. Proper Pyro (82 replies)
184. Question about KNO3/Sugar smoke bombs. - Archive File (0 replies)
185. Flash bombs - Archive File (0 replies)
186. Smoke bombs - Archive File (17 replies)
187. Kno3/Suger accident - Archive File (0 replies)
188. lightingThermite - Archive File (3 replies)
189. Whistle powder accident (15 replies)
190. Chemical Smokes (34 replies)
191. Rocket casings, are they thick enough? (5 replies)
192. May 31 will be the end of easily acquired pyrotechnics and fuse in the US. (51 replies)
193. strange deflagration (2 replies)
194. Use of Silicone Rubber in Rocket Propellants (6 replies)
195. Multi engine - multi stage model rocket (0 replies)
196. Hot Cast Fuel Grains (12 replies)
197. Road Flare Comp? - Archive File (18 replies)
198. Napthalene Canon Problem - Archive File (2 replies)
199. Fuses: Red, Green...diferences besides color? - Archive File (13 replies)
200. Kno3 / Phosphorus smoke grenade - Archive File (0 replies)
201. Salt Nitrate colours - Archive File (0 replies)
202. re (1 replies)
203. Whats better wood alchohol or Isopropyl alchohol? - Archive file (1 replies)
204. Rocket fuel - Archive file (32 replies)
205. info about KMn04 Flashpowder? - Archive file (0 replies)
206. Homemade Flashbang (Def-Tec No. 25) - Archive file (1 replies)
207. Potasium perchlorate lift charge? (7 replies)
208. one order, or two? (8 replies)
209. A Few Simple ? - Archive file (0 replies)
210. Christmas Cracker composition (6 replies)
211. Liquid-fuel fireballs (34 replies)
212. Flash paper (5 replies)
213. Useful material for rockets/salutes? (9 replies)
214. Favorite flash powder? - Archive file (21 replies)
215. Rocket Cores (21 replies)
216. Nitrocellulose Rocket Fuel (12 replies)
217. BP (meal) problem (85 replies)
218. What to do with Graphite ? (32 replies)
219. KMnO4/Al/S - IMPORTANT WARNING (21 replies)
220. Zn/S Rockets (17 replies)
221. Polyester Resin Rocket Fuel (9 replies)
222. Edible Rocket Car Completed (8 replies)
223. Mr Cool (11 replies)
224. Rakete (7 replies)
225.
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225. Spin Stabilised Model Rockets (113 replies)
226. what is the blue substance? (10 replies)
227. Improvised Salute Casings (14 replies)
228. Whats better wood alchohol or Isopropyl alchohol for making black powder? - Archive f (2 replies)
229. Making sparklers - Archive Post (0 replies)
230. Metal Powders Wanted (14 replies)
231. what burns a very pretty red (8 replies)
232. The KGB FIles (23 replies)
233. Exotic Thermites? (66 replies)
234. Rocketry Competition - help wanted (26 replies)
235. Substituting Amonium Nitrate for Potasium Nitrate -Archive File (6 replies)
236. Consolidated Thermite Compositions (3 replies)
237. Military Smoke Device (55 replies)
238. Thermite and Magnets (25 replies)
239. Sulferless Black Powder (80 replies)
240. Effective and inexpensive smoke device. (90 replies)
241. Benzolift? (5 replies)
242. KNO3 (3 replies)
243. Flash powder & Castable Plaster Incendiaries (107 replies)
244. I built something unusual today (6 replies)
245. Match rockets? (59 replies)
246. triangles (3 replies)
247. optimum triangle crackers (57 replies)
248. 50/50 potassium perchlorate &powdered aluminum (6 replies)
249. Where to get cannon fuse in Canada? (65 replies)
250. Polumnas! (movie clip) (6 replies)
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251. Cherry bomb picks! (97 replies)
252. new smoke comp. (20 replies)
253. Small, cheap smoke grenades (36 replies)
254. white powder wont xplode!!!!!!!!!! (34 replies)
255. H2O2 Stuff (2 replies)
256. Anthony's AP disaster (24 replies)
257. Non-catalyst AP and refiltering (12 replies)
258. Loading HTMD when wet? (19 replies)
259. Rockets (219 replies)
260. alchohol or water? (49 replies)
261. Peroxide stabilizers (23 replies)
262. not sure about the chems... (AP) (32 replies)
263. TATP... A Coming of age story (7 replies)
264. Pyrodex as a rocket propellant? (37 replies)
265. AP and ketones not oxidizing (16 replies)
266. UPGRADE SHUTDOWN!!! (0 replies)
267. Using TCAP in thermobaric charge? (10 replies)
268. Oxygen balance (21 replies)
269. the minimum amout (6 replies)
270. Dimmer and trimmer (3 replies)
271. AP movies (24 replies)
272. 7 litres of 60% H2O2 (13 replies)
273. Common sense (2 replies)
274. Undistilled water in HMTD -BOOM??- (6 replies)
275. Peroxide stablizers (1 replies)
276. keto-RDX peroxide? (13 replies)
277. transannular peroxide (3 replies)
278. New Rules, New Sections. Listen UP! (0 replies)
279. Peroxalic Acid (17 replies)
280. Why is detonaton by impact louder? (12 replies)
281. Creme Peroxide (12 replies)
282. benzoil peroxide (1 replies)
283. Explain Please! (6 replies)
284. High powered rocketry (15 replies)
285. Tetramethylenediperoxidedicarbamide, TMDD (28 replies)
286. testing incendiary (sp?) mixture (7 replies)
287. Hydrochloric Acid (8 replies)
288. Full reaction (2 replies)
289. Flashbang (27 replies)
290. It takes 3 days, right? (23 replies)
291. Decomposition of AP under Solution (10 replies)
292. ap witch acid to use (6 replies)
293. Wierd! Solid crystaline AP mass (25 replies)
294. Exotic primary (26 replies)
295. Wal-Mart sources (16 replies)
296. Promised Fuse (34 replies)
297. Washing Ap with.. (12 replies)
298. AP from O2 (16 replies)
299. Plastic Explosive (23 replies)
300. the funniest thing (13 replies)
301. AP toxicity (45 replies)
302. runaway rxn (18 replies)
303. Ap cracker pictures (67 replies)
304. Detonating Wet AP (32 replies)
305. Benzoyl Peroxide (17 replies)
306. Anyone tried this, Camphor? (80 replies)
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The Explosives and Weapons Forum > Energetic Materials > Pyrotechnics and Propellants > what burns a very pretty red
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leonvios October 7th, 2002, 02:47 PM
i was wondering if anyone knows about a sticky paste type fuel that will burn red( a pretty red )and will not burn too vigorously cause i will be using it to show a non piro
(female) for a certain date feb 14th although it is early i am going to make a lot preperation for this day? Any ideas?
<small>[ October 07, 2002, 02:00 PM: Message edited by: leonvios ]</small>
mr.evil October 7th, 2002, 03:03 PM
well i guess an alcohol or aceton soluble strontium or lithium salt, like SrCl or LiCl.
Or maybe you are looking for green? You can make a very deep green color with Boric acid dissolved in ethanol or methanol.
leonvios October 7th, 2002, 03:07 PM
No i am making a heart shape in an aluminium 2mm thick and it must be red and PRETTY and won't burn through it ive looked around and first thought of flares but that would
make to much smoke and probably burn straight through.
leonvios October 7th, 2002, 03:32 PM
thanx mr.evil if there are anymore please post them. Also where can i get these chemicals i am willing to travel all the way south to france as well any information i will be
thankful for.
<small>[ October 07, 2002, 03:23 PM: Message edited by: leonvios ]</small>
Flying Dutchman October 7th, 2002, 05:17 PM
I want to add one to the post of Mr. Evil.
You also can take a Calcium salt.
CaCl would be giving a colour of stone-red.
Strontium and Lithium have to be wine-red.
-FD
<small>[ October 07, 2002, 04:29 PM: Message edited by: Flying Dutchman ]</small>
leonvios October 7th, 2002, 05:23 PM
where do you get this from?
Flying Dutchman October 7th, 2002, 05:34 PM
I don't know what you do for living,
but I'm still a student and I can get it from school.
I guess it's pretty available in the UK.
but good luck with your girl! don't set the house on fire;)
-FD
leonvios October 7th, 2002, 05:39 PM
what is it sold as i mean. or a synth would be nice anyone.p.s i am also a student but no chemicals like that have ever been used where i am at.p.s.s thanx alot dutchman
<small>[ October 07, 2002, 04:44 PM: Message edited by: leonvios ]</small>
Mr Cool October 7th, 2002, 06:30 PM
Hmmm... somehow I don't think making a pretty red heart for Valentine's Day fits well into the theme of an Explosives and Weapons Forum...
But I am in a good mood, and I suppose it is related to pyrotechnics, a little bit.
You need a lithium or strontium salt, mixed into a hot, low-smoke LE. A good, easy to make base for your colour would be a KClO3/sugar mixture, a little low on the KClO3.
K+ gives a weak lilac colour, so won't affect the flame colour much, and won't affect it very negatively even if it does. Don't use a calcium salt as the colouring agent, or your
girlfriend will simply say "That's very nice, but why is the heart orange?" You need the DEEP red from a lithium or strontium salt, calcium gives a shitty brick red which isn't
suitable.
You could probably also mix the colouring salt into a gelled fuel, but make sure you don't have more than three or four carbon atoms in the fuel or you'll start to get a yellow
incandescent flame. Ethanol would work well. I don't know what you'd gell it with though. Also if the heart is too big the flame will lose its shape because of convection
currents, you have to keep the flames fairly short in length or they'll get blown all over the place and it won't look as good. But this will be quite hard to do with a large area on
fire.
You should have plenty of info to be getting on with, now it's up to you to do some experimentation to get it to work.
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The Explosives and Weapons Forum > Energetic Materials > Pyrotechnics and Propellants > Metal Powders Wanted
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simply RED October 12th, 2002, 09:25 AM
Metal powders are extremely dificult to find nowdays in clear forms. Here almost no chemical supplier sells it!
This makes FAE's and flashes difficult to prepare, i've pointed some saurces of metal powders down:
paints containing metal powders, mix the paint with 10 times in volume solvent, wait the metal to precipitate.
Mix the precipitate with acetone, precipitate again, and you have very good metal powder!
Chemical labs store metal powders, if you know people from the labs, they may buy powders for you.
Water Boilers use electron cathode(or it was anode?) (90%Mg, 10%Al) for "antirust".
If you know more saurces of metals...
What about metal powders aquiring in your country?
zaibatsu October 12th, 2002, 11:00 AM
Used in fibreglass to increase its ability to survive heat, usually around 300mesh spherical Al.
Also, Al powder used to fingerprint, you could use that as a story to buy some from a supplier "I'm a science teacher...".
vulture October 12th, 2002, 01:06 PM
I buy my Al powder from a chemist/paint store which also sells loads of other chems. It's an old and somewhat dirty and unorganized store, the real old chemist type.
Magnesium powder is often obtainable as a wast product from certain companies which like to get rid of it as magnesium powder created by by polishing/cutting/grinding is
usually very fine and poses a severe FAE hazard. Just make sure they don't wet it for you! If one has a ball mill, one could easily process Mg camping lighter blocks to make
powder.
EDIT: finally able to post again, thanks to the mods. :D
<small>[ October 12, 2002, 12:07 PM: Message edited by: vulture ]</small>
A-BOMB October 12th, 2002, 01:43 PM
Well a few days ago I was over at EP's new site, and saw something about magnalium. Well now I LOVE it! :D ,its easier to grind/powder than MG or AL, and it burns good.
Because I tried it in a few different comps today when I got back from pheasant hunting this morning I make A few baches of thermite, flash, star mix, with it and I worked
great. It alittle harder to make but, it doesn't need to get ballmilled for a week either, just a little work with a mortar&pestle turns it into a fine powder. So its my new powder
of choice when I'm making comps. I LOVE magnalium! :D
edit: peasant to pheasant
<small>[ October 12, 2002, 04:08 PM: Message edited by: A-BOMB ]</small>
frogfot October 12th, 2002, 04:22 PM
Recently i got a catalogue from new allaround shop (good for me), they have something that is called "rust-protecting paint". Also associated with "cold galvanization", dont
know how to call it in english.
It says that dryed paint on surface contains up to 90% zinc. I havnt bought it yet.
Sold in 1/3; 0,4 and 1l.
0EZ0 October 13th, 2002, 12:18 AM
Well in OZ, metal powders are not that hard to find if you know where to look for them. A site that stocks all types of metal powders including zinc, titanium, aluminium,
magnesium, stainless steel, iron, and many more is <a href="http://www.metalpowders.com.au/" target="_blank">Australian Metal Powders Supplies (AMPS)</a> . They
sell an abundance of metal powders quite cheap.
One company that sells a bronzing powder as an additive to paint is Dulux. Although i think it was very expensive.
Obtaining metal powder from metallic paint has already been mentioned and is quite a viable source if the paint is cheap.
Also if you have a company that specialises in fibreglass products, then they usually have an Al additive available.
Sometimes if you're lucky, a metal machining business might have powder from processing metals. But I don't know about this source as I have never taken the time to find
such a place near me.
Lastly if worse comes to worse, bring out the old ball mill and have a crack at processing your own metal powders :p .
(Edit-spelling)
<small>[ October 12, 2002, 11:20 PM: Message edited by: 0EZ0 ]</small>
inferno October 13th, 2002, 05:05 AM
0EZ0 - There is a thread at xinventions about the Shoalhaven craft supply (sell Al, Cu, brass powders and some others) and AMPS, with prices, mesh etc.
Their (AMPS) Al is #325 mesh, $12.50/kg, Shoalhaven is $19/500g, and it is a 50/50 mix of 325 mesh and 200 mesh. Basically, metal powders in Australia are a waste.
PS a firelighter block is around 20g for $14AU, chem supplies sell Mg turnings $20/100g...
pirotechman October 28th, 2002, 08:16 AM
"chem supplies sell Mg turnings $20/100g..."
With me mg costs $20/kg. But I live in Poland :)
PhRaZMAkInEtIcS November 1st, 2002, 12:33 PM
In bulgaria i've seen Mg and Zn powders for sale but never alluminium powder :confused: .Your chem supplier shoud have them.Also once in school i saw some Zn powder but
someone stole it before me :mad: (i was just going to take a few grams :rolleyes: ).
I've read ,from a not soo reliable source, than when heated to 600 C you can make powder from aluminium by hammering it.Just like Zn(i think)
And is the powder you get from bronze paint really alluminium???
Marvin November 1st, 2002, 10:59 PM
Aluminium is fairly soft, heating it will just make it softer and more likley to oxidise, melting it in air doesnt work very well either, any surface exposed to the air gets a thick
oxide layer, as opposed to the very thin one you get at room temp, the constant motion of the aluminium constantly makes a fresh surfaces, its unworkable this way. Making
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magalum dust would work this way if you value your sanity less than a small amount of metal dust. Magalum is very brittle which is why this would work. Wear a mask if
theres a lot of metal powder in the air, fine metal dust when it gets far enough into the lungs stays there.
Paint grade aluminium works very badly in firteworks, at least what I can get locally, just not fine enough. Most people that absolutly cant get fine Al blenderise or ballmill
aluminium foil, this is extremely common info it must have been mentioned here before.
mr.evil November 3rd, 2002, 10:02 AM
i get my 600mesh coated aluminium powder at an old drugstore in Belgium, for 4 euro's per 100gram (cheap!)
This stuff works perfectly for flash powder... But when i need Al powder for sparks or something i make it my own:
I heat pieces of Al foil above my bunsenbrander, not to long just a few seconds. After that i crumble the foil a bit and then i put it in my electrical coffeegrinder, after a few
times grinding i have about 50-100mesh Al powder, that is very reactive and produces bright, white sparks :)
lucifer November 3rd, 2002, 07:16 PM
I always put aluminum foil in a paper cutter, then put it in a coffee grinder and then put it in a ball mill for some day’s.
The end result will be very fine and very reactive flake aluminum powder,
But be careful at opening the ball mill, it happen to me ones that after a few seconds after opening the ball mill the aluminum powder was on fire. Its good to just open the ball
mill everyday to prevent this from happening.
Nika452 November 3rd, 2002, 09:49 PM
The aluminum that ignited had become pyrophoric. Neat, for I have never actually had this happen to me, although I knew it was possible. Magnesium, along with titanium
and iron also are reputed to react hypergolicly with the atmosphere.
EP December 4th, 2002, 04:08 PM
An excellent page I found recently on making metal powders:
<a href="http://members.shaw.ca/justin.le/grinder.html" target="_blank">http://members.shaw.ca/justin.le/grinder.html</a>
I don't remember where I saw this (maybe on above page) but I read something saying if you just open up the milling jar every few hours or so it will prevent the metal from
becoing pyrophoric.
nbk2000 December 5th, 2002, 12:06 AM
If a person built a glovebox, they could make pyrophoric powder on purpose and handle it in inert atmosphere.
I'd imagine there'd be some uses for highly flammable metal powders that spontaneously ignite in air. <img border="0" title="" alt="[Wink]" src="wink.gif" />
I'd think throwing a bit a dry ice in the milling jar would work to prevent oxidation.
Aluminium, by the way, is one of the few metals that becomes more brittle when hot then when cold. You could pound heated Al ingot into "sand" with a hammer, prior to
milling, which would save a lot of time.
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