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Ammonpulver


NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.

AP was developed in the late 1880s as a replacement for black powder. It is an intimate mixture of 85 percent ammonium nitrate and 15 percent char- coal. It was used by Germany and Austria as an artillery propellant until nitrocellulose-based powders became commonly available. It was extremly powerful, being on a par with double-based powders containing 30 percent nitroglycerine, and was virtually smokeless and flashless.

Unfortunately, AP had two drawbacks that made it undesirable as a propellant. First, since it was based on AN it was extremly hygroscopic, and second, when it was heated to moderate temperatures (32.1øC), a change in the crystalline structure occured, causing the powder grains to crumble. This would cause a drastic increase in the chamber pressure of guns using this propellant, often causing burst tubes.

Since we will be using AP as a bomb filler, however, this becomes a pos- itive asset. It is very cheap to make - about thirty to fort cents a pound - and is quite insensitive to friction. It is, however, much harder to ignite than black powder, so a booster consisting of a few grams of a more sensit- ive compound such as potassium chlorate/sugar or black powder must be used. As a filler for pipe bombs or related items it is without peer.

Preparation:

1) Grind the AN prills in a blender until finely powdered. Sift through a flour sifter, spread out in a shallow pan, and dry for fifteen to twenty minutes in a warm oven. Pour into an airtight jar and seal.

2) Pulverize the charcoal in a heavy cloth bag, then grind in the blender. Sift.

3) Pour 85 percent AN and 15 percent charcoal, by weight, into a rock or case tumbler and add a handful of lead balls. Tumble for several hours. Open and inspect. The contents should be a fine, dark gray powder. It may be necessary to tumble for an additional lenth of time.

AP must be as finely powdered as sifted flour for optimum performance. The hardness of the charcoal is the major obstacle to achieving this state. I find it simpler to buy powdered charcoal (325 mesh) at a chemical supply house as opposed to powdering barbecue briquettes. This form of charcoal may also be found at companies catering to the sign-painting industry.

Ask for "pounce powder". Both the separate ingredients and the completed powder must be scrupulously protected from moisture during all operations. Any device containing AP should be painted with a sealer as a precautionary measure.

 
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