Author Topic: Hexamine Blasting Caps  (Read 131 times)

DaMoose

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Hexamine Blasting Caps
« on: September 07, 2009, 09:11:26 AM »
Hexamine Blasting Caps

moose has not tried this: we only found it while looking for an ANFO detonator


Materials

Hexamine (Not the blue stuff, that's Trioxine. Hexamine comes in white pellets, Available at Gunshows and Military Surplus Stores )

Citric Acid (Avaliable at many stores that supply goods for canning foods)

Hydrogen peroxide (Drug store variants are too weak for this composition, Instead obtain at least 30-35% Hydrogen peroxide. This is used commonly to bleach hair, get it at a beauty supply shop)

Mortar and Pestle

Pint Jar with securely closing lid

Coffee Filters


Procedure:

1: Grind the hexamine with your mortar and pestle to a fine consistency then place 1 teaspoon of it in your pint jar

2: Add to this 2 teaspoons of of dry citric acid.

3: Add 1 ounce or about 4 and 1/2 teaspoons of hydrogen peroxide

4: Cap the pint jar and vigorously shake for 10 minutes to make certain you have a well mixed solution. Please do note that larger batches then what I have described can cause heat and detonation. So just keep to small batches and if you notice any heat in your small batch during shaking stop shaking the solution and place it under a steady stream of cold running water.

5: Place this solution in the refrigerator for around 8 hours. You should see white precipitate form in the bottom of the jar

6: Filter the Solution through a coffee filter, then wash the jar with rubbing alcohol and wash the collected composition with it.

7: Discard of the solution

8: While still in the pasty form scrape it off the coffee filter with a wooden tongue depressor. load into your cap casings, this recipe will make one cap of sufficient power to detonate most ANFO mixtures. If you must save the mixture in a dry form ensure you wet it down with alcohol before attempting to handle it. as it is shock and friction sensitive you don't want to become like Kurt *Stumpy* Saxon do ya ?

heisenberg

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Re: Hexamine Blasting Caps
« Reply #1 on: September 07, 2009, 05:56:26 PM »
Ah, where to begin with the problems in the above post.

First, the cap you described does not use hexamine. It uses HMTD, which is made from hexamine.

Second, this is chemistry, not cooking. We do not use kitchen units in the synthesis of a high explosive. Here is the synthesis from megalomania's page:

Quote
Dissolve 14 g of methenamine in 50 mL of 30% hydrogen peroxide in a 200-mL beaker while stirring vigorously with a magnetic stirrer or with a stirring rod. You must also cool this solution by placing the beaker in a salt-ice bath. While stirring, slowly add 21 g of powdered citric acid in small portions to the beaker making sure the temperature stays at or below 0 °C at all times. After adding the citric acid, keep stirring for 3 hours and continue to hold the temperature at 0 °C. Next, remove the beaker from the cooling bath and let it stand at room temperature for 2 hours, discontinue stirring as well. Finally, pour the solution over a filter to collect the crystals of HMTD, wash them thoroughly with water, and rinse with methyl or ethyl alcohol so they can dry faster at room temperature. Dry by setting in a cool place. HMTD does not store well, so deal with it immediately. You will need a graduated cylinder for measuring liquids, and a thermometer to monitor the temperature.

Yields are around 3-4g, which is quite a bit more than is required for one blasting cap. Caps should have no more than .5g of a primary, and then 1-2g of a secondary such as ETN or PETN. HMTD alone (in safe quantity) is probably not capable of reliably detonating ANFO. You need a booster.
I spent all my money on booze and hookers, the rest I wasted - Charles Bukowski

xxx

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Re: Hexamine Blasting Caps
« Reply #2 on: September 11, 2009, 07:01:24 PM »
Dear god this is merely HMTD, a rather nasty bastard of an Organic Peroxide.  I recall finding that with a good, low order detonating 'flash ignitor' it perform as good as Pb(N3)2, but otherwise its a fairly poor energetic - unstable, high-ish vapor pressure, low VoD, low initiaatory efficiency, and very sensitive.

heisenberg

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Re: Hexamine Blasting Caps
« Reply #3 on: September 11, 2009, 07:10:33 PM »
From my experience, flash powder is incapable of reliably detonating PETN or ETN. The flash used was 3:2 KNO3:Mg. That's not to say it can't happen, I just wasn't able to get good results time and time again.
I spent all my money on booze and hookers, the rest I wasted - Charles Bukowski

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Re: Hexamine Blasting Caps
« Reply #4 on: September 11, 2009, 11:31:30 PM »
Where did 'flash powder' come into it? A 'low order detonating flash ignitor' means a shitty, flame sensitive but bad initiation power primary (as in, a Detonating high explosive) like Lead Styphinate or Picrate used to 'kick off' the HMTD, making it instantly dit DDT and be more efficient. Rosco introduced me to the concept and I never looked back!

Ages back I tested flash powder (a PYRO mix) as a initiator - it is not worth wasting money on.

heisenberg

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Re: Hexamine Blasting Caps
« Reply #5 on: September 16, 2009, 08:36:43 AM »
Ah, excuse me. I believed you were referring to using flash based caps. Never mind.
I spent all my money on booze and hookers, the rest I wasted - Charles Bukowski

Douchermann

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Re: Hexamine Blasting Caps
« Reply #6 on: April 20, 2010, 06:14:03 PM »
If one is getting 3-4g of HMTD from 14g of hexamine, one needs to check their procedure.  I consistently got over 14g of HMTD from 14g of hexamine.  Theo is 20.8g for that amount.  I also used 1g caps of HMTD, which always DDT.  I do agree that HMTD is close to incapable of detonating anfo.  Use a booster of a popular picric derivative (ammonium picrate, potassium picrate or picric acid)  HMTD is stable with picric acid.