amfo is the correct term. Short for ammonium nitrate / fuel oil .
It is actually quite hard to set off. It needs a very good kick to get it going, hence the loop to insure it gets a kick in several places. I have seen soft drink bottles of it set off with a cap in the top & only 1/2 goes bang. The other 1/2 is still sitting there unreacted.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving