Discussion
Which of the following is a poor water resistance explosive ?
Answer: C
The explosive with poor water resistance is poured ANFO.
ANFO is ammonium nitrate prills mixed with about 6% fuel oil. Ammonium nitrate is very soluble in water, so loose ANFO poured into a wet borehole dissolves and fails to detonate. That is why it is used only in dry holes.
Packaged ANFO is sealed in plastic and can be used where there is some water. Emulsion explosives have the nitrate solution locked inside an oil phase, and gelatin dynamite contains nitroglycerine gelled with nitrocellulose; both are known for good water resistance.
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