Despite reading the "list of explosive materials" and most of the
clarifications, etc. regarding hobby rocket motors, I have yet to see
the ATF's actual definition of "ammonium perchlorate composite
propellant". It seems like a fairly straightforward term, but it's not.
How much AP does a formula need to qualify as APCP? Does it have to be
the only oxidizer? What about 12% HTPB, 3% Al, 25% AP, and 60% AN?
Ammonium nitrate propellants are not on the list, and have so far
avoided regulation. How about AN/AP blends? At what AP concentration
does it become APCP?
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