Authors' prepd. NQ was dissolved in (1:22) glycol, (1:4) DMF, (1:2,5) DMSO, or (1:4 w/w) NMP and crystd. from supersatd. solns. at < 50 degrees C, cooling rate 3 or 10 degrees C/min, at 800, 1000, 600, and 300 rpm by pptn. with Me2CO, -, EtOH, and Me2O, resp., to yield NO of crystal size, bulk d. and tap bulk d. 80500 (plates), 0.25, 0.32; 100-400 (spherical polycrystals and needles), 0.58, 0.63; 70-600 (grains), 0.56, 0.60; and 80-300 pin (spherical polycrystals), 0.79, 0.86 g/cm(3), resp. The closest-packed (no needles) and densiest were the 30-ppm Ni(NO3)(2)-seeded, Me2CO-pptd. polycrystals from NMP. Plastic-bonded explosives (PBX) were prepd., contg. 84% of (10-150-mu m hexogen + 80-300-mu m NQ) and 16% of a butadiene-styrene rubber-based binder. With NO added as flegmatizer in 20-80% to the 84% PBX, the sensitivity of the PBX fell so as to require impacts of 34.3-49.1 Nm (vs. the 29.4 for the 0%-NQ PBX) to respond. The detonation velocity of the (15:80%) NQ-oktogen PBX, d. 1.775 g/cm(3), was 8616 m/s.