The most popular particle size AP we carry. Used in composite propellants and most any other pyrotechnic mixture calling for AP. Excellent source of chlorine for rich color flames. Stars and other devices made with AP usually have slower combustion rates. Magnesium must be properly coated for use with AP, otherwise, decomposition and heat could evolve in storage (moisture related), possible ignition may occur. No ATFE required to purchase any of our ammonium perchlorate in less than full drum quantities.