Ammonium perchlorate molecular weight

Ammonium perchlorate is a colorless, crystalline compound having a density of 1.95 g/mL and a molecular weight of 117.5. It is prepared by a double displacement reaction between sodium perchlorate and ammonium chloride, and is crystallized from water as the anhydrous salt. 

Molecular weight 117. 9, colourless rhombic crystals, specific gravity 1.95 and it is the least used of all the oxidizers in the firework industry. It has a transition point-to the tetragonal system at about 2 0 C. It is said that pure ammonium perchlorate sublimes without melting when it is slowly heated in the air, but when we heat the normal commercial material in a porcelain crucible with an electric heater, it decomposes violently at 260 360 C. A sample which was recrystallized four times decomposed at 386 0. From this fact we know that ammonium perchlorate decomposes easily due to the action of some impurities, Cr etc. 

Double-base propellants may be formulated to include fuels such as aluminum metal, oxidizers such as ammonium perchlorate (AP), or energetic materials such as the nitramines RDX or HMX. The resulting compositions are termed composite-modified double-base propellants. A further modification, the addition of a polymer that is curable with a low molecular weight curing agent, allows formulation of propellants with much improved mechanical properties over the temperature range of usage. Such propellants are termed elastomer-modified composite double-base (EMCDB) propellants. 

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