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8152442 
Journal Article 
INTERLABORATORY STUDY OF A METHOD FOR MEASURING AMMONIUM PERCHLORATE PARTICLE SIZE 
Alley, BJ 
1970 
265-278 
An interlaboratory study of a method for measuring the particle size distribution of inely ground ammonium perchlorate was conducted by the Analytical Chemistry Working Group of the Interagency Chemical Rocket Propulsion Group (ICRPG). The primary objective of the study was to determine the suitability of the method for use as a standard specification procedure by evaluating its precision. Single analyses of two different ammonium perchlorate samples, having weight median diameters in the rangeof 20 to 30 U were made by each of nine laboratories, using the same liquid sedimentation technique and equipment. Thr random error within laboratories and the systematic error among laboratories were resolved, and confidence intervals were placed on the determination of specific surface areas and weight mean diameters. The random error estimate was acceptably small; however, the systematic error estimate was so large that the method is not recommended for use as a standard specification procedure.