Evaluation of Uniformity of Powder Mixture with a Local Analysis Method

Minimum Number of Measurements Required for Sampling

Abstract

A method for evaluating uniformity of a mixed powder is proposed based on a local analysis method. The number of measurements for a given volume or mass at different locations in mixed powder to ensure the uniformity of sampling from the standard deviation, was calculated with a simple statistical model. The calculation result for the measurements with micro FT-IR as a local analysis method suggested that more than 20 measurements are required in order to ensure the uniformity of sampling of mixed powder, which was also confirmed through the experiments.