Particle Size (Sieve Analysis) of Plastic Materials ASTM D1921
ASTM D1921 test method deals with the particle size of plastic materials in the powdered, granular, or pelletized forms. It utilizes a dry sieving, with a lower limit of measurement to be 38 µm. Multiple and specific sieves are selected for test methods A and B, and the distribution of particle diameter and size are determined. SI units are considered to be standard.