This document describes a test method to determine the amount of material finer than the No. 200 sieve (0.074mm) in aggregates. The test involves drying an aggregate sample, washing it over nested sieves, drying the washed sample, and calculating the percentage finer than the No. 200 sieve by comparing the dry weights before and after washing. An acceptable percentage finer is 5% for normal concrete and up to 3% for wear-resistant concrete.