CSC Blog Enhancing QC with Mid-Point Sieves Precision in Particle Size Analysis

The Need for Mid-Point SievesASTM and ISO establish standards for the acceptable range of openings in a wire mesh sieve. For larger mesh sizes, the variation between the largest and smallest acceptable openings has little impact on sieve performance. However, as mesh sizes decrease, the potential for performance differences between sieves becomes significant. These discrepancies, especially when an old sieve is replaced in a master stack, can lead to problematic QC data. Mid-Point sieves can help alleviate this issue.What is a Mid-Point Sieve?A mid-point sieve has had the mesh inspected after mounting. The sieve is then selected as a mid-point if the results give tolerances that are in the middle of the ASTM standard.