1. Define the Boundary
D50 is the median size: 50% of the measured particle population is below that value under the stated method.
Particle-Size Basics
How to Specify D50, D90, and D97 in a Powder Inquiry
A clear explanation of cumulative particle-size values and how to communicate a meaningful target for milling, classification, and sample testing.
Practical Review Framework
Use the following checks together with the delivered equipment manual, the material safety information, and project-specific operating procedures.
2. Check the Process
D90 and D97 describe the coarse end more strongly and are often important for controlling oversize particles.
3. Confirm with Evidence
Always state the test method, dispersion condition, volume or number basis, and acceptable distribution—not only one number.
What to Record
Record the material batch, feed condition, equipment configuration, operating parameters, sampling method, particle-size method, output, temperature, pressure trend, and any abnormal observation. Comparable records are more useful than isolated numbers.
Need a Project-Specific Answer?
Send the material name, target PSD, capacity, current process problem, and available test data. We can help identify the next information needed for selection or troubleshooting.
Ask an EngineerImportant Note
This technical article provides a general engineering framework. Material risks, equipment limits, cleaning rules, and start-up or shutdown requirements must follow the final project documents and site safety procedures.
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