ASTM B859 is the ASTM standard practice for de-agglomeration of refractory metal powders and their compounds prior to particle size analysis. It provides a defined approach for preparing powder samples so particle size measurements can better reflect the material itself rather than lumped particles or soft agglomerates. For laboratories, suppliers, and quality teams, this matters because sample preparation can strongly affect the reliability and comparability of particle size results.

What is ASTM B859?

ASTM B859 addresses a preparation step used before particle size analysis of refractory metal powders and their compounds. The standard practice focuses on de-agglomeration, which helps separate clumps that may form during handling, storage, or transfer. By improving sample condition before measurement, the practice supports more consistent testing and more meaningful particle size data. As an ASTM standard, it is typically used as a technical reference for laboratories seeking repeatable preparation methods.

Where is ASTM B859 used?

ASTM B859 is commonly used in powder testing environments where refractory metal powders or related compounds are evaluated for particle size. It is relevant in laboratory workflows that require careful sample preparation before measurement, including incoming inspection, production quality control, and materials characterization. The standard is also useful when different teams or facilities need a shared preparation method to support comparable particle size analysis results across batches or test programs.

Why is ASTM B859 important?

ASTM B859 helps reduce one of the common sources of variability in powder analysis: agglomerated material that can distort particle size results. Using a consistent de-agglomeration practice supports better test repeatability, clearer product evaluation, and more dependable compliance documentation. For procurement and quality control teams, it can also reduce disputes caused by inconsistent sample preparation. In practice, ASTM B859 helps ensure the analysis reflects the powder more accurately.

• De-agglomeration practice for refractory metal powders
• Sample preparation before particle size analysis
• Supports repeatable laboratory testing
• Useful for quality control and product evaluation
• Helps improve consistency in measurement results