Apparent density describes how powder packs when freely poured under specified conditions; tap density describes packing after vibration. Interpret both with particle size, morphology and test method.
Engineering focus: Apparent and tap density of stainless steel powder
Review the material, particle-size, process and validation factors that matter for this application.
Cavity filling trends are related but not the only determining factor.
It can help to understand the packing, but it is not equal to the sintering density.
Data from different methods cannot be mixed directly.
Apparent density relates to powder filling
For powders that flow freely through a Hall funnel, ASTM B212 can be used for apparent density measurements; powder moisture, lubricants, temperature, etc. will all change the results.
Tap density describes packing after vibration
Tap density alone cannot represent sintered density, but it can be used together with apparent density, particle size and morphology to observe powder accumulation and compaction trends.
Align test conditions before comparing results
Differences in funnels, tapping conditions, sampling and units will cause differences in results. Suppliers and customers should write out the methodology in specifications rather than just agree on a number.
Discuss your powder project
Share the process step, operating conditions and part result you want to improve.
- Target grade, batch or order information
- Particle size, density, flow or composition items of concern
- Customer inspection methods and receiving requirements
- Packaging, labelling, delivery and traceability needs
Technical references for this page
These references explain materials, processes or test methods. Third-party product data does not represent Tongcheng product specifications.