Hall and Carney funnels address metal powders with different flow behavior. Interpret their results separately from actual powder feeding, feedstock rheology and die or cavity filling.
Engineering focus: Hall and Carney flow testing for metal powders
Review the material, particle-size, process and validation factors that matter for this application.
Suitable for powders that flow through the specified funnel under the test conditions.
The methods differ, so their results are not directly interchangeable.
Laboratory flow rate does not replace in-process performance.
Limits of the Hall method
Hall flow rate applies to powder that can pass through the specified funnel. A fine or non-free-flowing powder without a Hall value is not automatically unsuitable for MIM.
Other methods for non-free-flowing powders
The Carney funnel offers another comparison method for certain non-free-flowing powders, but elapsed times from different methods must not be compared directly.
Evaluate performance in the customer’s process
Actual powder feeding, feedstock rheology, injection filling and die filling also depend on equipment, formulation, environment and operation. Correlate laboratory data with production results.
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.