ASTM B822 Standard Test Method for Particle Size Distribution of Metal Powders and Related Compounds by Light Scattering

EUROLAB laboratory provides testing and compliance services within the scope of ASTM B822 standard. The ASTM B822 standard covers the determination of particle size distribution by light scattering, reported as percent by volume, of particulate materials, including metals and compounds.

This test method is applicable to analyzes with both aqueous and non-aqueous dispersions. In addition, analysis can be performed with a gaseous dispersion for materials that react with a hygroscopic or liquid carrier. ASTM B822 is applicable to the measurement of particulate materials in the range of 0,4 to 2000 µm, or a subset of this range, applicable to the measured particle size distribution.

The reported particle size measurement is a function of both the actual particle size and shape factor and the specific physical or chemical properties being measured. Care should be taken when comparing data from instruments operating in different physical or chemical parameters or in different particle size measurement ranges. Sampling, processing and preparation can also affect reported particle size results.

It is important to be aware that results obtained with this test method or any other method for particle size determination using different physical principles may differ. The results are strongly influenced by the physical principles used by each particle size analysis method. The results of any particle sizing method should be used in a relative sense only; should not be taken as absolute when comparing results obtained with other methods.

Light scattering theory has been used for many years to determine particle size. Few test equipment manufacturers now have units based on these principles. Although all types of test equipment use the same basic principles for light scattering as a function of particle size, different assumptions about applying the theory and different models for converting light measurements to particle size can lead to different results for each device. Therefore, using this test method cannot guarantee directly comparable results from different types of devices.

Knowledge of the particle size distribution of metal powders is useful in predicting the powder processing behavior and final performance of powder metallurgy parts. Particle size distribution is closely related to the flowability, mouldability, compressibility, and mold-filling properties of a powder, as well as to the final structure and properties of finished powder metallurgy (P/M) parts.

This test method is useful for both suppliers and powder users in determining particle size distributions for product specifications, production control, development and research. As with acceptance testing, this test method can be used to obtain data for comparison or conformity between lots of the same material.

Values ​​stated in SI units will be accepted as standard.

This standard does not purport to address all, if any, safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.

Our organization, EUROLAB, provides standard test method services for the particle size distribution of metal powders and related compounds by light scattering, within the framework of national and international standards, with its trained and expert staff and advanced technological equipment, among numerous test, measurement, analysis and evaluation studies. Provides testing services within the scope of ASTM B822 standard.