How to Prepare and Disperse your Sample for Particle Size Measurement by Laser Diffraction

Laser diffraction is a well-established particle size measurement method whose main advantages include a broad measuring range, high precision and repeatability, and short response times. Though robust, the method, like all particle sizing techniques, has a few caveats. The sampling method, dispersion parameters and a few key measurement parameters must be rationally selected and adjusted to ensure accurate and reproducible results. This paper is a short guide to preparing and dispersing particles for size measurements using Anton Paar PSA instruments. The specifics of both liquid and dry measurement modes are discussed.


Particle size and particle size distribution (PSD) greatly influence the properties of particulate products, potentially impacting their quality, processing, transport, storage and shelf life. Laser diffraction is a well-established and efficient method for determination of particle size, characterized by a wide measuring range spanning from the submicron to the millimeter scale. Laser diffraction is a rather robust measurement technique, however, some key parameters have to be carefully considered and adjusted in order to achieve satisfactory results.

This white paper is intended as a guideline for choosing a dispersion method and optimizing both the dispersion and the measurement parameters based on sample properties. Following these guidelines is essential for achieving accurate and reproducible results with Anton Paar Particle Size Analyzers (PSA).

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