The Importance of Particle Size Distribution in Gypsum
Particle size distribution plays a key role in determining the performance and quality of gypsum products. In the construction industry, particle size can influence setting time, compressive strength and density, making accurate measurement essential for consistent production. Laser diffraction particle size analysis enables manufacturers to assess gypsum powders before and after grinding, helping them understand how processing affects particle size and overall product performance.
Controlling Gypsum Processing
Gypsum has a long history of use, from ancient Roman architecture to modern construction materials. Manufacturers typically process natural gypsum through crushing, grinding and heating to produce plaster, including hemihydrate gypsum. When mixed with water, this material sets into a hard mass, making it valuable for a wide range of building applications.
Several factors influence the properties of gypsum, including water content, filler composition and particle size distribution. Grinding plays a particularly important role because it changes the size of the particles and the surface area available for interaction. Manufacturers need to monitor these changes to achieve the desired product characteristics, maintain consistent quality and optimise processing conditions.
Measuring Particle Size with Laser Diffraction
Laser diffraction offers a rapid and repeatable method for measuring particle size distribution across a range of materials. The Bettersizer ST combines laser diffraction technology with a patented DLOS optical system to deliver accurate, reproducible measurements for quality control applications.
This application note uses the Bettersizer ST to analyse two commercially available gypsum powders used in construction. By comparing particle size distributions before and after grinding, the study demonstrates how laser diffraction can identify differences between samples and assess the impact of processing. The results also highlight the instrument’s repeatability, supporting reliable particle size measurement for routine gypsum production and quality control.
