From paints to cosmetics and paper to agriculture, mineral fillers play an important role. Mineral additives such as Calcium Carbonate, Talc, and Dolomite are integral components that enhance the product performance of various products. While manufacturers and industries often seek premium quality additives, they often underestimate the importance of filler’s particle size. The particle size of minerals significantly affects the mechanical, optical, and chemical characteristics of the final product. Let’s understand in this blog, the importance of particle size in optimizing product performance across multiple industries.
But, First, What is Particle Size
In simple terms, particle size refers to the dimensions of individual particles in the mineral fillers. Generally, the particle size of fillers is measured in Mesh or Micrometers/Microns (µm). Even fine-quality mineral additives contain particles of different sizes, and therefore, it is estimated in terms of particle size distribution. Particle size influences the behavior and interaction of fillers with other raw materials.
Measurement of Particle Size
There are different techniques used to measure fillers’ particle size based on the material type and quality. Common techniques include sieve analysis, laser diffraction, and light scattering techniques. To keep it simple you can always ask your mineral additives manufacturers and suppliers about the particle size.
How Does Particle Size Affect the Properties of an Industrial Product
Particle size of mineral fillers affects the properties of final products in the following terms:
Durability and Rigidity
Fine mineral particles with a high surface area-to-volume ratio improve the strength and rigidity of the final product. They facilitate better stress transfer and, therefore, better particle-product interactions. However, there’s a drawback associated with excessive fine particles. Excessively fine particles may lead to agglomeration, compromising the mechanical integrity.
Wear and Tear Resistance
Coarser filler particles can improve the impact resistance of the final products. They can promote energy dissipation during deformation resulting in a quick and hassle-free process. However, if the particle size is too much greater, it may defect, initiating unpredictable cracks under stress.
Viscosity Modification
Fine and uniform particles can increase the viscosity of liquid systems. It enlarges the surface area which requires more energy to achieve flow. Therefore, in mineral filler applications in adhesives and sealants, higher viscosity is desirable.
Opacity and Brightness
Micronized fillers for the Paint industry, Paper manufacturing, and other processes can contribute to opacity and brightness. Smaller particle size enhances the light scattering, improving the overall opacity and brightness. It is beneficial, particularly for paper productions, where high opacity adds vibrancy and readability to printed text and images. Therefore, if you are looking for greater readability go for mineral additives with smaller particle size.
Surface Finish and Texture
Fine and uniform particles lead to a smoother surface finish. For example, fine particles in the Paint industry can lead to gloss and streamlined surfaces that result in easy application. On the other hand, larger particles can create the rougher texture of the final products affecting the aesthetic appeal of the final products.
Flow and Dispersion
Coarser particle size improves the flow properties of the product and also reduces dust generation. But there’s a limitation. With larger particles, it is challenging to achieve uniform dispersion, leading to irregularities in the final products.
What is the Ideal Particle Size for Mineral Fillers
Wondering how one would find mineral additives with appropriate size for an application? Just depends on specific needs and use, for instance, Talc & Dolo-Talc powder for Paints industry with particle size (D97) being between 30 µm ~ 10 µm – increases opacity/brightness without interfering with texture. On the other hand, in polymer application, adding a fine particle size (D97) range between 25 ~ 15 µm can add to the durability, longevity, and cost-effectiveness.
Therefore it is best to consult Silver Stone Industries, manufacturers and suppliers of fillers and extenders to find the ideal particle size for your project.
Final Takeaway
The particle size of mineral fillers plays an important role in different industries. It impacts the mechanical, optical, and physical properties of final products. As a manufacturer, you must understand the effect of fillers’ size on various properties to make an informed decision. For a quote or query related to micronized mineral fillers, you can connect with Silver Stone Industries. Being one of the leading mineral processing firms in Udaipur, we know the importance of particle size and other factors in determining the performance of mineral fillers across various applications!
