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Fyllningsegenskaper, often translated as "filling properties" or "filler properties" in English, refers to the characteristics of a material that make it suitable for use as a filler in various applications. These properties dictate how well the filler integrates with the base material, its impact on the final product's performance, and its overall effectiveness. Key filling properties include particle size and distribution, shape, surface area, chemical inertness, and density. Particle size and distribution are crucial for determining the filler's ability to pack densely and affect the viscosity of the mixture. Smaller particles generally lead to higher surface areas, which can enhance mechanical properties but also increase the binder requirement. The shape of the filler particles, whether spherical, irregular, or fibrous, influences flowability, reinforcement, and the optical properties of the final product. Chemical inertness is important to prevent unwanted reactions with the matrix material or the environment. Density plays a role in the weight of the final composite. In materials science and manufacturing, understanding and controlling these filling properties are essential for optimizing product performance, cost-effectiveness, and processing. For example, in plastics, fillers are used to reduce cost, improve stiffness, or enhance electrical conductivity. In paints and coatings, they can affect opacity, texture, and durability. In rubber, fillers like carbon black are vital for improving strength and abrasion resistance. The selection and processing of fillers with appropriate properties are therefore a critical aspect of formulation and product development across many industries.