Fillers are particles added to material (plastics, composite material, concrete) to lower the consumption of more expensive binder material or to better some properties of the mixtured material. Worldwide more than 53 million tons of fillers with a total sum of approximately EUR16 billion are used every year in different application areas, such as paper, plastics, rubber, paints, coatings, adhesives and sealants. As such, fillers, produced by more than 700 companies, rank among the world's major raw materials and are contained in a variety of goods for daily consumer needs.[1]

Formerly, fillers were used predominantly to cheapen end products. Today, it has been proven that fillers are also able to enhance technical properties of the products. As a result, a number of optimized types of fillers, nano-fillers or surface treated goods have been developed.

Among the 21 most important fillers, calcium carbonate holds the largest market volume and is mainly used in the plastics sector. While the plastic industry mostly consumes ground calcium carbonate the paper industry primarily uses precipitated calcium carbonate that is derived from natural minerals.

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