Fillers for Polymer Applications by Roger Rothon

Author:Roger Rothon
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Safety

Pure magnetite is considered safe for food contact applications. In fact, it has been shown to exist within every living organism from bacteria to plants and humans. Such biogenic magnetite is crucial to the guidance systems of bats, birds, and bacteria. All naturally occurring unmodified minerals are automatically TSCA listed and REACH exempt.

Density

There are two main applications for dense fillers. The most obvious is to increase the density of plastics, where the added heft gives the perception of a quality product and is also sought for negative buoyancy, in counterweights and ballast. The other major benefit is in sound- or vibration-damping materials where added density leads to substantially better performance. Often a dense filler is used at high loadings in a soft polymer which is “lossy,” i.e., it is inelastic and flows when deformed thereby converting mechanical energy to heat. Such materials are characterized by a high loss factor, i.e., tan delta as measured by DMA, for example (Table 2).Table 2Magnetite is more effective than other fillers for density enhancement (example in PP)

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