Magnetite

Bausano in many years of production, research and development of plastic extrusion with additive and fillers worked also with Magnetite. It is a naturally occurring iron oxide with the chemical formula Fe3O4. It is mined from several deposits worldwide and although most is used to make iron and steel, the many special properties of magnetite have led to several other applications including as a filler for plastics and coatings.

A black lustrous powder with unusual properties. Often used for its high density (5.2 gcm-3 for pure grades). It also has high thermal conductivity and quite high electrical conductivity. It is x-ray opaque and can be used to block radiation.

The first commercial application in polymers was developed in the late 1990s.

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Magnetite in extrusion processing

In many fields, magnetite is used as ballast, to add mass. Likewise, it is added to plastics like polypropylene, polyamides (nylons) and polyethylene, to give a dense compound.

Sometimes the density is desirable to add heft and the feeling of high quality. In other cases, the added density is useful for sound damping, one of the most common uses in plastics, where it is used by several major automotive companies, and also Bausano has experience with its extrusion lines and R&D tests with magnetite. Loadings of 80 weight% or higher are common and composite densities of around 3.0 gcm-3 are easily possible. Different grades of magnetite have been developed for different applications; they mainly differ in particle size (distribution).

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