Additives feature | Magnetite
SEM image of LKAB Minerals’ MagniF 10 high-purity natural
magnetite
high viscosity so only low loadings can be used. Nano-magnetite also has poor thermal stability making it unsuited to typical polymer processing methods. Natural magnetite is far more stable and much
Magnetite is generally recognized as safe (GRAS). Like other natural minerals, it is TSCA listed and REACH exempted by definition. LKAB Minerals supply natural magnetite grades with such purity that they comply with FDA standards for use in food contact plastics.
Types and sources of magnetite Nanoparticulate magnetite is a synthetic material used for specialty applications such as magnetic fluids, but not normally used in plastics. Nanoparticles lead to
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better suited for polymer use, but was slow to develop because the market requires high purity and a very finely ground material. Some decades ago, Minelco, now known as LKAB Minerals, set out to create filler grades and then to identify applications for the newly created specialty filler. That journey has been an interesting one culminating in many and diverse uses, several of which have been mentioned in this article. The list continues to grow year by year as people learn of the filler and how it can bring their products to the next level of performance. Just as magnetite compasses helped ancient sailors
to find the New World, magnetite is still helping pioneers to create a new world of materials and applications.
About the author Dr Chris DeArmitt is business development manager for polymers and coatings at LKAB Minerals. ❙
www.lkabminerals.com
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