Alexander Kulichenko, Europiren, outlined flame retardant application of brucite, a natural magnesium hydroxide mineral. Performance and chemical composition are improved by sorting of the mined mineral using X-ray technology (stone by stone) according to content of other elements (calcium, magnesium, iron, silicon), precision milling to maintain specific surface area and surface treatment (with stearic acids, silanes). Coating can prevent problems of temperature resistance and ageing resulting from impurities in the brucite. A new coating with alkyl silane is now available, this enables application in polypropylene for cables, for example in the automotive cable market or for roofing, where companies are looking for non-halogenated solutions.
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