Elkem® Microsilica® is the original and market-leading silica fume product. Silica fume is a key ingredient in many construction materials. Elkem® Microsilica® is available worldwide in a range of innovative slurry and powder options tailored to customer needs. Elkem® silica fume products are used to produce concrete, mortar, and grout mixtures. They improve the performance of concrete and mortar formulations. Silica fume physically optimizes particle packing of the concrete or mortar mixtures and acts chemically as a highly reactive pozzolan.