It is calcium carbonate with a purity of over 99.9% and an extremely low alkali content.
The content of Fe, Mn, and Cr is extremely low at the ppm level, and the calcium carbonate has also reduced the content of Sr, which is traditionally considered difficult to separate from Ca. It is used not only as a raw material for ceramic capacitors and PTC thermistors but also for high-quality CaF2 lens materials and raw materials for optical fibers.
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Ube Materials Corporation is a manufacturer of specialty inorganic materials based in Ube City, Yamaguchi Prefecture. Using limestone, which is abundantly produced in Mine City, as raw material, the company produces calcium-related products such as quicklime and hydrated lime, as well as extracting magnesium from seawater using quicklime as a raw material to manufacture products like magnesium hydroxide and magnesia clinker (refractory material). Additionally, as a unique business, the company has developed a healthcare division that directly serves consumers by selling lime as a dehumidifying agent, and now offers products such as toothpaste, bath cosmetics, and other cosmetics through co-ops, mass retailers, mail order, and online sales.
