These are used as extenders in black rubber blends, and as reinforcing fillers in light-colored materials. Light-colored fillers primarily consist of silicic acid, different variants of silicate, and chalk. Some have been finished in order to improve dispersion or physical properties. This group also comprises different variants of aluminum hydroxide and magnesium hydroxide, which are primarily used in large amounts (150–300 phr) in rubber blends for halogen-free, flame retardant applications, e.g. in EVA materials for cable sheaths.
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