Near silica-free calcium carbonate filler

Huber Engineered Materials introduces Hubercarb W4 calcium carbonate, milled from micritic limestone ore.

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Huber Engineered Materials (Atlanta, Ga.) introduced at COMPOSITES 2013 trademarked Hubercarb W4 calcium carbonate, milled from micritic limestone ore. Huber says this soft and virtually silica-free ore mills to a more spherical shape than conventional marble sources, which grind to more rhombohedral forms. This is said to provide maximum particle packing and minimize glass breakage during processing and molding operations. Huber also notes that the filler is composed principally of phosphorus, with lesser amounts of aluminum, iron and lead compared to competing products. The material also features low soluble salt content, which provides a consistently low moisture content and reuptake, leading to a stable platform for liquid polyesters.