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What is the smooth white coating on my paperboard packaging?

April 26, 2017Coating packaging paperboard smooth white

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What is the smooth white coating on my paperboard packaging?

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This naturally white coating is typically made from calcium carbonate (limestone) or kaolin clay, two of the most abundant minerals on earth. Many paperboard packages are coated with this “clay” to create a smooth printing surface, barrier for food, or simply a clean white look. This coating does not interfere with the natural recyclability or compostability of paperboard.