What type of clay is used in paper coating?

The type of clay commonly used in paper coating is called kaolin, also known as china clay. Kaolin is favored for its fine particle size, high brightness, and Excellent opacity, which enhance the smoothness and printability of paper. It helps improve the paper's surface characteristics, making it ideal for high-quality printing applications. Other types of clay, such as calcium carbonate, may also be used in conjunction with kaolin for specific paper formulations.