HA-90 is a calcined kaolin with high whiteness and moderate grain size. It has the characteristics of moderate oil absorption, good fluidity, good covering performance, etc.In the paper industry as a filler, can partly replace the expensive titanium dioxide, improve the whiteness, gloss, smoothness and opacity of the paper.Improve ink absorption, printing adaptability, printing gloss, etc. Generally used in decorative base paper, whiteboard coated paper and coated paper and other fields.