HA-90T is a high brightness, fine particle size, reasonable particle size distribution and small screen residue calcined kaolin. It has low conductivity, low impurity content, low grind fineness, good dispersion stability, good suspension property and chemical stability. It can improve the sedimentary stability and longer service life of the electrocoat bath in electrophoretic paint. It also can improve salt spray resistance, smoothness, compactness and homogeneity of the film.