In ET series, spherical titanium dioxide is used as a core and it is coated with ATO layer. Basic properties are summarized in the table as below. 

 ET-500W and ET-600W are based on pigmental titanium dioxide (primary particle size : 0.25 μm), while ET-300W is based on ultra-fine titanium dioxide （primary particle size : 0.04μm）.  

FT series are rutile acicular TiO₂ coated with ATO layer, which is commercially produced only by ISK. Three grades with different sizes are available. The greatest feature of FT series is to be able to get the required conductivity with relatively lower content than spherical type such as ET series because of acicular shape. The use of FT series can reduce the content to 1/2〜1/3 of spherical type.　While there are several different types of acicular or fibrous conductive materials based on potassium titanate, FT series  are not easily broken and have excellent stability of conductivity under various dispersion strength in comparison with other materials.