Sillitin Z 86 puriss quartz and kaolinite mixture Hoffmann Mineral Extenders / Fillers >> Silica Extenders / Fillers >> Kaolin The puriss grades of Neuburg Siliceous Earth have been subjected to a final process. As a result, the sieve residue - already very low for the standard grades - is further markedly decreased. The puriss grades, therefore, are characterized by considerably lower abrasivity, with corresponding advantages in low wear of mixing equipment and processing machinery. The physical aftertreatment also considerably improves the dispersibility of the products, especially in low viscosity compounds. Extender and filler. Extender and filler with low abrasivity and good dispersibility.