FILLERS In addition to the various rubbers, the reinforcing fillers and their proportional weight within the rubber compounds play an important role. In this sector, WEBER & SCHAER offers the precipitated Perkasil silicica from Grace and Ketjenblack EC, a special carbon for electrically conductive applications from Akzo Nobel. Silica based fillers Name Chemical Abbreviation Brand Name Producer precipitated amorphous Silica SiO2 Perkasil® Grace precipitated Sodium aluminium silica SiO2 / Na 2O / Al2O3 Perkasil® Grace Carbon Black Name Chemical Abbreviation Brand Name Producer Conductive Carbon Black Ketjenblack® Akzo Nobel Silane Name Chemical Abbreviation Brand Name Producer Disulfan Bis-(3-[triethoxysilyl]-propyl)- disulfan (TESPD) Nansil 2 Tetrasulfan Bis-(3-[triethoxysilyl]-propyl)- tetrasulfan (TESPT) Nansil 4 Contact form  |  Contact person