| ULTRASIL 5000 GR is a mechanically compacted granulate. On account of the granulation process it leads to less dust development during mixing. ULTRASIL 5000 GR is a highly dispersible and reinforcing silica with a specific surface area of approximately 120 m2/g. Compared to standard silicas with a specific surface area of approximately 160 m2/g. ULTRASIL 5000 GR provides lower compound viscosities, ie an improved processing behavior at equal loading. Furthermore, lower dynamic stiffness at low ambient temperatures and improved rolling resistance are achieved for tire tread compounds. Higher silica loadings will improve wet traction properties and allow to optimize winter properties. Bifuctional organosilanes like Si 69®, Si 79®, Si 266® or VP Si 363® are required for the use of ULTRASIL 5000 GR in tired tread compounds. The use of diethylen glycol, triethanolamine or other alkaline accelerators might be necessary in order to achieve optimum in-rubber data. Application fields are: Tires, mechanical rubber goods.Information provided by Evonik |
