| abstract |
Surface-modified, fumed silica having the data: BET surface area, m2/g: 25 - 400; Average primary particle size, nm: 5 - 50; pH: 3 - 10; Carbon content, % by weight: 0.1 - 10; Potassium content (calculated as potassium oxide), % by weight: 0.000001 - 40; is prepared by subjecting a fumed silica to surface modification in the presence of potassium compounds. It can be used in LSR silicone rubber compositions as a filler. |