| abstract |
Pyrogenically prepared silicon dioxide with the following physicochemical properties:n 1. Average particle size (D 50 value) D 50 ≧150 nm (dynamic light scattering, 30 wt %) 2. Viscosity (5 rpm, 30 wt %) η≦100 m·Pas 3. Thixotropy of T i (η(5 rpm))/(η(50 rpm))≦2 4. BET surface area 30-60 m 2 /g 5. Compacted bulk=100-160 g/L 6. Original pH≦4.5n nthat can be used for the preparation of dispersions and glass bodies. |