abstract |
Silicon precipitation acid with an isolated SiOH isolation ratio greater than or equal to 1.5, a density of silanoles groups of 1 to 3.0 SiOH / nm2 and a modified rammed density of 1 to 50 g / l, characterized in that it has a value of pH 3-5, excluding a precipitation silicic acid with a pH value of 4-5. |