| abstract |
A composition comprising a clay, an inert material, optionally a fibrous material, and a fourth component, characterized in that said fourth component comprises a cation selected from the group consisting of Al, Zr and Ti and an anion selected from the group consisting of oxyhydroxide , oxychloride, nitrate, sulfate, chloride, hydroxide and alkoxide, and wherein the concentration of said fourth component ranges from 0.1 to 70 percent by weight (% by weight), preferably 0.5-25% by weight, more preferably 1-10 % by weight, of the total weight of the clay, the inert material, and optionally the fibrous material, together. |