| abstract |
The use of a material of empirical composition MgO (CO<sub>2</sub>)<sub>b</sub>(H<sub>2</sub>O)<sub>c</sub>, where b is any value in the range 0.5 to 1.1 and c is any value in the range 0 to 2, and which have an amorphous content of at least 75% by weight, as a filler and/or a fire retardant for a solid orfluid matrix, a solid orfluid matrix (in particular a plastics matrix) containing such a material as dispersed particles, the materials in defined particulate morphologies, some of the materials per se and a process for their preparation. |