Investigations of Elkem Micro Silica by thermosonimetry

Abstract Elkem Micro Silica is an amorphous non-crystalline (glassy) material with a SiO 2 -content of about 96 % SiO 2 . This material has been investigated by thermosonimetry, TS. By this technique it has been possible for the first time to detect small amounts of cristobalite in the material. From semiquantitative determinations of the peak areas in the TS-diagrams of the transformation α-cristobalite to β-cristobalite at 260 °C, it has been possible to estimate the content of cristobalite in Elkem Micro Silica to be less than 0.3 weight%.