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The influences of reaction conditions and compositions on the physical properties of gels in the system (CH3)2SiO-SiO2 were investigated. These materials are prepared by cohydrolysis and cocondensation of (CH3)2Si(OEt)4 and were developed for being used as abrasive powders with limited effectiveness. They are applied for cosmetical or medical purposes, e.g. smoothening the human skin. Hydrolysis and condensation are monitored by IR, NIR and MS methods, for characterization of the materials SEM, SAXS, BET surface measurements, and a special abrasive test were used

1. Die Synthese der Verbindung (VI) erfolgt ausgehend vom Ester (III) [aus der Vorstufe (I)] über die Stufe (IV), diejenige von (IX) ausgehend vom (III)‐Analogen (VII) über die Stufe (VIII).

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