A release agent composition is provided which contains as components: a) at least one phosphate and b) at least one compound having at least two hydroxyl groups and having a molecular weight of less than 250 g/mol, the proportion of the component a), based on the composition, being from 0.1 to 70% by weight and the proportion of component b) being from 0.5 to 90% by weight. A process for the production of composite mouldings in which the release agent composition is used, composite mouldings obtainable in a corresponding manner and the use thereof also described.