Method for the improved utilisation of plastics in the preservation of biological preparations

The invention relates to a process for the delayed or incomplete curing of polymerisable polymer solutions (for example silicone rubber, epoxy resins), which are used as impregnating baths in the vacuum impregnation of biological preparations, where, after impregnation, these preparations are separately accelerated and cured completely. After each impregnation cycle, the remaining polymer solution can be re-used, while complete curing of the preparations takes place rapidly, whereupon the preparations can be used. A potential loss of the preparations during the impregnation caused by untimely polymerisation of the polymer solution for impregnation is excluded in this method. The option of re-using the remaining polymer solution in question allows the costs of routine impregnation of biological preparations to be cut drastically. In principle, this aim is achieved by the fact that substances necessary for curing the polymer solution, such as crosslinkers or activators, do not come in contact with the polymer solution for impregnation or in minimum amounts only, but are supplied separately to the plastics-impregnated preparation in a sufficient amount, or are already present in the preparation itself. This is achieved according to the invention by using a curing bath or a gaseous curing medium, with which the plastics-impregnated preparations are brought in contact, or, alternatively, by using biological substances of the preparations themselves (for example amines).