The present invention relates to the use of a polyurethane system, comprising (a) polyisocyanates, (b) at least one isocyanate-reactive compound, (c) at least one carboxylic salt of an amine catalyst, where, based on one equivalent of the amine of the amino catalyst, from 0.5 to 1.5 equivalents of acid groups of a carboxylic acid are comprised, (d) if appropriate, further catalysts, (e) if appropriate, a reactive chain extender having at least two groups reactive toward isocyanates, where at least one group reactive toward isocyanates is a free, primary, NH2 group, and (f) if appropriate, further additives, for the production of polyurethane sandwich components. The present invention further relates to a process for the production of polyurethane sandwich components, and also to the polyurethane sandwich components obtained by the process of the invention.