BALLAST STONE AND PROCESS FOR THE PRODUCTION OF BALLAST STONE

摘要

The present invention relates to ballast stone which have a high stability and a long service life and to a process for the production of ballast. These ballast stones are suitable for railway track laying and road construction and dike systems used for example in costal protection. These ballast stones comprise ballast stones and polyurethane foams based on a reaction mixture of selected polyisocyanates and selected compounds with isocyanate-reactive groups.