CCW MiraSTOP CG-F is a Chemical Grout and is Flexible once combined with CCW MiraSTOP CG-F CAT (Catalyst) and then allowed to react with water. This one-component, solvent-free, flexible polyurethane injection resin is mainly used for wet cracks and joints, and has a free expansion of 800%. The reaction speed can be adapted easily by varying the catalyst content from 6% to 10%. The more catalyst is added, the faster the reaction time will be. The reaction with water yields a flexible polyurethane foam with closed cells that will neither shrink nor swell. A good compression strength is obtained in a very short time.