curing agent for concrete MRK-20(Sodium) curing agent for concrete MRK-21(Potassium) PictureDescriptionFeature and function ... different according to different cement grade.Merrock’s curing agent can react to the concrete, harden and seal ... gym, hospital, community, Brand monopolization, factory, urban construction, road and bridge and logistics center etc. place.Concrete curing agentMRK ...