CHEMFLEX LV is a single component moisture activated polyurethane low viscosity chemical grout sealant containing prepolymer isocyanates (MDI) and is used to stop water infiltration in concrete structures through cracks and joints. CHEMFLEX LV is a non flammable, V.O.C. compliant grouting material. CHEMFLEX L.V. is a hydrophobic chemical based sealant which can be used above or below grade due to the minimal shrinkage this grout may exhibit.