Polyurethane resin injection, also known as PU injection or grouting, is a waterproofing technique that prevents water from flowing through cracks and voids. This is an effective solution for crack leak sealing in concrete structures, tunnels, dams and mines.

Leaking concrete structures can be permanently repaired by crack injection techniques using polyurethane resin. Polyurethane resin reacts with water to form a watertight foam. Polyurethane resins vary in rigid and semi-rigid, flexible and semi-flexible foam forms. Chemical expansion of the foam is very effective in filling cracks in concrete as the resin reacts with water. Polyurethane resin plays an important role in preserving the concrete and rebar because leaking cracks in concrete walls cause corrosion of the steel and damage the structure.

PURIN offers a variety of polyurethane injection resins for crack injection solutions used in many different areas of application in a variety of structures such as tunnels, dams, mines, including basement walls, water and sewer tanks, manholes, parking garages, and other below grade structures. From fine hairline concrete cracks to large gushing leaks can be sealed with PURINSEAL product lines.

Choosing the right product for the areas of application plays a very important role in a long-lasting crack injection and leak-sealing applications. PURIN offers a wide product range varying degrees of properties such as viscosity, expansion rate, reaction time, flexibility and hardness. Please contact our PURIN technical experts for more information on the best product for your situation.