Azo-Grout products are based on low viscosity and generate low exothermic reaction temperatures. These quality characteristics ensure better penetration of the polyurethane into the repair area and reduce the amount of stress on the concrete. The low viscosity also allows for an assortment of injection equipment to be used with Azo-Grout ranging from caulk guns to multi-ratio pumps. Azo-Grout products are versatile in the fact that most of the products can be mixed with water in a variety of ratios and still maintain accurate properties to operate as a water stop. Very few materials will use water for a catalyst and then restrain water from further damaging a structure. This is one of the unique qualities of polyurethane-based grouts.