PU Injection Resin

The polyurethane (PU) injection resin is composed of dosage A, which is a special polyester compound, and dosage 8, which is a primarily poly-isocyanate compound. Our PU resin product, named NPU, comes in two types which are the general type and the water reaction type. The general type features not only 10-12 times of free foaming after mixing, but also an adjustable reaction starting time from 15 to 65 seconds. The water reaction type basically does not undergo any foaming until hitting the water, allowing for the extremely high strength surroundings of injection conduit or excavation face. When it comes to hit the underground water, it undergoes 3-4 times foaming which cuts water ingress into the tunnel. Same as our NSR, the NPU contains non-toxic components, remaining stable and non-dissolvable in running water.