Hydrophilic Polyurethane Impregnated rubber
Patent No. U.S. 6,541,106 B1
The U.S. Secretary of the Interior, Washington, D.C. has received a patent for a sealing material for sealing water leaks in a water conveyance system caused by a hole in the conveyance system. The sealing material is comprised of a sealing element of a size and shape adapted to be plugged into a hole producing a leak in the water conveyance system. The sealing element is comprised of a porous hydrophilic rubber and a water reactive polyurethane resin impregnated into the pores of the porous hydrophilic rubber such that when the material of the sealing element comes into contact with water, the hydrophilic rubber and the water reactive polyurethane resin swell to cause the material to adhere to portions of the water conveyance system defining the hole producing the leak and to seal the leak.