Patent No. U.S. 6,506,247 B1
Hercules Chemical Company, Inc. has been granted a patent for a refractory furnace cement that can be formulated to be air settling and substantially free of silica. The composition can be formed with a refractory agent, a rheology modifier, a corrosion inhibitor, a binder such as a sodium silicate, a flocculating agent and various inorganic fillers to promote thermal stability, shelf stability, appropriate setting times and cold mortar strength.