Reticulated Polyurethane Foam
n A urethane foam of extremely low density, characterized by a three-dimensional skeletal structure of strands with dew or no membranes between the strands, and containing up to 97+% of void space. Such foams are made by treating an open cell foam structure with a dilute aqueous sodium hydroxide solution under controlled conditions so that the thin membranes are dissolved, leaving the strands substantially unaffected. Ultrasonic vibrating is sometimes used to assist the solution process. These foams are used in filters for air conditioners, automobile carburetors, and air-cleaning systems; and in acoustical panels, humidifiers, and various household products.