Praxair Uruguay, a subsidiary of Praxair, Inc. (NYSE: PX), has signed a 15-year contract to supply oxygen to a new pulp mill complex being built in Punta Pereira, in the department of Colonia, Uruguay. The new facility will be operated by Montes del Plata, a 50-50 joint venture between Arauco of Chile and StoraEnso of Finland and Sweden.