RONALD M. HECK is a principal scientist and research manager responsible for developing new environmental catalysts for Engelhard's worldwide customers. ROBERT J. FARRAUTO is a research fellow with Engelhard involved in all aspects of catalysis for the environmental, chemical, and petroleum industries. SURESH T. GULATI is a research fellow at Corning. His research interests include the behavior of brittle materials subjected to mechanical and thermal loads, the design of glass and ceramic products, and strengthening methods for glasses.