William J. Fenlon, is Senior Engineer in the Chemical Property Evaluation Section of the Health and Environment Laboratories, Eastman Kodak Company. He holds a B.S. degree in Physics from St. John Fisher College, Rochester, NY. He is a member of AIChE and NATAS, as well as current chairman of ASTM subcommittee E27.02 on the thermal stability of chemicals. He is also chairman of an ASTM task group on adiabatic calorimetry under E27.02.