THE DEVELOPMENT OF A STANDARD METHOD FOR DETERMINING OXIDATION INDUCTION TIMES OF HYDROCARBON LIQUIDS BY PDSC

The use of oxidation induction times (OITs) of hydrocarbon fluids in p redicting oxidative stability has long been of interest to the thermal science community. This statistical study is based on previous work w here parameters such as heating rate, temperature, pressure, and sampl e size were optimized. Here, two reference oils. A and B, and two proc edures were investigated and compared on the basis of OIT variability. Calorimeter pan types were also compared. The pans were all made of a luminum but differed in shape, size, surface topology, and contaminati on species. The effects of these variables on OIT were investigated, a nd pan characteristics were studied using scanning electron microscopy and energy dispersive X-ray spectroscopy. This study will provide spe cific parameters to enhance data quality, a simple production method t hat is easy to implement and data that are easy to interpret. Finally, a precision and bias statement of the final protocol will be develope d through a national ASTM round-robin study.