Round Robin Test on Validation of Cyclohexane as a Reference Material for Calibration of Differential Scanning Calorimeters

Abstract

Working Group on Standardization in JSCTA conducted a round robin test (RRT) on temperature and enthalpy of phase transition of cyclohexane for validation as a reference material for calibration of DSC in low temperature. Nineteen organizations participated in the RRT. Extrapolated onset temperatures, peak temperatures and enthalpies of solid-solid phase transition and fusion were reported. In all results, variation among laboratories is larger than that within each laboratory. This result indicates that reproducibility of temperatures and enthalpies of phase transitions of cyclohexane by each laboratory are good, but some of the participants have biases in the measurement results. Cyclohexane is valid for calibration of DSC because of its good repeatability of temperatures and enthalpies of phase transitions. It is possible for DSC results to be more accurate from appropriate calibration by using cyclohexane.