Determination of drop melting point of wax by differential scanning calorimetry
The drop melting point of wax was de-termined by using differential scanning calorimetry(DSC),and the effects of heating(cooling)rate and heating times on the test results were studied.The repeatability,accuracy and reproducibility of DSC method for measuring wax drop melting point were investigated under the optimal conditions.The re-sults showed that the inflection point temperature at the end of the melting curve was determined to be the drop melting point of the DSC method.The opti-mal conditions for measuring the drop melting point of wax by DSC method were as follows:the first heat-ing(cooling)rate was 20 ℃/min,the second heating rate was 5 ℃/min.The repeatability of the method was 0-0.2 ℃,and the reproducibility was 0-1.1 ℃,which both met the requirements of GB/T 8026-2014.
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