Characterization of waxes and fats:

There are two significant criteria for characterization of waxes and fats by DSC:

1. Although melting peak shape of wax and wax formulations can be quite complex, they are much less sensitive than fats to variation in the crystallization condition.

2. The crystallization of waxes is easily nucleated with the result that solidification occurs readily with little or no super cooling. In fact the crystallization peak for most waxes is virtually mirror image to its melting point. Although reading of DSC thermogram and applying to this criterion, we can easily make statement whether the supplied material is wax or fat.

Using differential scanning calorimetry to study the oxidative stability of samples commonly needs an airtight sample chamber. Commonly, such tests are done isothermally (at constant temperature) by changing the sample atmosphere. Primary, the sample is brought to the desired test temperature under an inert atmosphere, usually nitrogen or organ. After that, oxygen is added to the system. Any oxidation in which occurs is observed as a deviation in the baseline. Like analysis can be used to determine the stability and optimum storage conditions of a compound

A more exact application of DSC where DTA cannot be employed is the detection of magnetic transition in the materials. The magnetic transition are of second sequence with ?H=0 but with the maximum heat capacity at the transition temperature. Methods are sensitive to detect these minor variations. A typical DSC curve for a magnetic transition is display in Figure. Similarly glass transition could be detected simply with DSC.