Purity of polymorphic form

At this scan rate, the material is unable to recrystallise and only the melting of crystal forms originally present will result. If only one form is found in such a situation it can be concluded that only one form was present to begin with so the material was pure with regard to crystal form. The second derivative trace can help when viewing a melting profile (Section 1.2.5) and in this case helps to show that there is only one transition. 

Commercially available carbairrazepine. Increasing scan rate shows increasing size of major 

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