Differential
scanning calorimetry (DSC) is a common industry tool
used in the assessment of thermal stability of materials. Despite
widespread use of DSC for thermal stability hazard evaluation, mistakes
in testing methodology or interpretations of data are common. To avoid
these issues, a standard operating procedure and list of common practices
utilized within our Corteva Agriscience Reactive Chemicals (RC) group
is presented in this manuscript. Emphasis within our RC program is
placed on device calibration and maintenance, selection of the appropriate
sample container, and a unique sample preparation methodology. The
use of glass capillary and glass ampoule sample containers for
DSC testing is outlined, along with the unique flame-sealing procedure
utilized to protect the sample. The results of the glass sample containers
using di-tert-butyl-peroxide in toluene compared
to gold pan are presented showing the effects that sample containers
can have on results. Additionally, glass ampoule sample containers,
containing ethylene glycol, are used in DSC testing to show their
effectiveness for examining a sample’s oxidative nature. A
discussion of the issues and shortcomings of the commonly used aluminum
pans, for use with organic samples particularly, is also presented.
All this DSC testing information provides insight into our group’s
ability to work on a diverse array of samples and generate quality
data for understanding the thermal stability hazards present within
our company.