Disadvantages
Relatively poor reproducibility because of the dependence on accurately reproduced heating profiles
and the use of very small samples.
Evolved gas analysis (EGA) is based on the study of gases or volatile breakdown products emitted by a
sample on heating. The identity and properties of the volatile materials emitted serve as a basis for the
analysis of the sample. One particular technique of EGA which has attracted sub-
Figure 11.21
(a) Pyrogram of polystyrene cement.
(b) Mass spectrum of peak 36 from
polystyrene cement and its first library fit: 3-isothiocyanatopropene.