Many exceptions
(ie,
non-thermal reactions
) :
·
diffusion-controlled
reactions
(very fast)
·
photochemical
reactions
(energy given by light absorption)
·
decomposition due to
phase changes
(eg,
freezing)
·
ointments, suppositories,
creams
,
etc
·
degradation caused by
microbial contamination
·
formulations containing
-
suspending agents;
surfactants;
thickening agents; proteins