Thermomechanical analysis (TMA) in a tube-compressive mode can be used to characterize pitch in a reproducible and sensitive
way. In a single experiment, this technique enables simultaneous determination of the glass transition temperature, the softening
temperature and the rheological behaviour of a pitch sample. Results on a typical Australian coal-tar pitch are consistent
with Bingham fluid behaviour above its softening temperature with a yield stress of the order of 100 Pa. In a similar test
a petroleum pitch sample exhibited no yield stress.