Because of the need for increased toughness, shackles for most overhead lifting are made from O cast steel
O forged steel
O drop iron
O tempered aluminum

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?