|Polymer materials can have a change in physical properties at certain temperatures not attributed to melting. The polymer softens or changes from a relatively hard, brittle state to a rubber like state. The temperature at which this occurs is referred to as the glass transition temperature, Tg. The following table lists the Tg (oC) of some common polymers.|
|polyvinyl chloride (PVC)||80|
Carlos J. Hilado, "Flammability Handbook for Plastics", Technomic Publishing
Malcolm P. Stevens, "Polymer Chemistry, An Introduction", Oxford Press, 3rd Edit.