ALL ‘plastics’ are generally divided into two groups: the ‘thermoplastics’, which are formed by heating, can be re‐heated after forming, and re‐formed almost ad lib, such as celluloid, xylonite, rhodoid, cellophane, and perspex; and the ‘thermosetting plastics’, which are also formed by heating but cannot yet be re‐formed by the application of heat or any other means, probably the best‐known example of which is the thermosetting variety of bakelite.
Fitzgerald‐Lee, G. (1947), "A Survey of Plastic Materials for Students: A Guide to their Manufacture, Characteristics, Properties and Uses", Aircraft Engineering and Aerospace Technology, Vol. 19 No. 9, pp. 291-297. https://doi.org/10.1108/eb031548
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