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Explanation: This is what is used to refer to resins that cannot change shape once heat has been applied to them. I still remember this from my days in university.
This is taken from the second reference:
"Essentially, there are only two forms of plastic, the most common by far today being the thermoplastic variety, partly because it can be re-melted and re-used. Examples are Styrene, Vinyl, ABS and acrylic. These are relatively modern creations. The other form of plastic is the thermosetting variety - this can only be used once. The application of heat first softens the plastic but the polymers then cross-link and harden permanently. In the hardened state, the plastic produced is generally heavy, rigid, tough but rather brittle. Bakelite (Phenol Formaldehyde) is the most famous example of thermosetting plastic and was arguably the very first successful fully synthetic plastic."
... of a metallic holder made of steel, a sleeve made of plastic glass on which an anti-friction
layer based on thermo-rigid resin with polytetrafluoroethylene or ... www.icmet.ro/nt.htm - 14k - Cached - Similar pages