热塑性塑料受热时软化或熔化，冷却后硬化、定型，冷热过程中不发生化学变化

When softened or melted thermoplastic heat hardening, no chemical change shape, during cold After cooling, heating, and whether and how many times it is repeated, this performance are maintained, and thus a more simple molding process, and has high mechanical properties , but poor heat resistance and rigidity.

Thermoplastic plastic softened or melted when heated, after cooling hardening, shaping, heat and cold process does not occur chemical changes, and no matter how many times heating and repeated, to maintain this performance, so processing molding is simple rife and has a higher mechanical properties, but heat resistance and rigidity is poor.

Thermoplastics soften or melt when heated, harden and set after cooling. There is no chemical change in the process of cooling and heating. No matter how many times they are heated and repeated, they maintain this property. Therefore, the processing and molding is simple and has high mechanical properties, but the heat resistance and rigidity are poor.