Industrial and Manufacturing Systems Engineering (IMSE) 250 Exam 2 Practice Test

Recycling plastics hinges on whether the polymer can be melted and reshaped without breaking down its structure. Thermoplastics can be heated above their melting point and re-molded into new products with only modest changes in properties over many cycles. This allows mechanical recycling to be practical and widespread, so these materials can be collected, melted, and reformed into pellets for new uses.

In contrast, thermosets form crosslinked, permanent structures. Once cured, they don’t melt, so reprocessing them by heating isn’t feasible; recycling typically isn’t mechanical and requires chemical or specialized processes, which are less common.

PLA is a thermoplastic, but it often isn’t accepted in standard recycling streams and can contaminate conventional recyclables if mixed in, so its practical recycling options are more limited. ABS is a common thermoplastic as well, but its recyclability depends on local facilities and processes, and it isn’t as universally easy to recycle as the broader class of thermoplastics.

Thus, the plastic materials that are easier to recycle and reuse are thermoplastics.