Why are thermoplastics generally easier to recycle than thermosetting plastics?

Thermoplastics are generally easier to recycle than thermosetting plastics because of their fundamental molecular structure and ability to be reprocessed.12

The primary differences include:

• Molecular Structure: Thermoplastics consist of individual molecules that remain separate and can flow past one another. This allows them to be repeatedly heated, melted, and reshaped into new forms.13
• Thermoset Limitations: During their initial manufacturing, thermosets undergo a chemical reaction that creates an infusible, insoluble network, effectively turning the entire object into one large molecule. Because of this cross-linked structure, they cannot be remelted or reprocessed upon reheating; attempting to do so typically only breaks the material down.13

Consequently, while thermoplastics can be remelted and reformed into new products, thermosets are generally limited to being ground or shredded for use as fillers or insulation.3