About chemical composition, A classification of 5.1 is good suggestion. As far as the manufacturing process or material properties , I don't think it's right. This is the definition of thermoplastic
A thermoplastic is a class of polymer that can be softened through heating and then processed using methods such as extrusion, injection moulding, thermoforming and blow moulding.
Thermoplastics harden once cooled and do not show any changes in chemical property after being heated and cooled multiple times, making them easily recyclable.
