Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. organic material
7. plastic (material)
8. [plastic by production method]

Anotations

Scope note:

Plastics formed in an extrusion process, in which a molten polymer is passed from an extruder head and blown into a bubble of uniform film that is then molded, often into food packaging such as bottles for liquid.