Rigid

Rigid plastics are subdivided into three sub-categories: Rigid - sheet en Rigid - industrial product Rigid - made by artist
The subcategories overlap. So there are different plastics in several subcategories, for example ‘Epoxy (EP)’can be found in the subcategory Industrial product en bij made by artist.

Rigid - sheet

You cannot (no longer) roll a sheet around a tube, but it is clearly (been) flat.

Rigid - industrial product

The object has been industrially transformed into a 3D object. It has clearly been produced (on a large scale) in a factory.

Rigid - made by artist

The object has been transformed into a 3D object by the artist. It is not industrially produced.