Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by property]

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by form
6. materials by chemical form

Anotations

Scope note:

General term for distinct substances or compounds, having constant chemical composition and characteristic properties; usually refering to such substances that have been purified or prepared.