Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. [sodium and sodium compounds]
8. sodium compounds

Anotations

Scope note:

Amorphous sodium polyphosphate used as water softener (marketed in powdered form as Calgon T and other copyrighted names), sequestering agent, and corrosion inhibitor. In conservation, sodium hexametaphosphate is used in the cleaning of wood, stone, textiles, and ceramics.