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. [fluorine and fluorine compounds]
8. fluoride

Additional parents:

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

Anotations

Scope note:

A colorless corrosive gas, the hydride of fluorine and an extremely powerful halogen acid, hydrogen fluoride is used as a catalyst and a fluorinating agent. Its chief use is in making fluorine-containing refrigerants such as freons. In a conservation context, hydrogen fluoride is considered as an atmospheric pollutant which damages metal structures, and buildings or monuments made of limestone.