Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by form]
6. [materials by chemical form]
7. compounds (materials)
8. polymers

Anotations

Scope note:

A polymer featuring ether functionality, perfluoropolyether (PFPE) refers to one branch of a family of synthetic lubricants developed by DuPont, the oil form of the line commercially known as Krytox (TM). In a conservation context, it is used primarily for waterproofing stone. Its repellent powers also recommend it as an anti-graffiti agent.