Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. organic material
7. plastic (material)
8. [plastic by property]
9. thermoplastic
10. vinyl
11. vinyl resin
12. vinyl polymers
13. polyvinyl acetal

Anotations

Scope note:

A colorless, flexible thermoplastic resin produced by the condensation of polyvinyl alcohol with formaldehyde that is used as a structural adhesive. In conservation, plasticized polyvinyl formal film has been used to fill losses in ancient textiles.