Hierarchy classification:

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

Anotations

Scope note:

Plasticizers that are either non-surface active polymers or surface-active substances added to a suspension, usually a colloid, to improve the separation of particles and to prevent settling or clumping. They usually comprise surfactants, but they may also be gases.