Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [additive and joining processes and techniques]
6. impregnation (saturation of material)

Anotations

Scope note:

An alternative to ethyl silicate surface treatments for consolidation of stone which involves sealing the object or architectural element, dehumidifying it, evacuating the air from around the object, and introducing the agent, which then permeates the stone surface in a vacuum.