Assessment of Ethyl Silicate Consolidants for Earthen Finishes
SA linear variable differential transmitter measuring the changing height of a treated earthen sample during exposure to fluctuating relative humidity.
The Getty Conservation Institute in collaboration with the Architectural Conservation Laboratory (ACL) of the University of Pennsylvania (UPenn) assessed ethyl silicate–based consolidants and their effect on various clay-based surface finishes with the aim of providing information to conservators on which ethyl silicates are most appropriate for use with specific earthen finishes and under which conditions they can optimally be used.
Investigation at ACL/UPenn explored the behavior of earthen finishes after consolidation with proprietary ethyl silicate–based products when exposed to water in both liquid and vapor form. Results revealed differences in the performance of the ethyl silicates in terms of curing time, expansion and contraction, water repellency, and durability during wet-dry cycling. These differences indicate that the type of ethyl silicate used needs to be considered carefully before administering treatment and that the composition of the treatment material plays an important role in its performance.
Research at the Conservation Institute evaluated the behavior of formulated clay-based finish materials when treated with a selection of popular commercial consolidants. Treated materials were evaluated for appearance, mechanical properties, plasticity, response to water, and environmental durability. Two clay types were used for sample preparation to assess their effect on the performance of ethyl silicate–based consolidants.