（Laboratory of Cultural Relics Conservation Materials, Zhejiang University, Hangzhou 310027, China）
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DOI:
10.7502/j.issn.1674-3962.2012.11.05
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Abstract:
The reversibility of the preservation materials is often the controversy focus in the field of cultural heritage conservation: what kinds of materials are reversible materials? How to quantitatively express the reversible? Are reversible materials also desirable when penetrated into the microporous of brick, stone, clay，and other porous materials? How to change reversible rate after aging？In order to explore these basic theoretical problems，this work proposes that we can use the “reversible rate” to quantitatively character the reversibility of the preservation materials in the application process and the reversible rate can be measured through the clearance experiment. The reversible rate is experimentally measured by the Paraloid B72, fluorine rubber, acrylic emulsion and epoxy resin on the surface of glazed tiles, glossy marble, Sichuan sandstone, tuff and Shanxi sandstone. The experimental results show that all of these materials has a certain degree of reversibility. The removal rate of the protective materials is inversely proportional with the porosity of the basal substrate, and relates with the removing technology and scavenger species. The ultraviolet aging process is also significantly affecting the removal rate. The measurement technology of the reversible rate may be an important method to study the function and mechanism of cultural relic protection materials.