CARBON DIOXIDE BLASTING - with dry Ice as Blasting Media

Blasting with carbon dioxide is a technology that since the mid- 1940s and onwards has been developed for the industry for the finishing of different surfaces. The technique however, has not until the end of the 1970 and 80's come to play any important role in the industry, and only in recent years has this method come to be used in conservation activities. Traditional blasting media and dry ice functions partly under the same conditions, a difference however, is that the carbon dioxide sublimates after use, this consequently results in no generated waste in the form of spent blasting media except for removed surface layer. The purpose of this paper is to provide an overview of how the blasting technique with solid carbon dioxide works, its different advantages and disadvantages, and how it is used in the restoration and preservation works in Sweden and abroad. The essay begins with a simple review of traditional blasting techniques and media to aid the reader's understanding of blasting, and highlight differences and similarities between the different systems. The essay is primarily a literature review in which I gratefully used the work of others. A simple case study has also been carried out in cooperation with the Gothenburg-based blasting company IS_AB , ISBLÄSTRINGSAKTIEBOLAGET GOTHENBURG . The purpose of this case study was to investigate whether carbon dioxide blasting technique is suitable for stone conservation, where the goal is to remove various types of unwanted coatings and finishes such as wax, different types of doodles and such. Besides using solid carbon dioxide, carbon dioxide is used in liquid and supercritical state in the industry and in the conservation world, these techniques comes because of limited space, only to be presented in the chapter 10- further researchUppsats för avläggande av filosofie kandidatexamen i Kulturvård, Konservatorsprogrammet 15 hp Institutionen för kulturvård Göteborgs universitet 2014:4