ThispublicationpresentstheproceedingsofICPMSE-7, theSeventhInternational Conference on Protection of Materials and Structures from Space Environment, held in Toronto May 10 13, 2004. The ICPMSE series of meetings became an important part of the LEO space communitysinceitwasstartedin1991.Sincethen, themeetinghasgrownsteadily, establishing itself as the only North American event covering the various aspects of materials protection in LEO and attracting a large number of engineers, - searchers, managers, and scientists from industrial companies, scienti?c insti-...