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Sealants for Construction - Part I General Information, Movements of Construction Elements, Definition of Terms, Requirements

SpecialChem / Philippe Cognard – Feb 18, 2004

Movements between elements of the construction and needs for improved sealants Before World war 2, buildings were built with traditional materials: concrete, bricks, sometimes wood, steel frames in the american skyscrapers, the construction was homogeneous ( the structure was made of a single material ), and therefore there was not much movements between 2 different elements of the structure. Besides this the only existing sealing compound were based on oleoresins or bitumen which had very low elongation or elasticity and poor aging so that it cracked if elongation of the gaps between elements exceeded a few percent. Immediately after the war, American and shortly after the European started to use many prefabricated parts in buildings: sandwich panels ( made of various materials: steel, aluminum, glass panels, plywood for the facings and foam insulation inside for the core ), prefabricated windows ( made of metals, wood and later PVC ), prefabricated doors, partitions ( often made of plasterboard ), prefabricated concrete slabs for floors and exterior walls, etc…

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