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Sealants for Construction - Part III The Different Chemical Types of Construction (and Civil Engineering) Sealants

SpecialChem / Philippe Cognard – Apr 14, 2004

ln this part 3 we will classify and study sealants according to : * their chemical types, such as PU, polysulfides, silicones, acrylics..., * their elasticity which is the most important performance as we have seen in Sealants for Construction Part II, and we will differentiate the caulks ( which cannot withstand deformation ), the plastomeric sealants ( such as butyl, acrylics...) and the elastomeric sealants ( such as polyurethanes, silicones, MS polymers... ), * their form, such as those supplied in cartridges which are extruded on site, the preformed sealants (supplied as dry tapes, ribbons or extruded shapes ), or the hot melt sealants. Traditional caulks Before world war 2 there was no sealants in the way we understand it now: joints between different materials, such as between glass, metals, wood, concrete.. were filled with some traditional caulks, based on oleoresins, such as linseed oil, or bitumen and tar in civil engineering works. These formulations could only withstand a few percent elongation at break, and moreover they had a bad resistance to weathering.

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