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Foams as cores of sandwich composites. Part 2. Special foams

SpecialChem / Jan 20, 2004

Generally, the properties of the polyethylene foams used as cores are: * Densities from 25 kg/m3 up to 330 kg/m3. * Semi-rigid to flexible. * Closed cells. Examples of applications: * Panels and sandwich structures for protection of wellhead of oil. * Multi-layer composites for damping, sometimes in combination with polypropylene foam. Some helmets, for example, are made of thermoplastic skins and a core of one layer of PE foam with, eventually, a second layer of polypropylene foam. * Crosslinked or linear. Often, the crosslinking improves the mechanical properties and chemical resistance. Polyethylene foams have: * Insulating and damping properties. * Correct mechanical characteristics. * A low absorption and permeability to the water or the moisture and an excellent hydrolysis behaviour. * A naturally low fire resistance that can be improved by an adequate formulation. An interesting development started with Neste and Norsk Hydro is a multi-layer coating for the insulation of high deep-water pipelines.

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