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2. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Solid-core – Can consist of low-density particle board or foam used to completely fill the space within the door. Solid-core flush doors (especially foam-core ones) are commonly used as exterior doors because they provide more insulation and strength. Skin – The front and back faces of the door are covered with HDF/MDF skins.

3. Sandwich-structured composite - Wikipedia

   en.wikipedia.org/wiki/Sandwich-structured_composite

   The core material is normally of low strength, but its greater thickness provides the sandwich composite with high bending stiffness with overall low density. Open- and closed-cell-structured foams like polyethersulfone , polyvinylchloride , polyurethane , polyethylene or polystyrene foams, balsa wood , syntactic foams , and honeycombs are ...

4. Structural insulated panel - Wikipedia

   en.wikipedia.org/wiki/Structural_insulated_panel

   A structural insulated panel, or structural insulating panel, (SIP), is a form of sandwich panel used as a building material in the construction industry. SIP is a sandwich structured composite , consisting of an insulating layer of rigid core sandwiched between two layers of structural board.

5. Sandwich panel - Wikipedia

   en.wikipedia.org/wiki/Sandwich_panel

   The core is commonly low-density polyethylene (PE), or a mix of low-density polyethylene and mineral material to exhibit fire retardant properties. [ 10 ] 3A Composites (formerly Alcan Composites & Alusuisse) invented aluminium composites in 1964 - as a joint invention with BASF- and commercial production of Alucobond commenced in 1969.

6. List of polyurethane applications - Wikipedia

   en.wikipedia.org/wiki/List_of_polyurethane...

   Industrial Insulation. Rigid polyurethane foam is used in various industries to provide thermal insulation to installations and pipes. In particular, the piping for district heating systems in Europe is primarily insulated using a pre-insulated pipes sandwich assembly composed of a steel heat service pipe, an insulating layer (polyurethane foam) and a polyethylene (PE) casing, which are bonded ...

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