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2. Closed-cell PVC foamboard - Wikipedia

   en.wikipedia.org/wiki/Closed-cell_PVC_foamboard

   Closed-cell PVC foam takes solid shape due to its linear structure. However, due to this structure, it is more brittle than open-celled PVC foam. It is available in densities varying from 3 to 25 pounds per cubic foot (0.048 to 0.400 g/cm 3). [3] It has a low flammability rate. [4]

3. Building insulation material - Wikipedia

   en.wikipedia.org/wiki/Building_insulation_material

   Closed-cell foam is non-porous, and not moisture-penetrable, thereby effectively forming a semi-permeable vapor barrier. (N.B., vapor barriers are usually required by the Building Codes, regardless of the type of insulation used. Check with the local authorities to find out the requirements for your area.) Closed-cell foams are superior insulators.

4. Kayak - Wikipedia

   en.wikipedia.org/wiki/Kayak

   Most kayaks therefore have footrests and a backrest. Some kayaks fit snugly on the hips; others rely more on thigh braces. Mass-produced kayaks generally have adjustable bracing points. Many paddlers also customize their kayaks by putting in shims of closed-cell foam [34] (usually EVA [35]), or more elaborate structures, to make it fit more ...

5. Spray foam - Wikipedia

   en.wikipedia.org/wiki/Spray_foam

   Open cell spray polyurethane foam insulation being applied in wall cavities. Open cell insulation can be crushed in your hand and has a lower insulation value. Closed cell is rigid to the touch and each air cell is completely sealed. While closed cell foam has a higher R-value, it is more costly to buy. [9] Medium-density closed-cell spray foam ...

6. Neoprene - Wikipedia

   en.wikipedia.org/wiki/Neoprene

   The closed-cell form is waterproof, less compressible and more expensive. The open-cell form can be breathable. It is manufactured by foaming the rubber with nitrogen gas, where the tiny enclosed and separated gas bubbles can also serve as insulation. Nitrogen gas is most commonly used for the foaming of neoprene foam due to its inertness ...

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8. Polystyrene - Wikipedia

   en.wikipedia.org/wiki/Polystyrene

   Although it is a closed-cell foam, both expanded and extruded polystyrene are not entirely waterproof or vapor proof. [58] In expanded polystyrene there are interstitial gaps between the expanded closed-cell pellets that form an open network of channels between the bonded pellets, and this network of gaps can become filled with liquid water.

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