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2. 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. Medium-density closed-cell spray foam (ccSPF)

3. Foam - Wikipedia

   en.wikipedia.org/wiki/Foam

   In open-cell foam, gas pockets connect to each other. A bath sponge is an example of an open-cell foam: water easily flows through the entire structure, displacing the air. A sleeping mat is an example of a closed-cell foam: gas pockets are sealed from each other so the mat cannot soak up water. Foams are examples of dispersed media.

4. Metal foam - Wikipedia

   en.wikipedia.org/wiki/Metal_foam

   Definitions Open-cell Open-cell metal foam CFD (numerical) simulation of fluid flow and heat transfer on an open cell metal foam. Open-celled metal foam, also called metal sponge, can be used in heat exchangers (compact electronics cooling, cryogen tanks, PCM heat exchangers), energy absorption, flow diffusion, CO 2 scrubbers, flame arrestors, and lightweight optics.

5. Acoustic foam - Wikipedia

   en.wikipedia.org/wiki/Acoustic_foam

   A close-up image of acoustic foam. Acoustic foam is an open celled foam used for acoustic treatment. It attenuates airbone sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1] The energy is dissipated as heat. [2] Acoustic foam can be made in several different colors, sizes and thickness.

6. List of insulation materials - Wikipedia

   en.wikipedia.org/wiki/List_of_insulation_materials

   Closed-cell polyurethane spray foam 2.54: 1 0.97–1.14: 5.5–6.5: 38–45 ... Open-cell polyurethane spray foam 2.54: 1 0.63: 3.6: 25 Cardboard 2.54: 1 0.52–0.7 ...

7. Reticulated foam - Wikipedia

   en.wikipedia.org/wiki/Reticulated_foam

   Reticulated foam is a very porous, low density solid foam. 'Reticulated' means like a net. Reticulated foams are extremely open foams i.e. there are few, if any, intact bubbles or cell windows. In contrast, the foam formed by soap bubbles is composed solely of intact (fully enclosed) bubbles. In a reticulated foam only the lineal boundaries ...