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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. Polystyrene - Wikipedia

   en.wikipedia.org/wiki/Polystyrene

   According to the EPS-IA ICF organization, the typical density of EPS used for insulated concrete forms (expanded polystyrene concrete) is 1.35 to 1.80 pounds per cubic foot (21.6 to 28.8 kg/m 3). This is either Type II or Type IX EPS according to ASTM C578. EPS blocks or boards used in building construction are commonly cut using hot wires. [54]

4. Foamcore - Wikipedia

   en.wikipedia.org/wiki/Foamcore

   Foamcore, foam board, or paper-faced foam board is a lightweight and easily cut material used for mounting of photographic prints, as backing for picture framing, for making scale models, and in painting. It consists of a board of polystyrene foam clad with an outer facing of paper on either side, typically white clay-coated paper or brown ...

5. Spray foam - Wikipedia

   en.wikipedia.org/wiki/Spray_foam

   As a result of the high thermal resistance of the gas, spray polyurethane insulation typically has an initial R-value around R-3.4 to R-6.7 per inch. [6] In comparison, glass wool typically has an R-Value of only R-3 to R-4 per inch. [7] Foam insulation blocks all three forms of heat transfer: Conductive heat transfer

6. Foam peanut - Wikipedia

   en.wikipedia.org/wiki/Foam_peanut

   Foam peanuts are very light (usually around 3 grams per litre/0.17 to 0.2 lb per cu ft) and easy to use. Polystyrene peanuts may be used and reused many times with little or no loss in protection for the product shipped. They may be reused and recycled at many packing and shipping stores.

7. Rivet - Wikipedia

   en.wikipedia.org/wiki/Rivet

   A "dash 3 dash 4" (XXXXXX-3-4) designation indicates a 3 ⁄ 32-inch diameter and 4 ⁄ 16-inch (or 1 ⁄ 4-inch) length. Some rivets lengths are also available in half sizes, and have a dash number such as –3.5 (7 ⁄ 32 inch) to indicate they are half-size. The letters and digits in a rivet's identification number that precede its dash ...