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A foam is a substance formed by trapping pockets of gas in a liquid or solid. A bath sponge and the head on a glass of beer are examples of foams. In most foams, the volume of gas is large, with thin films of liquid or solid separating the regions of gas.
Solid foams can be closed-cell or open-cell. In closed-cell foam, the gas forms discrete pockets, each completely surrounded by the solid material. 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 camping 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. In general, gas is present, so it divides into gas bubbles of different sizes (i.e., the material is polydisperse)—separated by liquid regions that may form films, thinner and thinner when the liquid phase drains out of the system films. When the principal scale is small, i.e., for a very fine foam, this dispersed medium can be considered a type of colloid.
Foam can also refer to something that is analogous to foam, such as quantum foam, polyurethane foam (foam rubber), XPS foam, polystyrene, phenolic, or many other manufactured foams.

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    Replacement foam for rifle cases???

    Ive got a couple of Plano All-Weather cases and need to get some new foam in there. Ive seen only a couple online... but listed just a basic solid foam, no removable pcs like what it comes with, but wanted $36+tax for it. Anyone know of a better replacement option? I dont care if its cut or...
  2. etrain16

    Cutting Foam for Hard Cases, Etc. - Any Secrets?

    I've got 2 SpeedVault SV500 safes in our bedroom. They are great safes, but I'm having one problem with them that I haven't yet solved. The foam inserts need to be cut to fit the guns properly. I've tried cutting them with various knives, but I'm not getting good results - the foam collapses as...
  3. gun.deals

    Pelican 1170 Case With Foam (Black) - $27.33 shipped

    Pelican 1170 Case With Foam (Black) - $27.33 shipped
  4. T

    Composite Stock Filler Material

    What types of materials do the major after-market stock companies fill their stocks with? Specifically composite stock models. I'm looking to make my own composite stock and need a point of reference to begin my research. Thanks in advance
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