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  2. Foam rubber - Wikipedia

    en.wikipedia.org/wiki/Foam_rubber

    Foam rubber yoga mat. Foam rubber (also known as cellular rubber, sponge rubber, or expanded rubber) is rubber that has been made with a foaming agent so that its structure is an air-filled matrix. Commercial foam rubber is generally made of synthetic rubber, natural latex, or polyurethane. Latex foam rubber, used in mattresses, is well known ...

  3. Cross-linked polyethylene - Wikipedia

    en.wikipedia.org/wiki/Cross-linked_polyethylene

    A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.

  4. Polyurethane - Wikipedia

    en.wikipedia.org/wiki/Polyurethane

    Polyurethane foam (including foam rubber) is sometimes made using small amounts of blowing agents to give less dense foam, better cushioning/energy absorption or thermal insulation. In the early 1990s, because of their impact on ozone depletion , the Montreal Protocol restricted the use of many chlorine -containing blowing agents, such as ...

  5. Ethylene-vinyl acetate - Wikipedia

    en.wikipedia.org/wiki/Ethylene-vinyl_acetate

    EVA is one of the materials popularly known as expanded rubber or foam rubber. EVA foam [3] [4] [5] is used as padding in equipment for various sports such as ski boots, bicycle saddles, hockey pads, boxing and mixed-martial-arts gloves and helmets, wakeboard boots, waterski boots, fishing rods, and fishing-reel handles.

  6. Cross-link - Wikipedia

    en.wikipedia.org/wiki/Cross-link

    In chemistry and biology, a cross-link is a bond or a short sequence of bonds that links one polymer chain to another. These links may take the form of covalent bonds or ionic bonds and the polymers can be either synthetic polymers or natural polymers (such as proteins ).

  7. Vulcanization - Wikipedia

    en.wikipedia.org/wiki/Vulcanization

    These bridges contain between one and several atoms. The number of sulfur atoms in the crosslink strongly influences the physical properties of the final rubber article. Short crosslinks give the rubber better heat resistance. Crosslinks with higher number of sulfur atoms give the rubber good dynamic properties but less heat resistance.