Thermoset, or thermosetting, plastics are synthetic materials that undergo a chemical change when they are treated, creating a three-dimensional network.  After they are heated and formed, these molecules cannot be re-molten and reformed.

More Information on thermosets

  • History

    The first commercial thermoset plastic was developed by Dr. Leo Baekeland in 1909.
    It was a phenolic material trade named Bakelite. This thermoset material offered the new benefit of being firmly set -- not changing its shape, even under heat and pressure.
    Bakelite was used extensively as an insulating material for handles on cookware and irons, and later found its way into applications such as telephone earpieces, electrical housings and connecting blocks. It was also a key ingredient in many of the weapons used in World War II.

    Since that time, different thermoset types made their entry (see: types of plastics).

  • Properties

  • Processes

  • Applications

  • Recycling

Types of Plastics