Thermoset Materials

Thermoset materials are commonly used for electrical insulation, or for components used in extreme environments. Thermoset plastics withstand high temperatures without losing their shape or structural integrity. A chemical reaction takes place during the manufacturing process, creating the permanently-hard nature of the material. Thus, parts made with thermoset plastics can be fabricated to very tight tolerances.

thermoset plasticsThermoset parts also resist corrosion and mechanical creep.

In some cases, thermosetting polymers can be a lower-cost option to metal for precision parts.

These plastics are not recyclable because – as their name implies, once heated, the material is set and cannot be remelted for re-forming.

Wide Variety of Thermoset Polymers

At Dielectric Manufacturing, we use a wide variety of thermoset polymers to fabricate components with great precision.

Some of the common thermosets we handle are fish paper, glass epoxy (including fire-resistant versions) and glass cloth phenolics, canvas and Micarta laminates, and polyurethanes.

Thermoset Plastic Materials

Click on any thermoset material in the chart below to learn about its properties.
Fish Paper (Vulcanized Fiber)Glass Cloth Phenolic Resin (G3)Glass-Melamine Laminate (G-5, G9)
Glass Silicone (G7)Glass Epoxy (G10, FR4)Glass Epoxy (G11)
Glass Polyester (GPO-1, GPO-2,GPO-3)Linen (LE)Nomex® (Synthetic Aromatic Polyamide Polymer)
Transformer Board (Press Board T-IV)

See thermoset plastic material cost comparisons.

When you are considering plastic manufacturing companies, contact us to learn how you can benefit from our approach to custom plastics, using a thermoset plastic material.

See examples of parts we’ve manufactured using thermoset plastics.

Return to Plastics Page.

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Dielectric Manufacturing Knowledge Base


Learn about thermoset polymer material properties, see answers to frequently asked questions about parts and assemblies, and get other information on component fabrication and machining.

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Need more information about thermoset plastic materials for component fabrication and assembly? Call us in metropolitan Milwaukee, Wisconsin, at 800-367-9122, or email