Thermoset Materials

Thermoset materials are commonly used for electrical insulation, as the materials 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 plasticsIn some cases, thermosets can be a lower-cost option to metal for precision parts.

Thermosets also resist corrosion and mechanical creep.

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

At Dielectric Manufacturing, we use a wide variety of thermoset plastics to fabricate components with great precision. Some of the common thermoplastics we handle are fish paper, glass epoxy (including fire-resistant versions) and glass cloth, canvas and Micarta laminates.

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 plastics.

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

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Dielectric Manufacturing Knowledge Base


Learn about thermoset plastic 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