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. Thermoset plastics are generally stronger than thermoplastic materials.

Parts made via thermoset manufacturing can be fabricated to very tight tolerances. thermoset plastics - thermoset manufacturingThermoset parts resist mechanical creep and corrosion.

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.

Thermoset Manufacturing for Parts, Components

When you are considering thermoset manufacturing companies, contact us to learn how you can benefit from our approach to custom plastics, using a thermoset plastic material. We have extensive experience manufacturing parts and components made from thermoset materials.

See examples of parts we’ve produced via thermoset manufacturing.

Return to Plastics Main Page.

In addition to fabricating parts from thermoset material, we also sell unfinished materials.

“Their materials and market knowledge is superior.”

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 materials or manufacturing? Call us in metropolitan Milwaukee, Wisconsin, at 800-367-9122, or email