Home >> Materials >> Plastics >> Thermoset Plastics
Thermoset Plastics
Thermoset plastics are permanently hardened through a chemical curing reaction. Once thermoset plastics are set, they have strength that goes head-to-head against metal. Thermoset plastics can’t be remelted or reformed—they’re tough. That makes them fundamentally different from thermoplastics, which soften and remelt with heat.
It’s a distinction that matters. Thermoset’s permanent cross-linked structure gives it superior strength, heat resistance, and dimensional stability. Parts fabricated from thermoset plastics resist mechanical creep, corrosion, and high-voltage breakdown. They can be machined to very tight tolerances. In many cases, these materials offer a lower-cost alternative to metal, without sacrificing performance.
High-Dielectric Strength
Tight-tolerance CNC Machining
ISO 9001 & ITAR Certified
Why Thermoset Plastics Are Used in Demanding Applications
Should you consider using thermoset materials for your applications? Thermoset materials perform in places where many other materials fail. Their cross-linked molecular structure, formed during curing, gives them properties that thermoplastics and metals can’t always match at the same cost.
Important properties of thermoset plastics:
These properties are exactly why thermoset plastics are a preferred material class for electrical insulation components, high-temperature structural parts, and precision-fabricated assemblies. They’re often a top choice across industrial, electrical, defense, and OEM markets.
Common Thermoset Applications at Dielectric Manufacturing
At Dielectric Manufacturing, we use a wide variety of thermoset polymers to fabricate the precision components you need for your application. Here are some of the most common applications where thermoset is the best choice:
We Carry a Wide Variety of Thermoset Polymers
Thermoset plastics are specified across a wide range of demanding applications. Here are some of the most common we see at Dielectric:
The full range of thermoset materials we stock and fabricate is much broader than the highlights above. The chart below shows every thermoset material available through Dielectric Manufacturing, with links to detailed property data for each.
Still not sure which thermoset material is the right choice for your application? Our team can help you select the best option to meet your performance requirements and stay within your budget.
Thermoset vs. Thermoplastic: Key Differences
Understanding the differences between thermoset and thermoplastic materials is important, especially during material selection. Here are the key performance differences between thermoset and thermoplastic, and where each material makes the most sense.
| Thermoset | Thermoplastic | |
|---|---|---|
| Curing | Permanently cross-linked by heat/chemical reaction | Softens and re-melts with heat |
| Heat resistance | Superior — holds shape at high temps | Lower — can deform under sustained heat |
| Strength | Generally higher | Generally lower |
| Recyclability | Not recyclable | Recyclable |
| Machinability | Excellent for tight-tolerance CNC work | Good, material-dependent |
Thermoset Machining Capabilities at Dielectric Manufacturing
Machining thermoset material requires specific expertise. The materials are strong, but they can be abrasive and brittle compared to metals, and sensitive to heat buildup during cutting.
Dielectric Manufacturing’s CNC equipment and experienced machinists can produce thermoset parts that other shops just can’t. Our materials hold tight tolerances on complex geometries across high-mix, low-to-mid volume production runs. They can keep up with your demands.
Thermoset Plastics FAQ
No. The chemical curing reaction that gives thermoset plastics their strength and heat resistance permanently cross-links the polymer chains. Once it’s cured, it can’t be remelted or reformed, so it’s not recyclable. For applications where recyclability is a requirement, there are thermoplastic alternatives that may be worth consideration.
Thermoset plastic offers electrical insulation properties that metals don’t. They’re also corrosion-resistant, lower weight, and in many cases, have a lower per-part cost for precision components. When you need parts where electrical isolation and dimensional stability matter (and conductivity and ductility don’t), thermoset is often the preferred choice.
Yes. Thermoset materials are a perfect match for CNC machining and can be fabricated to very tight tolerances. At Dielectric Manufacturing, we have extensive experience in machining thermoset components, including complex geometries, for customers who need precision parts that other shops just can’t produce.
Thermoset Manufacturing for Parts and Components
When you’re considering thermoset manufacturing components for your next application, 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.
Note: In addition to fabricating parts from thermoset material, we also sell unfinished materials.
