High Temperature Injection Molded Plastics: Guide To


In the manufacturing space, high temperature injection molded plastics stand out for their robustness and versatility. These materials are becoming increasingly significant across various industries, thanks to their ability to withstand extreme temperatures without compromising their structural integrity or performance. 

This guide will explore the applications, benefits, and considerations of using high temperature injection molded plastics, focusing on the offerings by Sable Plastics Group, a noted producer of made-in-the-USA thermoset plastic parts.

What are High Temperature Injection Molded Plastics?

High temperature injection molded plastics are specialized polymers designed to perform in environments where ordinary plastics might degrade. These plastics endure elevated temperatures, making them ideal for high-heat applications.

The primary types of high temperature plastics include:

Polyetheretherketone (PEEK)

Known for its excellent mechanical and chemical resistance properties. It is a semi-crystalline thermoplastic with exceptional mechanical and chemical resistance properties that do not degrade significantly even under sustained exposure to intense heat. PEEK’s characteristics:

Temperature Resistance

PEEK can withstand continuous exposure to temperatures up to 250°C (482°F), and in short durations, it can handle up to 300°C (572°F).

Mechanical Strength

It offers high strength and stiffness along with excellent slide and wear properties.

Chemical Resistance

PEEK is resistant to a wide range of chemicals, including hydrocarbons and organic solvents.


Due to its robustness, PEEK is commonly used in aerospace, automotive, electrical, and medical industries for components like gears, bearings, piston parts, pumps, and compressor plate valves.

Polytetrafluoroethylene (PTFE)

You probably have met it under the name of Teflon. It’s known for its non-stick properties and resistance to heat in the cookware industry.

Temperature Resistance

PTFE can continuously perform at temperatures up to 260°C (500°F) and is capable of tolerating brief spikes in temperature even higher without losing its properties.

Non-stick Properties

It is perhaps best known for its slippery surface, which is why it’s widely used in cookware and applications requiring non-stick surfaces.

Chemical Resistance

PTFE is almost completely inert, making it ideal for use in applications involving aggressive and corrosive chemicals.


Besides cookware, PTFE is used in a variety of applications including seals, bearings, slide plates, and linings in the chemical processing industry.

Polyimide (PI)

It is a polymer of imide monomers, noted particularly for its ability to maintain excellent mechanical properties at intense heat.

Temperature Resistance

Polyimide can operate effectively at temperatures up to 350°C (662°F) and sometimes higher, depending on the formulation.

Electrical Insulation

It has excellent electrical insulation properties over a wide range of temperatures and frequencies.

Thermal Stability

It offers superior thermal stability, which is crucial for applications in the aerospace and electronics industries.


Polyimide is extensively used in the electronics industry for flexible printed circuits and as an insulating film in cables and other components. It is also used in the aerospace industry for thermal blankets and other intense heat insulation applications.

Applications in Various Industries

High temperature injection molded plastics are critical in sectors where durability and thermal stability are paramount. Key applications include:


Components such as seals, gaskets, bushings, and bearings that must resist extreme temperatures and harsh conditions.


Under-hood components like connectors, ignition parts, and sensor housings.


High-performance parts that require excellent electrical insulation properties.


Devices that need to endure the extreme heat of autoclave sterilization.


And many other industries. 

Why Choose Sable Plastic Group?

A Customer-Centric Approach

At Sable Plastic Group, the focus is on delivering exceptional customer service. We take pride in understanding the specific needs of clients, ensuring that the final products are tailored to meet those requirements precisely.

Made-in-the-USA Quality

All our high temperature plastic parts are made in the United States, adhering to the highest standards of quality and craftsmanship. This not only supports the local US economy but also provides customers with the confidence that they are receiving a product that meets rigorous standards. Made in the USA quality!

Key Benefits of High Temperature Injection Molded Plastics


High temperature plastics are designed to withstand extreme conditions without suffering degradation. This durability extends to resistance against melting, warping, or losing structural integrity under high thermal stress. Such resilience ensures that components made from these materials last longer and require less frequent replacements, which is particularly crucial in industries where longevity and reliability are paramount.

Superior Performance

Unlike standard plastics, high temperature plastics maintain their mechanical and structural properties even when exposed to high thermal environments. This is essential for applications in sectors such as aerospace and automotive, where materials must perform reliably under the stress of extreme heat generated by engines, machinery, and friction.


While the initial cost of high temperature plastics might be higher than that of standard plastics, their long-term benefits justify the investment. The durability and reduced maintenance needs lead to lower lifecycle costs. Additionally, their ability to perform under challenging conditions can prevent costly failures and downtime in industrial processes.

Chemical Resistance

Many of these kinds of plastics are highly resistant to chemicals, including acids, alkalis, organic solvents, and other corrosive materials. This chemical inertness makes them suitable for use in harsh environments such as chemical processing plants, pharmaceutical production, and any setting where chemical exposure is a routine part of operations.

Improved Safety and Compliance

The ability of high temperature plastics to resist combustion and maintain integrity under fire conditions enhances safety in critical applications. Their thermal stability contributes to better fire safety profiles, making them compliant with strict fire safety standards required in many industries, including transportation and construction.

Electrical Insulation Properties

Some of these types of plastics, such as polyimides, offer excellent electrical insulation even at elevated temperatures. This characteristic is invaluable in the electronics industry, where these plastics are used in components like connectors, insulators, and other parts that must both insulate and withstand high thermal loads.

Light Weighting

These kinds of products often replace metals in many applications due to their lightweight nature. This substitution can significantly reduce the overall weight of a product or assembly, leading to increased efficiency, especially in automotive and aerospace applications where weight reduction is continuously pursued for fuel efficiency and performance enhancements.

Considerations When Choosing Plastics

Temperature Requirements

It’s crucial to choose a plastic that can handle the maximum temperature of the application.

Mechanical Loads

Evaluate the mechanical stresses that the part will need to withstand.

Environmental Conditions

Consider factors like exposure to chemicals or UV light.


High temperature injection molded plastics are an excellent choice for applications requiring durability and performance in extreme conditions. Sable Plastics Group offers a range of high-quality, American-made thermoset plastic parts that cater to a wide array of industries. 

By choosing the right type of plastic and partnering with a reliable manufacturer, companies can significantly enhance the performance and reliability of their products. This guide aims to assist buyers in making informed decisions when selecting high temperature injection molded plastics for their specific applications. Sable Plastics Group has the expertise and products to meet your needs.

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