PlastXnow Explains – High-Performance Plastics  Properties, Materials, and Applications

High-performance plastics are characterized by their exceptional mechanical, thermal, and chemical properties. They are designed for demanding applications and are widely used in the automotive, medical technology, and electronics industries. 

High-performance plastics are not just plastics—they represent the premier class of plastics. Their unique properties, such as high temperature and chemical resistance, open up new possibilities and significantly improve the efficiency and safety of products. In this article, we take a closer look at the special characteristics of high-temperature plastics, their versatile applications, and the challenges involved in processing and recycling them. 

What are high-performance plastics?

High-performance plastics are a special class of thermoplastics characterized by exceptionally high mechanical, thermal, and chemical resistance. They retain their properties even under extreme conditions such as high temperatures, exposure to chemicals, pressure, or mechanical stress.

Compared to conventional plastics, high-performance polymers offer improved performance in demanding environments and under extreme conditions. When it comes to engineering plastics, they differ in terms of temperature resistance, mechanical performance, and price. High-performance plastics are designed for more extreme operating conditions, while engineering plastics are also found in everyday applications.

Because of their properties, these materials are also referred to as high-performance polymers, high-performance thermoplastics, high-temperature plastics, or high-tech plastics.

Properties of High-Performance Plastics

High-performance plastics are a subset of thermoplastics. This classification is also reflected in their property profile. However, compared to standard thermoplastics and engineering thermoplastics, they are in a league of their own—particularly in terms of temperature resistance, chemical resistance, and mechanical properties.

Key features include: 

• Temperature resistance: They can withstand high temperatures, often above 150 °C, without losing their physical properties.
• Mechanical strength: They have high tensile, compressive, and flexural strength, making them ideal for structural applications.
• Chemical resistance: High-performance plastics are resistant to aggressive chemicals, oils, and solvents.
• Low moisture absorption: They are less prone to absorbing moisture, which optimizes their performance in humid environments.
• Good insulators: Many of these plastics are extremely effective electrical and thermal insulators.

Thanks to their combination of strength, stability, and durability, high-performance plastics are used in industries that require long-lasting materials capable of withstanding extreme conditions. Industry-specific innovations in materials science continue to drive the development of high-performance plastics to meet the demands of modern technological applications.

An Overview of Key Figures

While there is no exact number indicating how many high-performance plastics exist, in practice, there are generally considered to be about 10 to 20 established high-performance polymers that are industrially relevant. Among the most important are polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), and polyphenylene sulfide (PPS).

Polyetheretherketone (PEEK)

This high-performance thermoplastic is best known for its exceptional strength, stiffness, and heat resistance. It is chemically resistant to a wide range of acids, alkalis, and solvents, making it ideal for demanding environments. 

PEEK can withstand high temperatures of up to 260 °C without losing its structural properties. Because of these properties, PEEK is one of the plastics frequently used in the aerospace, automotive, and medical technology industries.

Polytetrafluoroethylene (PTFE)

The fluoropolymer PTFE (Polytetrafluoroethylene), also known by the brand name Teflon, is characterized by its outstanding chemical resistance and extreme temperature tolerance, as it can withstand temperatures ranging from -200 °C to 260 °C. 

PTFE is also non-stick and has excellent dielectric properties, making it widely used in electrical insulation materials and non-stick coatings. Due to its versatility and durability, PTFE is the plastic of choice in environments where other plastics would fail.

Polyphenylene sulfide (PPS)

PPS is known for its excellent chemical resistance and thermal stability. This high-performance polymer can withstand temperatures of up to 240 °C while maintaining its structural integrity. 

PPS also offers excellent dimensional stability and low moisture absorption, making it ideal for use in high-precision components. Because of these properties, PPS is a popular plastic in the automotive and electronics industries. Its inherent flame resistance also makes it an attractive choice for applications that must meet strict fire safety requirements.

What other high-performance plastics are there?

• Polyimides (PI) are heterocyclic polymers that are stable up to 550 °C. They offer excellent chemical resistance and are suitable for use as components in mechanical engineering (valves, bearings) and in electrical engineering for coil forms, as well as for cable insulation and as substrates for printed circuit boards.
• Another class of materials, polyetherimides (PEI), has a lower softening point (approximately 360 °C) and can be processed using standard plastics industry processes.
• Liquid-crystal polymers (LCPs) are frequently used in electronics because of their good processability and strength.
• Polyaryletherketones (PEKK) are characterized by exceptional mechanical, thermal, and chemical properties and are therefore used in numerous industries and applications.
• Another important type of fluoropolymer is perfluoroalkoxylalkane (PFA), which can withstand temperatures up to 260 °C. Important: However, fluoropolymers are classified as high-performance plastics only in certain cases.
• Polysulfone (PSU) is an amorphous plastic with high transparency and good impact strength. It can withstand temperatures up to about 160 °C and offers good hydrolytic stability, which is why it is frequently used in medical technology and food processing. 

IN DETAIL

Comparison of High-Performance Plastics: PEEK, PPS, and PSU
 

Source: martanplastics.com

How can high-performance plastics be processed?

High-performance plastics can be processed using a variety of methods that are specifically tailored to their unique properties and requirements. Here are the most common processing methods:

• Injection molding is widely used and enables the production of precise and complex components in large quantities. Especially when working with high-performance polymers, the injection molding machines must withstand high temperatures.
• In the extrusion process, plastic pellets are heated and forced through a shaping die to produce continuous shapes such as tubes or profiles. This technique is particularly well-suited for thermoplastics.
•  Pressing and sintering is a specialized manufacturing process used primarily for polymers that are difficult to process by melting. In this process, plastic powder is pressed into a mold under high pressure and then compacted in an oven at a temperature below (or slightly above) the melting point.
• In thermoforming, a plastic sheet is heated and drawn over a mold to create large 3D structures. This method is less common with high-performance plastics, but is used for certain applications.
• High-performance polymers can also be machined by turning, milling, and drilling. These techniques are often used in the manufacture of custom-made or precision components.
• Additive manufacturing of heat-resistant plastics enables the production of complex, lightweight, and heat-resistant components (up to >260°C) using FDM/FFF or SLS processes. 

Each of these methods requires specific adjustments to the machinery and processes in order to meet the high demands of the materials.

Areas of Use and Applications

High-performance plastics are used in applications where components must withstand very high temperatures, heavy mechanical loads, or corrosive chemicals. They often replace metals because they are lighter and corrosion-resistant.

High-performance plastics are primarily used in high-tech industries such as aviation, automotive manufacturing, electronics, medical technology, and mechanical engineering, where materials must be particularly durable and temperature-resistant.

What are the most important selection criteria?

When selecting high-performance plastics, it is important to ensure that the plastic meets the requirements of the specific application. The most important selection criteria are:

Temperature Resistance

• maximum continuous operating temperature
• What to Do When Temperatures Rise Very High for a Short Time
• Heat-Forming Resistance

The plastic must retain its properties even at high temperatures.

Mechanical Properties 

• Strength
• Stiffness
• Toughness
• Wear resistance

These properties determine how well the plastic withstands stress, friction, or pressure.

Chemical Resistance (to)

• Acids
• Lye
• Solvent
• Oils

This is important, for example, in the chemical industry or in the automotive sector.

Electrical Properties

• Insulation capacity
• Dielectric Strength

Particularly relevant for electronics and electrical engineering applications.

Weight and Density 

High-performance plastics are often lighter than metals, which is particularly important in the aircraft and automotive industries.

Can high-performance plastics be recycled?

Generally speaking, yes! However, the process is often more complex than with conventional plastics. Their specific properties and applications require careful handling during recycling.

Methods that can also be used for recycling high-performance plastics generally include: 

• Mechanical recycling: In this method, plastics are shredded and reprocessed into new products. However, this process can compromise the properties of the materials.
• Chemical Recycling: In this process, plastics are broken down into their chemical components and can then be used to manufacture new high-performance plastics. This method can help preserve the original properties of the plastics.
• Energy recovery: If the material cannot be recycled directly, it can be incinerated to generate energy.

The recyclability of high-performance plastics depends heavily on their composition, the recycling process used, and the infrastructure for collection and processing. However, technological advances and innovative recycling methods are increasingly improving their recyclability.

Conclusion

High-performance plastics are a special class of plastics characterized by their exceptional physical, chemical, and thermal properties. They are used in demanding applications where standard plastics often do not perform well enough.

Overall, high-performance plastics play an important role in technological development and offer innovative solutions across numerous industries, while at the same time, their recyclability and environmental sustainability are becoming an increasingly important focus.