When selecting materials for demanding applications, PEEK (Polyetheretherketone) and PSU (Polysulfone) are two widely used high-performance thermoplastics known for their excellent mechanical, thermal, and chemical properties. While both materials offer durability, they serve different industries and applications. This article provides a detailed comparison of PEEK and PSU to help you make an informed choice.
What is PEEK?
PEEK (Polyetheretherketone) is a high-performance thermoplastic polymer recognized for its outstanding mechanical strength, heat resistance, and chemical stability. It is commonly used in aerospace, automotive, medical, and industrial applications.
Key Features of PEEK
High mechanical strength and impact resistance
Withstands temperatures up to 260°C (500°F)
Excellent chemical resistance to acids, bases, and solvents
Superior wear and friction properties, ideal for high-load applications
Biocompatible, making it suitable for medical implants and surgical components
Common Applications of PEEK
Automotive components such as bearings, seals, and gears
Aerospace structural parts requiring lightweight and durability
Medical implants, including spinal cages and dental prosthetics
Electronics and semiconductor insulating components
What is PSU?
PSU (Polysulfone) is another high-performance thermoplastic known for its transparency, high-temperature resistance, and chemical stability. It is often chosen for applications requiring toughness, clarity, and dimensional stability under heat and pressure.
Key Features of PSU
Withstands temperatures up to 180°C (356°F)
Good chemical resistance against acids and detergents
Transparent, maintaining optical clarity under heat
Biocompatible and widely used in medical applications
Resistant to hydrolysis, suitable for repeated steam sterilization
Common Applications of PSU
Medical-grade plastic components such as surgical trays and IV connectors
Food processing equipment compliant with FDA standards
Automotive fuel system components
Aerospace and electronics applications
Key Differences Between PEEK and PSU
| Property | PEEK (Polyetheretherketone) | PSU (Polysulfone) |
|---|---|---|
| Temperature Resistance | Up to 260°C (500°F) | Up to 180°C (356°F) |
| Mechanical Strength | High | Moderate |
| Chemical Resistance | Excellent | Good |
| Transparency | Opaque | Transparent |
| Wear Resistance | Excellent | Moderate |
| Biocompatibility | Yes, used in implants | Yes, used in medical devices |
| Cost | Higher | More affordable |
| Electrical Insulation | Excellent | Excellent |
Which One Should You Choose?
Choose PEEK if you need extreme heat resistance, superior mechanical strength, and chemical durability for high-performance applications. It is the best choice for aerospace, automotive, and medical implants.
Choose PSU if you need a cost-effective, high-temperature-resistant, and transparent plastic for medical devices, food processing, and automotive components.
Both PEEK and PSU are high-performance thermoplastics with excellent properties. PEEK excels in extreme environments, while PSU offers high heat resistance and transparency at a lower cost. The right choice depends on the specific requirements of your application.
