Best High-Performance & Engineering Plastics Products Compared
High-performance engineering plastics like PEEK, PPS, PEI, and PTFE are critical for aerospace, chemical processing, and extreme environment applications. This comparison analyzes the top polymers to help engineers select the optimal material for demanding applications.
PEEK (Polyetheretherketone)
9.5/10Ultimate high-temperature crystalline thermoplastic
$45-90/lb depending on grade
Pros
- +Outstanding chemical resistance to acids, bases, and solvents
- +Continuous use temperature up to 250°C (482°F)
- +Excellent mechanical properties at elevated temperatures
- +Radiation resistant for nuclear applications
- +Multiple grades available for specific requirements
Cons
- -Extremely high material cost
- -Requires specialized processing equipment
PTFE (Polytetrafluoroethylene)
8.5/10Universal chemical-resistant fluoropolymer
$8-20/lb depending on grade
Pros
- +Unmatched chemical inertness to virtually all chemicals
- +Low friction and non-stick properties
- +Wide temperature range: -200°C to 260°C
- +Excellent electrical insulation properties
Cons
- -Poor mechanical properties and wear resistance
- -Difficult to process - requires specialized techniques
- -Cold flow and creep under load
PPS (Polyphenylene Sulfide)
8/10Chemical-resistant crystalline engineering plastic
$12-25/lb depending on grade
Pros
- +Excellent chemical resistance, especially to acids
- +Good high-temperature performance up to 200°C
- +Lower cost than PEEK while maintaining performance
- +Good dimensional stability and low moisture absorption
Cons
- -Brittle at room temperature without reinforcement
- -Limited impact resistance compared to PEEK
- -Processing requires careful temperature control
PEI (Polyetherimide) Ultem
7.5/10Amorphous high-performance thermoplastic
$15-30/lb depending on grade
Pros
- +Excellent flame resistance without additives
- +Good impact strength and toughness
- +Transparent grades available
- +Easier processing than crystalline polymers
Cons
- -Lower chemical resistance than PEEK/PPS
- -Susceptible to stress cracking in some environments
Feature Comparison
| Feature | PEEK (Polyetheretherketone) | PTFE (Polytetrafluoroethylene) | PPS (Polyphenylene Sulfide) | PEI (Polyetherimide) Ultem |
|---|---|---|---|---|
Maximum Service Temperature Continuous operating temperature capability | - | - | - | - |
Chemical Resistance Resistance to acids, bases, and solvents | - | - | - | - |
Mechanical Strength Tensile strength and structural capability | - | - | - | - |
Processing Difficulty Ease of molding and fabrication | - | - | - | - |
Cost Effectiveness Material cost versus performance ratio | - | - | - | - |
Aerospace Qualification Availability of aerospace-certified grades | - | - | - | - |
Verdict
PEEK leads in overall performance for the most demanding applications, while PPS offers the best balance of chemical resistance and cost. PEI excels in flame-critical applications, and PTFE remains unmatched for chemical inertness. Material selection depends on specific application requirements and budget constraints.
Aerospace structural components
PEEK
Superior mechanical properties at temperature with aerospace qualifications
Chemical processing equipment
PPS
Excellent chemical resistance at lower cost than PEEK
Electronics and flame-critical applications
PEI Ultem
Inherent flame resistance and good electrical properties
Seals and gaskets in harsh chemicals
PTFE
Universal chemical resistance and sealing properties
FAQ
What's the difference between PEEK 450G and PEEK 150G grades?
PEEK 450G is unfilled and offers maximum chemical resistance, while PEEK 150G contains carbon fiber reinforcement for higher strength and stiffness but slightly reduced chemical resistance. Choose based on whether you prioritize chemical compatibility or mechanical performance.
Can PPS replace PEEK in chemical processing applications?
PPS can often replace PEEK in chemical processing where temperatures stay below 200°C and extreme mechanical performance isn't required. PPS offers similar chemical resistance at roughly 30-50% lower material cost, making it attractive for cost-sensitive applications.
Why is PTFE difficult to machine compared to other high-performance plastics?
PTFE's low friction and tendency to cold flow make it challenging to machine with conventional techniques. It requires very sharp tools, light cuts, and sometimes cryogenic cooling to achieve good surface finishes and dimensional accuracy.
How do I select between amorphous (PEI) and crystalline (PEEK/PPS) polymers?
Crystalline polymers like PEEK and PPS offer better chemical resistance and higher temperature capability but are more difficult to process. Amorphous polymers like PEI are easier to process, more transparent, but have lower chemical resistance. Consider your processing capabilities and end-use requirements.