PEEK vs PEI — All-Round King vs Rigidity Pioneer
Comparison Overview
PEEK vs PEI — All-Round King vs Rigidity Pioneer. Choose PEEK when 260°C temperature rating, excepti…
PEEK — Polyetheretherketone
Properties
| Property | Value |
|---|---|
| Service Temp. | 260°C |
| Density | 1.32 g/cm³ |
| Tensile Strength | 100 MPa |
| Flexural Modulus | 4,000 MPa |
| Hardness | Rockwell M99 |
| Flammability | V-0 |
Advantages
- Best all-round balanced performance
- Excellent chemical resistance — nearly no solvent attack
- Excellent biocompatibility (ISO 10993)
- Good processability
- Outstanding wear and fatigue resistance
Applications
AerospaceMedical ImplantsSemiconductorAutomotiveFood Processing
Price Level
High
PEI — Polyetherimide
Properties
| Property | Value |
|---|---|
| Service Temp. | 170°C |
| Density | 1.27 g/cm³ |
| Tensile Strength | 105 MPa |
| Flexural Modulus | 3,300 MPa |
| Hardness | Rockwell M109 |
| Flammability | V-0 |
Advantages
- High rigidity and strength
- Excellent transparency — ideal for sight glass
- Inherent V-0 flammability rating
- Excellent electrical insulation
- Excellent dimensional stability
Applications
AerospaceMedical DevicesElectronicsAutomotive LightingMicrowave Comms
Price Level
Med-High
Selection Guidance
✓ Choose PEEK
Choose PEEK when 260°C temperature rating, exceptional chemical resistance, or biocompatibility is required.
✓ Choose PEI
Choose PEI when high rigidity, transparency, or cost control matters; within 170°C, PEI is a cost-effective alternative to PEEK.
Price Reference
PEEK: High
PEI: Med-High
PEEK is typically 2-3x the price of PEI.
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