PEI vs PET — High-Performance Transparent vs Economical General
Comparison Overview
PEI vs PET — High-Performance Transparent vs Economical General. Choose PEI when 170°C temperature rating, transpar…
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
PET — Polyethylene Terephthalate
Properties
| Property | Value |
|---|---|
| Service Temp. | 120°C |
| Density | 1.38 g/cm³ |
| Tensile Strength | 75 MPa |
| Flexural Modulus | 2,800 MPa |
| Hardness | Rockwell M90 |
| Flammability | HB |
Advantages
- Excellent cost-performance ratio
- Good mechanical properties
- Excellent electrical insulation
- Good chemical resistance
- Excellent processability
Applications
Food PackagingMechanical PartsElectrical InsulationAutomotive InteriorTextile Machinery
Price Level
Low
Selection Guidance
✓ Choose PEI
Choose PEI when 170°C temperature rating, transparency, V-0 flame retardance, or better electrical properties are required.
✓ Choose PET
Choose PET when cost is the primary concern, service temperature is below 120°C, and only HB flammability rating is acceptable.
Price Reference
PEI: Med-High
PET: Low
PEI is typically 3-5x the price of PET.
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