PEEK
Injection Molding | High strength, thermal resistance, chemical resistance.
Introduction
PEEK is a high-temperature resin used in safety-critical industries such as medical, aerospace and automotive. The high-performance material offers good chemical and heat resistance, as well as flame retardancy, and provides excellent strength and dimensional stability.
Applications: Cable insulation, piston parts, bearings, valves, pumps, medical implants, ultra-high vacuum applications.
Behavior: If PEEK proves too expensive, Ultem or PPSU is more budget-friendly alternatives.
| Properties | Metric | |
|---|---|---|
| Density | 1.01 – 1.20 g/cc | 0.0365 – 0.0434 lb/in³ |
| Hardness | 68 – 113 | 68 – 113 |
| Tensile Strength (Yield) | 13.0 – 65.0 MPa | 1890 – 9430 psi |
| Tensile Strength (Ultimate) | 22.1 – 49.0 MPa | 3210 – 7110 psi |
| Elongation at Yield | 0.62 – 30 % | 0.62 – 30 % |
| Elongation at Break | 3.0 – 150 % | 3.0 – 150 % |
| Dielectric Strength | 18.0 – 50.0 kV/mm | 457 – 1270 kV/in |
| Melt Temperature | 180 – 274 °C | 356 – 525 °F |
Surface Finish
Design Guideline
Wall Thickness
Between 1 mm and 3 mm
Keeping walls as thin and constant as possible will reduce warping and sinking
Thickness gradient
Wall thickness should increase by no more than three times
Transition between thicknesses can be made smoother with fillets
Internal edges
Rounded, more than half wall thickness
Add fillet with largest possible radius
External edges
Rounded, full wall thickness plus internal fillet
Add fillet with largest possible radius
Draft angle
Increase draft by 1° for every 25 mm (for parts taller than 50 mm)
Add draft to ease ejection and avoid drag marks
Textured finish
Increase draft angle by 1-2°
Increase draft to ease ejection and avoid drag marks
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