Introduction
Polypropylene (PP) is an inexpensive thermoplastic with variable impact resistance depending on the grade. PP is wear-resistant, flexible and can have high elongation, while it also has high chemical resistance.
Applications: Fans, lids, packaging, integral hinges, living hinges, medical tubes.
Behavior: Thick sections of molded PP are vulnerable to sink and bubbles, with shrink and warp also possible. K-Resin is a suitable replacement for living hinges.
| 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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