Polypropylene Injection Molding
Polypropylene (PP) is a lightweight, cost-efficient resin used for parts that need flexibility and chemical resistance. It’s popular for consumer, industrial, and laboratory components.
Key Properties
- Excellent fatigue life (great for living hinges)
- Chemical and moisture resistance
- Low density for weight reduction
- Heat resistance up to ~100°C
Common Applications
Used in packaging, medical containers, lab components, and consumer closures. Ideal for one-piece parts with integrated hinges.
Design Considerations
Keep hinge thickness around 0.25–0.35 mm and ensure consistent wall sections. Provide texture or matte finishes to reduce surface scuffing.
Additives and Variants
- UV-stabilized for outdoor use
- Impact-modified for cold performance
- Food-contact or FDA-compliant grades
When to Choose Polypropylene
Choose PP when flexibility, low cost, or chemical resistance are top priorities.
Learn more on our Injection Molding Materials hub.
