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.
Frequently Asked Questions
Questions and Answers
