What are the differences in impact absorption between PVC and polypropylene?

When comparing PVC (Polyvinyl Chloride) and polypropylene in terms of impact absorption, several key differences emerge due to their distinct material properties.

1. Material Composition:

- PVC is a rigid thermoplastic with high density, offering moderate impact resistance.

- Polypropylene is a semi-crystalline polymer with lower density but higher flexibility, enhancing its ability to absorb shocks.

2. Impact Resistance:

- PVC tends to be brittle at low temperatures, making it prone to cracking under sudden force.

- Polypropylene excels in impact absorption, especially in dynamic loading conditions, due to its elastic nature.

3. Applications:

- PVC is commonly used in construction (pipes, flooring) where rigidity is prioritized over shock absorption.

- Polypropylene is favored in automotive parts, packaging, and consumer goods where durability and impact resistance are critical.

4. Environmental Factors:

- PVC’s performance degrades under UV exposure, reducing its impact resistance over time.

- Polypropylene maintains better consistency in varied temperatures and environmental conditions.

In summary, polypropylene outperforms PVC in impact absorption due to its flexibility and resilience, while PVC is better suited for static, rigid applications. Choosing between them depends on the specific requirements of shock resistance and environmental exposure.