Definition
Resistance to tear propagation once a notch or nick initiates a tear; varies by resin orientation and structure.
Applications
- Industrial bags
- Heavy handling
- Tear-open features (controlled)
Benefits
- Reduces catastrophic tearing
- Improves handling durability
- Can be tuned for easy-open where desired
Industry Examples
- Medical: pouches that resist tearing during aseptic presentation.
- Industrial: bags for sharp parts that must resist tear propagation from small cuts.
- Electronics: prevents accidental tearing of moisture barrier bags during handling and assembly.
FAQ
Q: How is tear resistance measured?
A: Standardized tear tests (e.g., Elmendorf) depending on material.
Q: Can you engineer easy tear and high resistance?
A: Yes—use tear initiation features with controlled tear direction.