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Criteria for assessing insect resistance.
| Estimation of Surface Degradation | Hole Estimation | ||
|---|---|---|---|
| Symbol | Ruptures-Visibly Degraded Surface | Symbol | |
| 1 | No visible damage | A | No visible holes |
| 2 | Reduced degradation | B | Partially destroyed yarns and fibres |
| 3 | Moderate damage | C | Reduced number of holes; destroyed yarns and fibres |
| 4 | Major damage | D | Large holes |
