What damage level occurs at 10-20% elongation of rubber?

At an elongation of 10-20%, rubber generally experiences repairable damage rather than maximum damage. This level of elongation indicates that the material is being stretched beyond its normal parameters but may still retain some structural integrity. This can lead to stress at a critical level where some deterioration might occur, but it does not signify a complete failure.

Maximum damage typically refers to scenarios where the rubber has been excessively stretched or has experienced any tearing or irreversible deformation. In contrast, repairable damage signifies that while the material's characteristics may be compromised, it is still within a range where remedies such as reconditioning, patching, or other forms of repair can be effective. Thus, the correct understanding is that at 10-20% elongation, rubber enters a state of damage that is usually considered repairable rather than maximum.