What is considered a passing result for a patch test?

In the context of a patch test, a passing result is identified when less than 10% of the patch exhibits defects. This threshold is critical in determining whether the patch has maintained its integrity and function. A small percentage of defects indicates that the overall quality and stability of the patch are acceptable, suggesting that it can still be considered effective for its intended purpose or exposure.

When assessing the integrity of a patch, the focus is on ensuring that it meets certain performance criteria. In this case, a result showing defects beyond 10% would raise concerns about the patch's reliability, while an absence of defects or intact layers might indicate a more ideal situation but does not reflect the established criteria for passing the test itself. Therefore, the standard is established to ensure that there is a balanced understanding of acceptable risk versus performance.