Which should be ensured when choosing dyes for liquid penetrant testing, especially in terms of temperature effects?

When selecting dyes for liquid penetrant testing, it is essential to ensure that they do not degrade at high temperatures. High temperatures can negatively impact the performance of the dye and the penetrant system, leading to inaccurate results or complete failure of the testing process. If a dye degrades under elevated temperatures, it may lose its ability to effectively penetrate, reveal defects, or provide adequate contrast against the background material.

Maintaining the integrity of the dye at operational temperatures is crucial for achieving reliable and consistent results in penetrant testing. This ensures that any defects present in the material are accurately detected and characterized. Therefore, selecting a dye that remains stable at the temperatures encountered during testing is vital for the effectiveness of the liquid penetrant testing procedure.