What terms describe different types of developers in liquid penetrant testing?

In liquid penetrant testing, developers play a crucial role in enhancing the visibility of the penetrant indications by ensuring that any penetrant present on the surface can be drawn out of defects and shown clearly for inspection. The terms associated with different types of developers help categorize them based on their composition and application method.

The first group, dry developers, refers to finely powdered materials that are applied to the surface to absorb and draw out penetrant from the defects. Aqueous wet developers are water-based solutions that are applied in a wet state, working to facilitate the development of the penetrant indications in a controlled manner. Non-aqueous wet developers, on the other hand, are solvents or oil-based formulations that achieve similar results without the use of water.

This classification demonstrates the different characteristics and uses of developers in liquid penetrant testing, which is significant for ensuring that the appropriate method is used for specific inspection scenarios. Hence, identifying developers as dry, aqueous wet, and non-aqueous wet correctly reflects their operational functionalities within the testing process.