Which of the following is not a liquid penetrant system?

A high-temperature liquid penetrant system is, indeed, a recognized method in non-destructive testing. It is tailored for applications that need to be evaluated at elevated temperatures, addressing the specific challenges that such conditions present.

On the other hand, the terms low sensitivity, water washable, and solvent removable all refer to different classifications of liquid penetrant systems.

A low sensitivity penetrant is designed to detect larger discontinuities due to its reduced sensitivity, making it suitable for particular types of inspections.

Water washable penetrants are formulated to be easily removed with water after inspection, ensuring efficient cleanup while maintaining the sensitivity of the penetrant.

Solvent removable penetrants require a solvent wash for removal, which can be advantageous in certain inspection environments where water cannot be used.

Understanding these distinctions is crucial in selecting the appropriate liquid penetrant system for a specific application based on the type and size of discontinuities likely to be present.