ASNT NDT Level III PT Practice Questions - ASNT NDT Level III Liquid Penetrant Testing (PT) Exam

Why does penetrant viscosity matter to a Level III approving a procedure for tight fatigue cracks?

Higher viscosity always improves sensitivity by holding more dye in the crack Very high viscosity slows entry into tight openings even when wetting is good, so dwell time may need to increase Viscosity has no influence on penetrant performance Lower viscosity always produces visible indications more quickly

Correct Answer:

Very high viscosity slows entry into tight openings even when wetting is good, so dwell time may need to increase

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