Which term describes the time allowed for penetrant to enter discontinuities?

Which term describes the time allowed for penetrant to enter discontinuities?

• A. Penetration time
• B. Development time
• C. Dwell time
• D. Rinse time

Answer: (A)

The main idea here is how long the penetrant is allowed to enter and fill flaws. This time is described as the penetration time—the period after apply that lets capillary action draw penetrant into discontinuities. Getting this duration right ensures defects are adequately filled so they can be seen later, while not overdoing it and creating excess background. After this step, you move on to removing excess penetrant, applying developer, and rinsing, each with its own timing.

The main idea here is how long the penetrant is allowed to enter and fill flaws. This time is described as the penetration time—the period after apply that lets capillary action draw penetrant into discontinuities. Getting this duration right ensures defects are adequately filled so they can be seen later, while not overdoing it and creating excess background. After this step, you move on to removing excess penetrant, applying developer, and rinsing, each with its own timing.