Question:
Which of the following types of penetrant is most commonly used for detecting very fine surface cracks in non-porous materials?
Which of the following types of penetrant is most commonly used for detecting very fine surface cracks in non-porous materials?
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Fluorescent penetrants are best for detecting fine surface cracks due to their high visibility under UV light.
Updated On: Jun 20, 2025
- Fluorescent penetrant
- Visible penetrant
- Water-soluble penetrant
- Oil-based penetrant
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The Correct Option is A
Solution and Explanation
Fluorescent penetrants are highly sensitive to detecting very fine surface discontinuities, especially in non-porous materials.
These penetrants emit a bright glow under ultraviolet (UV) light, making even the smallest cracks or flaws visible to inspectors.
Compared to visible penetrants, fluorescent types offer better contrast and resolution.
They are particularly effective in aerospace and critical component inspections where micro-crack detection is vital.
These penetrants emit a bright glow under ultraviolet (UV) light, making even the smallest cracks or flaws visible to inspectors.
Compared to visible penetrants, fluorescent types offer better contrast and resolution.
They are particularly effective in aerospace and critical component inspections where micro-crack detection is vital.
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