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ASNT Level III- Visual & Optical Testing

My Level III Self Study Notes Reading 4 Section 4B

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PART 7: CHEMICAL AIDS<br />

7.0 General<br />

The information contained in this text is simplified and<br />

provided only for general instruction. Local health (OSHA)<br />

and environmental (EPA) authorities should be consulted<br />

about the proper use and disposal of chemical agents. For<br />

reasons of safety, all chemicals must he handled with care,<br />

particularly the concentrated chemicals used as aids to visual<br />

and optical tests.<br />

In visual nondestructive testing, chemical techniques are<br />

used to clean and enhance test object surfaces. Cleaning<br />

processes remove dirt, grease, oil, rust and mill scale. Contrast<br />

is enhanced by chemical etching.<br />

Charlie Chong/ Fion Zhang

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