ASNT Level III- Visual & Optical Testing
My Level III Self Study Notes Reading 4 Section 4B
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