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Why PMI called positive material identification

Why PMI called positive material identification

Postby mohd » Mon Oct 14, 2013 9:25 am

dear sir,
why PMI is called positive material identification?
what is "positive" stand for materials?

regards
mohd.
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Re: Why PMI called positive material identification

Postby alvaro » Mon Oct 14, 2013 11:17 am

The term "positive" stands nothing for the material itself. Instead this term used because of the nature of the method. Given the metal's MTC (material test certificate), you do PMI in order to "positively" verify that metal. PMI doesn't make sense in case that we don't know what the material is since it doesn't give a chemical analysis of the metal but it gives the approximate amounts of chemical elements included in this metal that is enough for the verification of the metal.
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