ISPE Glossary of Pharmaceutical and Biotechnology Terminology

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Maximum Cr/Fe Ratio

The maximum ratio of chromium to iron and the depth at which it occurs are the most direct measures of the chromium enrichment in a material oxide layer. Typical ratios are about 1:5 or greater for well-electropolished 316L stainless steel. The depth at which the maximum Cr/Fe ratio is found varies but is usually about one-half the oxide thickness.

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