IEC 62321-7-1:2015 to determine of hexavalent chromium (Cr(VI)) in electrotechnical products

On 16 September 2015, International Electrotechnical Commission issued IEC 62321-7-1:2015 to describes a boiling water extraction procedure intended to provide a qualitative determination of the presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protection coatings on metallic samples.

When Cr(VI) in a sample is detected below the 0,10 μg/cm2 LOQ (limit of quantification), the sample is considered to be negative for Cr(VI). Since Cr(VI) may not be uniformly distributed in the coating even within the same sample batch, a “grey zone” between 0,10 μg/cm2 and 0,13 μg/cm2 has been established as “inconclusive” to reduce inconsistent results due to unavoidable coating variations. In this case, additional testing may be necessary to confirm the presence of Cr(VI). When Cr(VI) is detected above 0,13 μg/cm2, the sample is considered to be positive for the presence of Cr(VI) in the coating layer.

IEC 62321-7-1:2015 Presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protected coatings on metals by the colorimetric method (g/cm²)
Test result	<0.10	0.10~0.13	>0.13
Conclusion	Negative (No)	Inconclusive	Positive (Yes)

IEC 62321-7-1:2015 supersedes partial content of the previous IEC 62321:2008 and adjusts its structure to form Annex B. While IEC 62321 (determination of certain substances in electrotechnical products) documents will gradually take the correspondent clauses of IEC 62321:2008. Currently, IEC 62321-1, -2, -3-1, -3-2, -4, -5, -6, -7-1 are issued (eight parts in total). Unpublished contents in IEC 62321:2008 as a part shall be valid before all parts are issued separately.

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