The material for this CURM was prepared by Replicast Ltd (formerly BCIRA), Sheffield, UK, using a special method of casting known to provide material of uniform composition in a form suitable for use as a Reference Material (RM) for Optical Emission Spectrometric analysis. Discs from this cast have been shown, by statistically designed procedures, to provide reproducible results using Optical Emission Spectrometry. CURM 51.13-4 is sold as a chill cast disc, approximately 50mm diameter x 10mm thick with a single chilled working face. Spectroscopic reproducibility has been shown to be reliable to a depth of 5mm below the original working surface of the disc. Analysis must be made on the chilled working surface (smaller diameter) and the sample should be discarded when the thickness is reduced to 5mm. This CURM is available in bottles of 100g of turnings.

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