Intended Use

Intended for calibration, validation and matrix-match verification of cast iron spectrometric analysis from a plane of solid sample: Atomic Emission Spectrometry with spark, glow-discharge or laser excitation, and X-ray Fluorescence Spectrometry.

Technical Parameters (CKD241 / CKD249)

The samples were white chill-cast on a massive copper block with controlled speed at a controlled temperature of the molten metal. The samples are truncated pyramids with a base analytical surface (38x38 mm), a minimum total height of 20 mm and a side ledge 11-13 mm high. The samples can be used until 1 mm of the ledge height remains. The certified portion of a sample extends 10-12 mm from the original analytical surface. Shrinkage cavities and porosity, which may appear in the uncertified portions of the samples, do not affect the analytical performance of the certified portions. The uncertified portions should not be used for calibration and/or validation. Homogeneity was tested by Atomic Emission Spectrometry with an analytical area approximately 4 mm in diameter. The CRMs were tested for random homogeneity and trend homogeneity along the height of the certified portion. Trend homogeneity of the casting sequence was also tested. The latter test was supported by Combustion-IR Molecular Absorption Spectrometry and Thermo-evolution.

Technical Parameters (CZ02033-1 / CZ02033-8)

Homogeneity of the certified constituents and of the influence by structure were tested by the spark excitation AES, the technique prevailing in the cast iron analysis and coincidentally the most strongly structure-influenced technique. The within-sample trend homogeneity was tested as the difference of results on the opposite limits of the certified layer, the between-samples trend as the difference of results from the beginning and the end of casting. Both were found statistically insignificant except for a few cases, contributions of which were combined to the ultimate uncertainty of the certified values. Repeatability of the subsequent analyses distributed evenly on the same working surface was taken for a conservative estimate of the within-sample random homogeneity, as the repeatability of instrument itself cannot be exactly separated. This overall repeatability was satisfactory in respect to the uncertainty of all certified values. The CRM are stable by the nature of their matrix. Manufactured as gangs of chill-cast discs, cooled on either side in vertical position. This resulted in a white (i.e. effectively graphite free) structure required by spectrometry. 0.5 mm was machined off either cooling surface. Supplied in a set or as individual discs 40 mm in diameter and approximately 18 mm of total height, with two certified layers extending 6 mm upwards from either working surface. The discs are marked on side by the CRM code and the certified layers' limits. When used to both limits, the remainder, which may contain minor structure defects, should be discarded.

Manufacture and Characterization

Manufactured and characterized in compliance with the Czech Metrology Institute Methodical procedure No. 0217-MP-C001-06: Preparation and certification of reference materials, and ISO REMCO Guides 34, 35.

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