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Chemical analysis on copper alloy (brass)


Reference of the ILC: CA16B
References of test methods: -
Frequency: Each 3 years
Main characteristics Si%, Mn%, S%, P%, Ni%, Cr%, V%, Al%, Co%, Pb%, Sb%, As%
Other characteristics All other chemical elements existing in copper alloy
Caution: The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories
Determination of the assigned values (“true values” for each characteristic):
By statistical computation of the totality of the results with possible selection on competence criteria (accreditation, validation by a reference body, quantity of tests performed in the year), test to detect possible collusion, merging of results not obtained in reproductibility conditions, suppression of technically unvalid results.
Type of statistical computation:
Results are numerical. For each characteristic selected by the participant, 2 results shall be provided for each sample. The statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability, for reproductibility and for inter-sample homogeneity, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
Number of samples per participant: 3
Product submitted to tests: Brass (Copper alloy)
Type of samples: Discs
Approximate dimensions of samples: ± Ø40x10 mm
Specific preparation to be performed by the participant:  None (other than possible necessity to adapt dimensions of the test specimen to the equipment of the participant)
Special notice for this ILC: This ILC, which number of potential participants is low, is a continuation of the 2016 edition, using the same samples. The 2017 results will be merged with the 2016 ones to get a greater number of results, increase the accuracy of the assigned values and make the assessment more efficient. Consequently, the number of participants is limited by the availability of samples. Moreover, a participation is of low interest for those who participated in 2016.

All methods may be used. All chemical elements may be determined by the participating laboratory. However, a statistical computation is performed only if a sufficient quantity of results is received.
Note: Chemical analysis on metal products is covered by a large number of international standards, see