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Determination of the roughness parameters of a metallic surface


Determination of the roughness parameters of a metallic surface
Presentation for participants
Reference of the ILC: RU18M
References of test methods: ISO 4287, ISO 4288
Frequency: Each year
Main characteristics Ra, Rz, Rt, Rp, RSM
Other characteristics Other parameters R and W described in ISO 4287.
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: 6
Product submitted to tests: Galvanised steel
Type of samples: Plates
Approximate dimensions of samples: ± 100x50x1 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)