Determination of the roughness parameters of a metallic surface
Presentation for participants
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RU25M |
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References of test methods |
ISO 4287 ISO 4288 ISO 21920-2 ISO 21920-3 |
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Frequency |
Each year |
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Main characteristics |
Ra, Rz, Rt, Rp, RSM |
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Other characteristics |
Other parameters R and W described in ISO 4287 or ISO 21920-2 |
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Caution The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories |
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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. |
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Type of statistical computation |
For numerical results, the statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability and reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants. |
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Number of products submitted to tests |
1 |
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Number of samples per participation |
3 |
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Max number of operators per participation |
10 (For this ILC, the type of test and sample size allow to provide results determined by several different operators and by several different methods) |
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Product submitted to tests |
Galvanised steel |
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Type of samples |
Plates |
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Approximate dimensions of samples |
100x50x1 mm |
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Specific preparation to be performed by the participant |
None (other than possible necessity to polish the test specimens or to adapt their dimensions to the equipment of the participant) |
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Special notice for this ILC |
Results obtained by several methods may be provided |
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Time schedule: |
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Opening date of registrations |
20/12/2024 |
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Registration deadline |
15/03/2025 |
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Date of shipment of samples |
30/05/2025 |
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Start of the tests |
03/06/2025 |
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Deadline for carrying out the tests and providing the results |
25/08/2025 |
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Date of delivery of reports |
07/10/2025 |
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Note: After the deadline, registrations are still possible. Contact us at ilc@compalab.org for more information. |
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Price (€) |
325 |
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Price if online payment (€) |
260 |
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Approximate weight (kg) |
1 |
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