Determination of the roughness parameters of a metallic surface

Presentation for participants

 
Reference of the ILC: RU20M
   
References of test methods: ISO 4287  ISO 4288                  
   
Frequency: Each year
   
Time schedule:  
Opening date of registrations Registration deadline Date of shipment of samples Start of the tests Deadline for carrying out the tests and providing the results Date of delivery of reports
15/11/2019 15/03/2020 20/05/2020 01/06/2020 15/07/2020 15/10/2020
Note: After the deadline, registrations are only accepted within the limit of availability of samples
   
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: 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.
Number of products submitted to tests: 1
Number of samples per participation: 3
Max number of operators per participation: 10 (For this CIL, the type of test and sample size allow to provide results determined by several different operators)
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)
                   
Special notice for this ILC: Results obtained by several methods may be provided