Determination of the roughness parameters of a metallic surface

Presentation for participants

Reference of the ILC

RU22M

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

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 and by several different methods)

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 polish the test specimens or to adapt their dimensions to the equipment of the participant)

                   

Special notice for this ILC

Results obtained by several methods may be provided

   

Time schedule:

 

Opening date of registrations

15/11/2021

Registration deadline

15/03/2022

Date of shipment of samples

05/06/2022

Start of the tests

10/06/2022

Deadline for carrying out the tests and providing the results

31/08/2022

Date of delivery of reports

15/10/2022

Note: After the deadline, registrations are only accepted within the limit of availability of samples

                       

Price (€)

300

Price if online payment (€)

240

Approximate weight (kg)

1