Determination of resistance of a paint coating to water immersion

Presentation for participants

 
Reference of the ILC: WI-X-PC
   
References of test methods: ISO 2812-2                    
   
Frequency: For this ILC, there is a risk that the number of registrations is insufficient. So a pre-registration procedure is put in place, as follows:
  1 - Participants interested in participating pre-register using the registration form. No invoicing is made for this pre-registration;
2 - When at least 10 potential participants have pre-registered, CompaLab asks each of these pre-registrees to confirm their willingness to participate and what are the characteristics for which they commit to provide results;
3 - If at least 8 participants confirm their intention to participate, the CIL organisation concerned is engaged.
   
   
Main characteristics: Total immersion method - Rating of defects due to ageing in accordance with ISO 4628-2 and ISO 4628-8 - Cross-test against ISO 2409 - Selected exposure time for assessment: 28 cycles of 24h
   
Other characteristics: t (thickness of coating) in accordance with ISO 2808, Rating of defects due to ageing in accordance with ISO 4628-3 to 5, Gloss coefficients G20, G60, G85 in accordance with ISO 2813, Colorimetric parameters L*-a*-b* in accordance with ISO 7724-1 to 3
  Caution: The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories
   
Format of the test results: Results of some properties are numerical and some are expressed as a choice between several possibilities (categories).
   
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.
  For results expressed as a choice between several possibilities (categories), Gower indexes are computed from the results, which enables the calculation of assigned values, repeatability and reproducibility standard deviations, 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: 6
Max number of operators per participation: 1 (it is necessary to order as many participations as there are participating test operators)
Product submitted to tests: Paint coating (on steel)
Type of samples: Plates
Approximate dimensions of samples: 150x100x1 mm
Specific preparation to be performed by the participant:  Protection of edges
                   
Special notice for this ILC: The samples are provided with a scribe against ISO 17872