Determination of resistance of a paint coating to UV exposure

Presentation for participants

Reference of the ILC:

UV-X-G

   

References of test methods:

ISO 4892-3  ISO 16474-3  ISO 11507  ISO 2808  ASTM B659
ASTM D1186  ISO 2813  ASTM D523  ISO 7724 Parts 1, 2 & 3
ISO 11664 Parts 1 & 4  ASTM E308  ISO 2409  ASTM D3359 Met. B
ISO 4628 Parts 1 to 8  ASTM D610  ASTM D714  ASTM D1654

   

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:

ISO 16474-3 Cycle1 (method A) - Selected exposure time for assessment: 84 cycles of 8h (4h irradiation & 4h condensation, 28 days in total) - Rating of defects due to ageing in accordance with ISO 4628-6, -7 -

 

Cross-test against ISO 2409

Other characteristics:

t (thickness of coating) in accordance with ISO 2808, 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:

2

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:

For this ILC, 2 different products (paint coating and plastic) are provided for testing.

Type of samples:

Plates

Approximate dimensions of samples:

150x100x1 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:

ISO 14674-3 has replaced ISO 11507. Test conditions correspond to Type II lamp and Method A exposure of ISO 11507.

   

Price (€)

400

Price if online payment (€)

320

Approximate weight (kg)

2