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Determination of resistance of a paint coating to UV exposure


Determination of resistance of a paint coating to UV exposure
Presentation for participants
Reference of the ILC: UV18PC
References of test methods: ISO 16474-3
Frequency: Each 3 years
Main characteristics Cycle1 (method A) - Selected exposure times for assessment: 0, 3, 9 and 28 cycles of 24h - Rating of defects due to ageing in accordance with ISO 4628-6 and -7 - Cross-test against ISO 2409 after 28 cycles of 24h
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
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:
Results are numerical. For each characteristic selected by the participant, 1 result shall be provided for each sample. The statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability, for reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
Number of samples per participant: 2x6
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:  None (other than possible necessity to adapt dimensions of the test specimen to the equipment of the participant)