SICIS Vetrite Certificates ISO UNI EN Standards

Materiali Energia Innovazione Rev. -- Execution Drafting Approval Page 5 of 9 _Eng. Mattia Santandrea, PhD_ _Eng. Mattia Santandrea, PhD_ _Eng. Luca Laghi_ |SQM_348_2020| Soci Fondatori 4.2 Evaluation of the chromatic variation between reference specimens and conditioned specimens For each of the two types of product, the chromatic variation was evaluated according to Ref. 2-e, between the conditioned specimen and the reference specimen. After being positioned side by side, in contact on the same plane and under artificial lighting, the specimens were observed at a distance of about 500 mm from the eyes. The panels were also observed by tilting the specimen at a 45° angle to the direction of illumination. The differences in chroma (ΔCvis), hue (ΔHvis) and lightness (ΔLvis) between the 25 cells of the conditioned specimen and the corresponding cells of the reference specimen were evaluated. The specimens employed for the comparison are shown in Figure 3 and Figure 4, respectively for “Type 3” product and “Type 4” product. The differences in chroma, hue and lightness were evaluated according to Table A.1 in Annex A of Rif. 2-e, shown for simplicity in Figure 5. The results of the visual analysis are shown in Tables 3-8. The negative value (-1) that can be observed in some cells indicates a slight decrease (barely noticeable) of chroma (ΔCvis) or of lightness (ΔLvis) of the conditioned specimen with respect to the reference one. The -1ye value, that can be observed in some cells, indicates that the conditioned specimen is slightly yellower (barely noticeable) with respect to the reference one. Figure 3. Comparison between the reference specimen and the conditioned specimen– Type 3.

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