BS EN ISO 9405-2017 pdf free download.Textile floor of changes in appearance (ISO 9405:2015)
5.3 Large grey scales
Large grey scales (200 mm x 150 mm) for assessing cha nges in colour s ha Il be used.
They comprise five pairs of grey references each representing a contrast corresponding to grade 4 , 0; 3 , 0; 2 , 0; or 1 , 0 (see ISO 105-A02).
NOTE The use of normal (35 mm x 28 mm) grey scales can lead to incorrect assessment and these cannot therefore be used. 6 Selection and preparation of specimens Select specimens for fatiguing and assessment that are representat i ve of the carpet. Select also a corresponding area of at least 20 cm x 20 cm of the unfatigued sample as reference (the borders may also be used as reference).
Mark the specimens with a reference direction ( which can be the direction of production , if known) for aligning them for the assessment.
7 Assessment of change
7.1 Assessors The assessme nt s sha Il be made i nd ependent ly by at l east three experienced assessors .
The number of assessors sha ll be extended to five if the difference between the individual te st results within an assessor team is greater than one grade. Each assessor sha Il grade the specimens independently from the other assessors .
The assessment shall be done by observing the specimens visually at a distance of m at an angle of (90 :t 10) degrees. 7.2 Procedure Ensure th at the specimens have been vacuum-cleaned and conditioned following treatment f or production of changes in appearance (see I SO 10361).
Arrange the fatigued and the unfatigued specimens side by side , with the reference directions the same , on the viewing stand positioned centrally under the illumination device. Lay the selected scale alongside the specimens. Specimens of one article treated in steps of increasing intensity (e.g. in a castor chair test) shall be assessed together.
Always evaluate the specimens with the pile lay (upward) in the direction of the lamps. Assess the level of visua l contrast , or differences , between the fatigued and unfatigued specimens and select the grade with most similar level of contrast in the chosen reference scale. During the assessment , consider the change in surface appearance as defined in 3.1 , assigning the final grade as the integrated average of all the factors.
The appearance retention rating of the specimen is the number of the grade in the five- grade reference scale which most c1 0se ly corresponds to the contrast. Half grades can be assigned if the contrast between the fatigued and unfatigued specimens is judged to be nearer to the (non-existent) half-grade or mid- way , between the two nearest whole grades in the reference scale. Only full and half-grade assessments are permitted.
A rating of5 is given only when there is no difference between the tested specimen and the original materia l. One or more of the factors , as defined can have an overriding influence in the final grade , if so each assessor shall record the factor(s) for information.
7.3 Change of colour In addition to including the influence of colour in the above assessment , a separate assessment of colour change is required. Each assessor shall assess the colour change for each specimen only using the large grey scales as defined in ISO 105-A02.
7.4 Test report
The report shall include the following information:
a all details necessary for identification of the specimens;
b] that the assessment was carried out in accordance with this International Standard;
c the date the test was completed;
d) reference scale selected from Table 1;
e) the grade for the change in appearance for each assessor individually;
f) median of the grades for the change in appearance of all assessors;
g) average of the grades for the change in appearance of all assessors;
h) the grade for the change of colour for each assessor individually;
i) the median of the colour change;
i) any deviations from this International Standard.BS EN ISO 9405 pdf download