EN 14323-2017 pdf download.Wood-based panels – Melamine faced boards for interior uses – Test methods.
5.4.3 Test pieces
The test piece shall be the board under test, as received.
5.4.4 Procedure
Place the board, decorative face uppermost, on the inspection table and wipe it free of any loose contamination, if necessary, with a soft cloth and any suitable cleaning agent if necessary. Inspect it from the distance required (specified in 5.4.1) for defects such as smudges, smears, finger-prints. scratches, foreign particles, damage or any other form of blemish evident within the decorative surface.
In case of cut to size panels the Inspection shall be performed on the edges too.
The evaluation of the total area of spot-type defects in square millimetres and of the total length of hairlike defects in millimetres may be carried out with the help of the Tappi Size Estimation Chart1) or with an equivalent system. In case of dispute the Inspection shall be carried out by three observers using the Tappi Chart or an equivalent system.
The inspector shall have normal vision, corrected if necessary. No magnifying glass shall be used in viewing the sheet. In cases of doubt or dispute, three observers are required for the visual assessment. All observers shall have good colour vision. In case of three observers, the reported rating for the test surface shall be the average to the nearest nominal value.
5.4.5 ExpressIon ol results
Record all defects identifying type, number and size of defects and sum up surfaces and length.
The admissible size of defects is based on a maximum contamination area equivalent to a unit of defects and is proportional to the standard delivery size of the manufacturer. The total admissible area of contamination may be concentrated in one spot or dispersed over an amount of smaller defects.
In case of pre-cut panels the cumulative defect is referred to the standard delivery sizes of the manufacturers or amount of delivery.
EXAMPLE Permitted unit of defect (see EN 14322) in this sample is 2 mm/m2 Standard delivery size of the manufacturer 5 000 mm * 2 000 mm
Points:
The permissible total error (TE) is calculated as follows:
TE = Board length x Board width * Permitted unit of defect = 5 000 mm 2 000 mm * 2 mm/m2 = 20 mm2
The following errors are therefore permitted:
1×20mm1dclect.or
2×l0mmdefect.or
5.5.1 Principle
increasing loads are applied in specified steps to a diamond scratching point of defined geometry.
The resistance to scratching of the melamine faced board under test is expressed as a numerical rating which defines the minimum applied load which is producing a continuous surface scratch. The test result is verified by visually confirming that the next higher load-step produces a continuous scratch.
5.5.2 Apparatus
Scratch testing apparatus and viewing enclosure as described in EN 438-2:2016, 25.3.
5.5.3 Test pieces
Cut a test piece 100 mm x 100 mm from the board under test. Wipe the surface using cotton fabric impregnated with a solvent such as acetone. It is important that, once cleaned, the surface is not fingered in the test area. Before making the scratch test store the test piece for 4 days in the standard atmosphere according to Clause 4.
5.5.4 Procedure
Follow the procedure in EN 438-2:2016, 25.6 with the following modifications.
Start the test by making two scratches at 1,0 N with a spacing of approximatelyl mm between the scratch marks. On the same test piece repeat this procedure with loads in increment of 0,5 N up to a load of 4 N leaving a space of approximately 3 mm between each pair of scratches. Place the scratched samples in the standard atmosphere, defined in Clause 4, for 24 h before final inspection,
5.5.5 Expression of results
During the examination, the operator shall ensure that the double circle of scratch marks selected is
truly> 90 % continuous.
The examination of the surface should take no longer than 10 s.
Record the minimum load giving a continuous mark visible after 24 h in the standard atmosphere. In cases of dispute, three observers shall view the test piece and report their results independently; the final result shall be the average of the three reported values, rounded to the next 0.1 N.
5.6 Resistance to staining
5.6.1 Principle
Test pieces are left in contact with a series of staining agents which are likely to be encountered in everyday use. The time and conditions of contact are specified for each staining agent. At the end of the specified contact period the test pieces are washed and examined for residual surface marks.EN 14323-2017 pdf download.
EN 14323-2017 pdf download
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