BS EN 13523-29:2017 pdf free.Coil coated metals – 1 Test methods.Resistance to environmental soiling (Dirt pick-up and striping)
BS EN 13523-29 The area of the rack normally used for the exposure of panels to the 5° orientation is used to install a sheet made of UV stable polymeric material (e.g. polycarbonate]. This sheet forms the collector of the atmospheric soil and is angled on the upper surface of the rack at between 10° and 12° with respect to the horizontal plane to control the rate of run-off of rainwater. The machining imparts grooves of 3 mm width and 3 mm depth at a separation of 3 mm extending along the surface and over the rounded edge to direct rainwater onto the panels in rivulets (see Figures 1 and 2).The upper row of the 90° North facing exposure area of the rack is used to fix the panels, having removed the existing overhang. Two rows are used for this exposure if the panels are longer than 200 mm. The test panels are positioned so that the top edge is in uniform contact with the bottom edge of the collector overhang.The test samples shall be flat and free from contamination. Sampling shall be performed in accordance with EN 13523-0. Sample dimensions shall be 100 mm x (200 mm to 400 mm).If coil production line samples are used these should be cut so as to have the longest dimension in the direction of rolling.In addition to the test panel, expose two reference panels for each test campaign: one of known good and one of known poor performance. This allows for comparative evaluation in various atmospheric conditions.The duration of the test is typically three months and shall be no longer than six months. The duration of the test shall be for a continuous period to avoid other weathering effects, e.g. corrosion, photo degradation, etc. To minimize seasonal effects, the start date should be noted.At the end of the test period there shall be sufficient separation in performance between the reference panels so as to allow a ranking of the test panels. If not, the test will be restarted with new panels.BS EN 13523-29 pdf download.