BS EN 1849-2:2019 pdf free.Flexible sheets for waterproofing – Determination of thickness and mass per unit area.
1 optical or mechanical effective thickness deffo or detfm (see 3.3 and 3.5) 2 optical or mechanical overall thickness do or dm (see 3.6 and 3.7) pressure: (20+ 10) kPa 4 measuring head: (10土0,05) mm diameter 5 planar measuring surface 6 test specimen 7 backing with hindrance (see 3.4 and 5.1) 8 surface texture not exceeding 0,15 mm in total 9 surface profile (structure) exceeding 0,15 mm in total 10 not waterproofing layer (e.g. adhesive layer or protection foil)5 Determination of thickness 5.1 Principle The effective thickness is determined by a mechanical measuring device unless there is a hindrance. In this case, an optical measuring device shall be used. The hindrance means that the difference between effective thickness and overall thickness is greater than or equal to 0,15 mm and/or that the weight of the backing is greater than or equal to 80 g/m2. The overall thickness is determined by a mechanical measuring device unless there is a hindrance. In this case, an optical measuring device shall be used. The hindrance means that the measuring surfaces are disabled from a good contact with the 2 outer surfaces of the sheet. 5.2 Apparatus 5.2.1 Mechanical measuring device Measuring device, capable of indicating the thickness to an accuracy of 0,01 mm. The measuring surfaces shall be planar and the measuring head has a diameter of (10士0,05) mm including rounded edges exerting a pressure of (20士10] kPa on the sheet surface.5.2.2 Optical measuring device Measuring device, capable of indicating the thickness to an accuracy of 0,01 mm. The reproducibility for the whole optical measuring device (microscope, monitor, measuring software, … is smaller than 0,01 mm. The magnification of the optical measuring device is recommended to be greater or equal than 30. 5.3 Test specimens The test specimens shall be square or circular in form, and have an area of (10 000土100) mm2. Cut from the sheet n test specimens evenly divided over the width b of the sheet, the outer specimens (100土10] mm from the edges.BS EN 1849-2 pdf download.