BS 530:2010 pdf download – Abrasion resistance of protective clothing material — Test method

BS 530:2010 pdf download – Abrasion resistance of protective clothing material — Test method 7 Procedure of Method 2: Pre-treatment procedure 7.1 Test specimen Select at least four circular test specimens with a diameter of (140 ± 5) mm to fit the abrading table. Cut the same number of felt backings to the same size as the specimens. Exclude the selvedge area at least 100 mm from the edge when cutting the specimens at random from the entire material. For woven fabrics, take the specimens so that they each contain different warp and weft threads. Specimens shall not include seams. 7.2 Setting up the machine 7.2.1 Mounting specimens on abrading tables Carefully position the felt backing on the abrading table and place the specimen over the felt. Compress the felt and specimen on the abrading table with a pressing weight described in EN ISO 12497-1. Fit the clamping ring (or appropriate device) and secure the felt and specimen firmly. Remove the pressing weight. Ensure that, wherever possible, the specimen is retained in a wrinkle-free condition (see 7.2.3). 7.2.2 Mounting the woven wool fabric abradant on test piece holder Using the punch or press cutter take at least four pieces of abradant. Place the ring of the test piece holder in position on the mounting plate provided on the base of the machine. Insert the abradant face side downwards, centrally on the ring. Place the foam backing on top. Place the metal insert carefully and centrally on top of the foam and abradant, so that its hollowed side faces upwards, and press down. Ensure that the abradant is retained in a wrinkle-free condition during the further assembly with the test piece holder. NOTE When screws are used for this assembly the following procedure should be followed: Hold the ring containing the abradant and the metal insert firmly in the mounting plate, start to screw the top of the test piece holder on to the ring, taking care that the screw threads are not crossed. Having started the screwing down operation, use both hands to maintain a continuous downward pressure on the assembly, against the mounting plate. 7.2.3 Wrinkles If the specimen or the abradant cannot be mounted in a wrinkle-free position, the use of the foam or felt backing shall be omitted, but this shall be stated in the test report. 7.2.4 Preparation of the abrasion machine After mounting the abradant...