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 in the test piece holders and the specimen on the abrading tables, place the test piece holder guide plate in position on the Martindale apparatus. Correctly position the test piece holders and spindles with additional loading pieces (9 kPa or 12 kPa) in their respective work stations. Use pressure spindle 9 kPa unless otherwise specified in the requirement standard. NOTE Spindles and additional loading pieces (9 kPa or 12 kPa) are described in EN ISO 12947-1.
7.3 Procedure Preset intervals of rubs to the abrasion machine as the relevant requirement standard states. After preparing the Martindale machine, set the first test interval from the requirement standard. Switch on the machine. Continue the abrasion test without interruption until the preselected number of rubs is reached. Carefully remove the test piece holder with the mounted specimen from the testing machine, and without damaging or disturbing the specimen, clean the debris from the specimens and abradants with compressed air. Regular removal of abrasion debris and replacement of the abradant are necessary to obtain reproducible test results. Replace the holders in the machine and start the next test interval. Continue this test and cleaning sequence until the total amount of rubs is reached.
8 Method of assessment
The end of the testing shall be stated in the relevant product standard or specification.
NOTE The following end points are recommended:
a) a judgement of specimen breakdown in case of method 1;
b) a number of rubs in the case of method 2.
9 Test report
The test report shall at least include following information:
a) description of the material;
b) reference to this standard and the method of test;
c) standard atmosphere;
d) pressure applied, i.e. 9 kPa or 12 kPa;