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ABRASION RESISTANCE EN 13329:2006 (annex F) (adapted)

1. TOOLS
1.1 Abrasion tester consisting of: 1) sample holder in the form of a disk which rotates in a horizontal plane at a frequency of 58-63 rpm and to which the sample can be clamped with a clamping screw; 2) abrasive wheels, two cylindrical rubber-covered wheels of width 12.7 (+/-0.1) mm and diameter 50 mm which rotate freely about a common axis; 3) holding and lifting device, for the abrasive wheels, so constructed that each wheel exerts a force of 5.4 (+/-2) N on the sample; 4) revolution counter; 5) suction device, so fitted that 2 nozzles are over the abraded area of the sample (one nozzle shall be situation between the wheels and the other diametrically opposite; the centres of the nozzles shall be 77 mm apart and 2 (+/-05) mm from the surface of the test specimen; when the nozzles are closed there shall be a vacuum of 1.5-1.6 kPa)

1.2 Abrasive paper strips 12.7 (+/-0.1) mm wide in the machine direction by approximately 160 mm long, and having the following composition: 1) paper grammage of 70-100 g/m2; 2) open coated 180 grit aluminum oxide having a particular size that will pass through a sieve of aperture 100 μm and remain on a sieve of aperture 63 μm; 3) adhesive backing

1.3 Calibration plates (Taber S-34 or equivalent), of rolled zinc sheet
1.4 Balance accurate to 0.01 g
1.5 Organic solvent immiscible with water
1.6 Clean, soft cloth
1.7 TAPPI size estimation chart

1.8 Swedish Standards Institution Article No. 21824

2. SAMPLING
100x100 mm samples taken from 1 board (two centred 10 mm from the short edges and one exactly in the centre of the board)
Clean the surface of the test specimens with an organic solvent which is immiscible with water. Using a marker pen, mark the surface of each sample with 2 lines mutually at right angles so that the surface area is divided into quadrants

3. ENVIRONMENTAL CONDITIONS
Temperature: 23 (+/- 2) °C
Relative humidity: 50 (+/-) 5%

4. TESTING PROCEDURE
4.1 Confirm that abrasive paper strips are in range (120 mg+/- 20 of weight loss when preconditioned, unused sand paper abrades the zinc plate on 2 consecutive 500 cycles abrasion procedures)

4.2 Perform the test immediately after calibration. Prepare two wheels with preconditioned unused abrasive paper from the same batch previously approved by calibration. Fit the wheels to the tester and reset the revolution counter to zero. Clamp the first sample in the holder (ensure that the sample surface is flat). Lower the wheels, start the suction device and start the abrasion process

4.3 Examine the test specimen for abrasion after each 100 revolutions and renew the abrasive papers after every 200 revolutions. Continue the test in this way until the initial wear point (IP) is reached. The initial wear point (IP) is that point at which the fist clearly recognizable wear-through of the print appears and the sub-layer becomes exposed in 3 quadrants. The initial wear point is reached when there are areas of at least 0.60 mm2 wear-through in 2 quadrants and an area of 0.60 mm2 wear through become visible in a third quadrant. The sub-layer for printed patterns is the background on which the pattern is printed. For plain colours it is the first layer of different colour

4.4 Record the number of revolutions as the IP-value. Repeat the test immediately using the 2 remaining samples. Calculate the average of the IP values obtained from the 3 test specimens to the nearest 100 revolutions


5. ASSESSING TEST RESULTS

Express the abrasion resistance of the samples as one of the abrasion classes:

AC1 ≥ 900 revolutions
AC2 ≥ 1500 revolutions
AC3 ≥ 2000 revolutions
AC4 ≥ 4000 revolutions
AC5 ≥ 6000 revolutions
AC6 ≥ 8500 revolutions

Passing requirement per the sales contract




 
  
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