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SCRATCH RESISTANCE EN- 438-2-2005

1. TOOLS
1.1 Contrast medium
1.2 Cotton fabric
1.3 Scratch testing apparatus
1.4 Electronic balance 

2. SAMPLING
1 100x100 mm
Wipe the sample with cotton fabric impregnated with a solvent such as acetone. Once cleaned, the tested surface should not be fingered

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

4. TESTING PROCEDURE
4.1Condition the sample for minimum 72 hours
4.2 Make sure the stand of the apparatus is standing horizontally. Adjust the height of the arm so that it is horizontal when the diamond point rests on the sample
4.3 Start the test by making 2 scratches at 1,0 N load with a spacing of 1 mm to 2 mm between the scratch marks


On the same sample, repeat this procedure with loads of 2,0, 4,0 and 6,0 N, leaving a space of 3 mm to 5 mm between each pair of scratches


Remove the sample from the apparatus and rub the entire scratch area of the surface with a suitable contrast medium so that is engrained in any scratches
Carefully wipe the surface with clean cotton fabric to remove any excess contrast medium which is not engrained in the scratches
View the sample from a wide range of angles


Examine the surface to determine the lowest load for which an almost continuous (>90%) double circle of scratch marks can be seen

5. ASSESSING TEST RESULTS

The scratch resistance of the sample shall be expressed in accordance with the following rating scale:

 

Discontinuous scratches, or faint superficial marks, or no visible marks

> or = to 90% continuous double circle of scratch marks clearly visible

Rating 5

6 N

> 6N

Rating 4

4 N

6 N

Rating 3

2 N

4 N

Rating 2

1 N

2 N

Rating 1

-

1 N

 
  
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