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4.2 Weathering Resistance W(s) (Surface Method)
This test is carried out by placing freshly polished glass plates in a chamber at +50°C, 85% humidity for
24 hours. If the glass surface is severely attacked, another 6 hours test is carried out with new test pieces.
A classification into four groups is then undertaken by inspecting the treated surface through a 50x microscope
as per table 5.
| Group |
Classification |
| 1 |
When there is no fading on the glass exposed in the chamber for 24 hours - inspected at 6000 luxes |
| 2 |
When there is no fading observed on the glass exposed in the chamber for 24 hours at 1500 luxes but fading is observed at 6000 luxes |
| 3 |
When fading is observed on the glass exposed in the chamber for 24 hours - inspected at 1500 luxes |
| 4 |
When fading is observed on the glass exposed in the chamber for 6 hours - inspected at 1500 luxes |
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