How long is the sample tested in the xenon lamp weather resistance test box is equivalent to one year of outdoor exposure? This question seems simple, but the answer is complicated. In theory, we can't get a simple number, and multiply it with the test time of xenon lamp weather resistance test box to get the time of outdoor exposure. The reason is not that we have not developed a better test box, but no matter how advanced and expensive your xenon lamp weather resistance test box is, you still cannot find this number. In fact, the environment of outdoor exposure is complex and changeable. The test time in the test chamber and outdoor exposure time are related to the following factors:
1) The geographic latitude of the outdoor exposure field (the closer to the equator, the stronger the ultraviolet ray)
2) Altitude (higher altitude means stronger UV rays)
3) The local geographical environment, for example, the wind speed will affect the dryness of the test sample or the place close to the water source will promote the formation of dew
4) Due to the different climates each year, the impact of the next year ’s weather on the sample in the same area may be twice that of the previous year
5) Seasonal influence, for example, the destructive effect of winter exposure is only 1/7 of summer
6) The orientation of the sample (a deviation of 5 degrees and true north is very different)
7) Whether the sample is insulated or not (outdoor samples are usually aged 50% faster than if not placed on an insulating carrier)
8) Test cycle of the test chamber (radiation time to wet time)
9) Operating temperature of the test chamber (the higher the temperature, the faster the aging)
10) Testing of special materials
11) Spectral distribution of light source (SPD) in the test chamber
Therefore, how long does the sample test in the xenon lamp weather resistance test box correspond to one year of outdoor exposure? It is meaningless to logically talk about the conversion factor between the artificial acceleration of old time and the length of outdoor exposure. The reason is that one is equivalent to a constant environment, while the other is ever-changing. Finding a conversion factor between the two cities is beyond the scope of change. In other words, weather data is relative data. However, you can still get excellent aging test data from the artificial accelerated aging test. But you must recognize that the data is relative data, not absolute data. The reliable data you get from the test in the test box is the relative aging level of the tested material relative to its chemical material.
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