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G155 Weathering Cycle for MIL-PRF-8625F

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Q. Greetings Friends
I've been tasked to look into setting up our Xenon Lamp based Accelerated Weathering Device (AWD) for testing our Anodizing, and making sure that we are testing correctly in accordance with MIL-A-8625 / MIL-PRF-8625 [affil link or DLA] F.

The MIL Spec. doesn't list a specific Cycle out of the ASTM G155 [affil link] Spec. that it references. It simply states that the Cycle should not alternate between a wet and dry environment, and then run for 200 hours.

However, ASTM G155, provides with 13 difference cycles, and yet it doesn't wish to imply a recommendation, meaning that it should be left to the referencing Spec. to dictate either one of these Cycles, or a specific set of parameters. These Cycles include more than just light, and even at various nanometers for the light itself. So, what I -do- know, is that the total runtime should be 200 hours, but I don't know under which parameters.

The parameters are as follows:
Filter: (Daylight/Window Glass/Extended UV)
Irradiance & Wavelength: (X) W/(m2· nm) @ (X) nm
Black Panel Temperature: (°C)
Relative Humidity: (%)
Chamber Air Temperature: (°C)

If anyone have experience in testing MIL-PRF-8625F, Class 2 Lightfastness and the parameters for the AWD, then kindly reach out with a tip or a hint towards the correct settings.


M Stammerjohann
- Horsens, Denmark
April 28, 2023

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