Color stability of SFIBRAL panels is tested according the standard ASTM G155-13 – Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials.
This practice covers the basic principles and operating procedures for using xenon arc light and water apparatus intended to reproduce the weathering effects that occur when materials are exposed to sunlight (either direct or through window glass) and moisture as rain or dew in actual use.
The test values differ depending on colour, but even after 3000 h testing, which is equivalent to 3 years, most colours are still within dE<1. It means, that any colour change is hardly visible with a human eye.