3.2file specimen
portion of the material to be tested which is stored under conditions in which it is stable and which is used for comparison between the exposed and unexposed states
3.3artificial accelerated weathering
exposure of a material in a laboratory weathering device to conditions which may be cyclic and intensified compared with those encountered in outdoor or in-service exposure
Note 1 to entry: This involves a laboratory radiation source, heat and moisture (in the form of relative humidity and/or water spray, condensation or immersion) in an attempt to produce more rapidly the same changes that occur in outdoor exposure.
Note 2 to entry: The device may include means for control and/or monitoring of the light source and other weathering parameters. It may also include exposure to special conditions, such as acid spray to simulate the effect of industrial gases.
3.4artificial accelerated irradiation
exposure of a material to a laboratory radiation source intended to simulate window-glass-filtered solar radiation or radiation from interior lighting sources and where specimens may be subjected to relatively small changes in temperature and relative humidity in an attempt to produce more rapidly the same changes that occur when the material is used in an indoor environment
Note 1 to entry: These exposures are commonly referred to as fading or lightfastness tests.
3.5reference material
material of known performance
3.6reference specimen
portion of the reference material that is to be exposed
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