ISO 105-B02

Chamber Parameters

Chamber conditions require controlling effective humidity via specific wool control fabrics to match environmental degradation rates. Standardized optical filters modify the xenon spectrum to replicate sunlight passing through window glass.

Color Control

Color change evaluation relies on visual comparison against grey scales or spectrophotometric color difference measurements expressed in CIELAB units. Laboratories report fastness values relative to the blue wool reference that shows equivalent fading during test exposure cycles. Maintaining strict calibration of black standard thermometers prevents thermal degradation from distorting photochemical fading scores.

Testing Boundary

Testing under this standard measures light resistance alone and does not evaluate combined weathering effects from rain, condensation or atmospheric ozone. Photoreactive chemical treatments like optical brighteners can yield variable fastness ratings depending on test humidity settings.