Color Fastness to Light: Analysis of 5 Testing Methods in ISO 105-B02



ISO 105-B02 is a testing method for determining color fastness to artificial light, which uses Xenon arc lamp as light sources to simulate the exposure of fabrics to sunlight. It not only provides five testing methods but also includes five appendices, which are quite complex in content. Therefore, operators often encounter many problems in actual applications.

Test Principle of color fastness to light

A specimen of the textile to be tested is exposed to artificial light under controlled conditions, together with a set of reference materials. The color fastness is assessed by comparing the change in color of the test specimen with that of the reference materials used.

Reference Materials and Apparatus

Reference Materials
ISO 105-B02 mentioned two sets of blue wool reference totally, of which the blue wool reference 1~8 is preferred in Europe and the blue wool reference L2~L9 in America. It is noteworthy that the results from these two sets of references are not interchangeable.
Apparatus--Xenon Arc Tester
  • Light source: Xenon lamp is used as light source, which provide optimal spectral power distribution across the lamp’s entire 1500 hours service life.
  • Temperature: One of two types of black-coated temperature sensor, either a black-standard thermometer (BST) or a black-panel thermometer (BPT), is used to simulate the maximum temperature that the sample surface can reach. And the thermometer shall be mounted in the same plane and orientation as the test specimen.
  • Humidity: The presence of moisture can have a significant effect in accelerated laboratory exposure tests. The apparatus shall have the means for providing and controlling moisture to specimens by humidification of the chamber air.
  • Covers: Covers shall be made from thin opaque material, for example, high-grade steel, thin sheet Al or cardboard covered with Al foil, for partial covering of samples and references.
  • Color matching lamps: in accordance with CIE Publication No. 51.
  • Assessment cabinet: complying with ISO 105-A01.
  • Sample mounting card: free of optical or fluorescent brightening agent.
  • Assessment mask: complying with ISO 105-A01. In order to obtain reliable test results using ISO 105-A02, the test specimen(s) shall be masked with a material that is identical in color to the sleeve that is used to mask the grey scale (5.2.9).
  • Grey scale: for assessing change in color, complying with ISO 105-A02.

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