Determination of color fastness to weather conditions
  • Determination of color fastness to weather conditions




    It covers the determination of whether the colors of all kinds and types of textile materials are sensitive to light when wetted by exposing them to the weather conditions created by a xenon arc lamp in a cabinet. ( TS 4460 EN ISO 105-B04 )

    Used materials

    Xenon Arc Device (Light Source; Xenon arc lamp, Light Filter; Glass filter, Heat Filter; IR Filter, UV filter)


    Radiometer (Measures the amount of radiation and light) (The radiometer is the instrument used to measure the light energy is called a radiometer. The tool that will measure the light energy in the environment and convert it to motion energy is called a radiometer. It is a freely rotating glass bell with four leaves that is not affected by the air. If one side of the leaves is black and the other side is white. )








    Temperature Sensor; Black standard thermometer (BST)


    Reference Blue Wool (1 to 8) Described in ISO 105 B01


    Opaque cardboard or aluminum sheet


    Test specimen holders


    Glass plate holder for blue wool


    Gray Scale.


    Sample preparation


    Two test samples are cut from the test sample fabric in the size of the gripper apparatus.


    Test specimens are stapled to opaque cardboard or attached with glue.


    The test specimens attached to the opaque cardboard are attached to the holder apparatus.


    A (1 x 8) cm sample is cut from each of the blue wool references (from 1 to 2,5) and stapled to the opaque cardboard in order or attached with adhesive.


    The 1/3 parts of the prepared blue wool references are closed and placed on the holder inside the glass plate that prevents the references from getting wet.


    Experimental Procedure


    A glass filter (UV) should be placed between the xenon arc lamp and the sample and blue wool references to reduce ultraviolet rays.


    Heat filters should be placed between the light source and the sample and blue wool references to reduce the infrared radiation intensity.


    Thus, 6 IR and 1 UV filters are placed on the device and these filters are defined in the program of the device.


    Before starting the test, the tank at the bottom of the device is filled with pure water (deionized water).


    Prepared blue wool references and test specimen holders are placed in the device.


    Both are exposed to the weather with the same xenon arc lamp.


    Test specimens are exposed to the following reproducible test conditions.


    Water spray time : 1 minute


    Drying time: 29 minutes


    Blue wool references are protected from spray water by a glass plate and exposed to light with the same xenon arc lamp used to illuminate the test specimens.


    The top and bottom of the glass enclosure should be open to allow good air circulation.

    Samples are tested in three different methods.



    METHOD 1



    This method includes inspecting test samples and controlling the period of exposure to weather conditions.


    METHOD 2



    This method is used when multiple test pieces must be tested together.


    The main feature of this method is to control the exposure time to air by examining the blue wool references.


    The test specimens and the blue wool references are exposed to weathering until the contrast between the unexposed and exposed parts of reference 6 is equal to 4 on the gray scale.


    One sample is taken from each pair of test pieces.


    These samples are then covered with the second 1/3 of the blue wool reference with an additional opaque cardboard.


    The test exposure continues until the contrast between the fully exposed and unexposed portions of reference 7 is equal to 4 on the gray scale.


    The remaining test pieces and references are then taken.


    Samples of the original fabric that has not been tested with test samples exposed to air are prepared for evaluation.


    METHOD 3



    This method is preferred if the tests are applied to check the color fastness at the agreed light energy level.




    Before the test samples are placed for evaluation, they are dried in air and at a temperature not exceeding 60 ºC.


    The test specimens subjected to the test are cut at least 15 mm x 30 mm in size.


    The test samples are placed in the color comparison cabinet side by side with a piece of original fabric cut in the same shape and size as them.


    The magnitude of the contrast between the test specimens exposed to air and the original fabric is evaluated using the contrasts that occur in the blue wool references exposed to the weather conditions for the same period of time.


    The reference number showing the closest contrast to the contrast in the test sample gives the color fastness value.


    An appropriate half-fastness value is given if the contrast is approximately halfway between the two blue wool references.


    If the color change is greater than 4-5 on the gray scale, the textile material is considered to be light sensitive in the wet state.


    If the color change is 4-5 or 5 according to the gray scale, it is considered that the textile material is not sensitive to light in the wet state.


    The term color change refers not only to fading, but also to a change in colour, color depth and hue, or any change in color characteristics.


    Color difference; a change in the color or the lightness/darkness of the color is indicated by adding the following abbreviations to the numerical color fastness value.


    Bl: More blue


    Y: More yellow


    G: Greener


    R: More red


    D: More matte


    Br: Brighter


    If there is a change in color depth as well as a change in color, this The situation can be represented by the following abbreviations.


    W: Weaker


    Str: stronger 





    Determination of color fastness to weather conditions
    Posted by %PM, 29% 667% 2016 18%:%May in Quality control Read 4530 times

Determination of color fastness to weather conditions