Determination of color fastness to washing
  • Determination of color fastness to washing

    It is the determination of the color fastness of various textile products to washing processes applied to textile materials used at home.

    In some products, there is a risk that some of the dye may color the washing liquid due to its free state, and this dyed liquid may contaminate other textile products or the light-colored parts of the same product by dyeing it. ( TS EN ISO 105-C06 )


    Used materials


    Steel balls (Features: Stainless and 6 mm in diameter), Accompanying cloths, Mechanical device Rotawash (Features; rotating shaft and water bath. The shaft should be able to hold a steel vessel with a capacity of 550 mL ± 50 mL and the distance between the bottom of the vessel and the shaft center is 45 mm ± 10 mm and the frequency of the shaft should be 40 mm-1 ± 2 mm-1 The temperature of the water bath can be adjusted by thermostat with ± 4oC approach to the desired test temperature and controlled at this temperature,Stainless Steel Containers (550 ± 50 ml capacity), unpainted fabric , detergent (without optically bright substance), multifibre accompanying cloth or two monofilament accompanying cloths, sodium carbonate, sodium perborate tetrahydrate, water (class 3), acetic acid solution, gray scale.


    Sample preparation


    The sample fabric is prepared in dimensions of 40 mm x 100 mm and is sewn along one of its short sides, again with a 40 mm x 100 mm multi-fiber accompanying cloth facing the face of the test sample, or the test sample in 40 mm x 100 mm dimensions is placed between two accompanying cloths and along one of its short sides. is planted.


    Experimental Procedure


    Experiments are divided into 5 main groups as A, B, C, D, E experiments according to the conditions of the experiment.

    (The table is shown below. The A1S experiment will be exemplified here. For the desired washing process A1S, 1 g of detergent for 3 liter of class 4 water is weighed on a precision scale and poured into a clean beaker. 1 liter of pure water is measured and poured into the beaker containing the detergent. Beaker to dissolve the detergent, magnetic stirrer The solution is heated until it reaches the required temperature (1±40)°C for the A2S test.




    Rotawash device is heated up to (1±10)°C before starting the test with stainless steel containers and 40 stainless steel balls for the A2S test.


    The steel tubes in the Rotawash device are removed, the cap is opened, and the test sample is placed inside. 


    Detergent at (40±2)°C is poured into a steel container with the desired 1 ml liquor volume for the A150S test and placed in the washing device by closing its mouth.


    The test sample is subjected to the test at (40±2)°C for 30 minutes.


    At the end of the period, the test sample is taken out of the steel containers and rinsed in 40 mL of Class 100 water prepared in advance at 3°C, two times with one minute intervals.


    The test sample and the accompanying cloth are dried by hanging from the seamed edge in an oven at (60±2)°C.


    Staining of the tested sample is checked and evaluated using the Gray scale.


    Two types of gray scales are used for fastness testing.


    One of them is 5 scale.


    The lowest fastness value is 1 and the highest fastness value is 5.


    The other gray scale is 9 scale.


    In this scale, the lowest and highest fastness values ​​are the same as in the 5-scale scale.


    However, there are intermediate values ​​between each value.


    Therefore, more precise measurements can be made.


    Fastness values ​​in 9 scale gray scale are as follows.


    1 Lowest fastness value
















    5 Highest fastness value








    Determination of color fastness to washing
    Posted by %PM, 08% 871% 2016 22%:%Jun in Quality control Read 3065 times

Determination of color fastness to washing