The standard "ISO 105 G01 Textiles - Tests for colour fastness - Part G01: Colour fastness to nitrogen oxides" published by the International Organization for Standardization (ISO) describes two methods for determining the colour resistance of textiles of all types and forms to the effects of nitrogen oxides formed during the combustion of gas, coal, oil and similar fuels and when air is passed over heated filaments. The severity of these two tests varies, depending on the result obtained, one or both of them are used.
When performing tests, textile samples are exposed to nitrogen oxides in a closed container until one or three test control samples exposed simultaneously with the test samples change color to a predetermined extent. The color change of each sample is evaluated with a gray scale.
Equipment and materials used in these tests include:
For testing textiles, the standard temperate atmosphere, i.e. 65 percent plus/minus 2 percent relative humidity and 20 degrees plus/minus 2 degrees temperature, is used for conditioning and testing.
If the textile to be tested is fabric, a 40 mm x 100 mm sample is used. If the textile to be tested is yarn, knit it into fabric and use a 40 mm x 100 mm piece or wrap it tightly around a frame of rigid inert material measuring 40 mm x 100 mm to form a layer on each side that is just the thickness of the yarn. If the textile to be tested is loose fibre, sufficient quantity is combed and compressed to form a layer measuring 40 mm x 100 mm and the layer is sewn to a piece of cotton fabric conforming to ISO 105-F to support the fibres. A 40 mm x 100 mm sample is cut from the test control fabric and 40 mm x 100 mm samples are cut from the undyed fabric.
As a preliminary treatment, each specimen is mounted by fixing its shorter side to the radial arm of the apparatus frame by means of glue or clips. When glue is used, it should be allowed to dry properly.
A maximum of 40 samples, each measuring 100 mm x 12 mm, can be mounted in this way for a test. If fewer samples are to be tested, a total of 12 are filled with pieces cut from undyed fabric of the same type. The test control sample is fixed in the test control holder. The samples and the test control sample are conditioned for at least 12 hours in the atmosphere specified in this standard.
The frame containing the samples is placed inside the glass cylinder and then placed on top of the hell jar. The holder containing the test control sample is passed through the upper stopper hole on the side and the fan is adjusted. The rotation frequency of the fan is set at 200 min-300 min and the device is protected from bright light. 0,65 ml of nitric oxide is injected into the hell jar for each liter of exposure chamber capacity.
Following the preliminary preparation, a single cycle test or three cycle test is applied as needed. Nu tests are conducted in a standard atmosphere. If a conditioning room where the entire test can be performed is not available, the sample can be conditioned in a standard atmosphere for the test using a suitable apparatus and tested at room temperature.
Among the numerous tests, measurements, analyses and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the “ISO 105 G01 Textiles - Colour fastness tests - Section G01: Colour fastness to nitrogen oxides” standard with its trained and expert staff and advanced technological equipment.
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