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European exposure conditions and US exposure conditions in the new version of GB/T8427

2022-12-23

The new version of GB/T 8427 Tests for Color Fastness of Textiles to Artificial Light - Xenon Arc has been produced following the review and adoption of the ISO 105 B02:1994 standard and its revision list for GB/T 8427- 1998. In the textile industry, GB/T 8427 is a test method widely used in the detection of color fastness to light. The main principle is to use the light source of a xenon lamp to simulate the color of textiles in the atmospheric environment, which is accelerated by factors such as light. . The xenon lamp aging test chamber is the experimental equipment, which can be provided by QINSUN Instruments Co., Ltd. Customers in need are welcome to inquire.

1. Blue wool standard sample:

In section 6.1 of the new GB/T 8427 standard it is pointed out that the European exposure conditions use standard 4.1. 1 Blue wool standard samples 1~8 specified in section 1-8; be there in paraAlso note 6.2 of the standard that the US blue wool standard exposure conditions using samples L2~L9 specified in section 4.1.2 of the standard. Blue wool standards 1~8 and L2~L9 are similar, but when comparing the test results obtained with different blue wool standards, it should be noted that the fading performance of the two groups of blue wool standards may differ. Therefore, the results of the two sets of standard samples are not interchangeable.

2. Requirements for irradiation:

In the standard chapter 4.2.1.1 Air cooled xenon lamp equipment the requirements for the filter (Window IR filter): Placed between the light source and the sample and the blue wool standard to stabilize the attenuation of the UV spectrum. The light transmittance of the filter glass used is at least 90% between 380nm and 750nm and is reduced to 0 between 310nm and 320nm. At the same time, the amount of infraredred radiation in the xenon arc spectrum are steadily reduced.

In the chapter 4.2.1.2 Equipment for water-cooled xenon lamps, two types of filters are described, both of which must contain an inner and outer filter glass to collect and direct the flow of cooling water. Filters are placed between the light source and the sample and the blue wool standard so that the UV spectrum and part of the IR spectrum can

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Stable decay. One corresponds to European exposure conditions where both the inner and outer filters must be IR filters and form a filter system (Window IR filter) with the window glass cover. The transmission of the filter system is at least 90 between 380nm and 750nm. %, and it drops to 0 between 310nm and 320nm. The other corresponds to exposure conditions in the United States, where the inner filter must be borosilicate glass and hThe transparent soda-lime glass outer filter (Window B/SL filter), which can block the spectral radiation of lower wavelengths, so that The sum of the spectral radii that reaches the sample is approximately equal to that after passing through the ordinary window glass.

The Window IR Filter mentioned above and WindSee Table 1 below for the light intensity cut-off point and suitable standard of the ow B/SL filter.

Filter Name

Table 1 Comparison of Window IR Filter and Window B/SL Filter

However, either For air-cooled or water-cooled xenon lamp equipment, it is recommended that the irradiance (radiant energy per unit area) measured by an irradiance meter be 42 W/m2 (wavelength at 300-400 nm) or 1.10 W/m2 (wavelength at 420 nm).

3. Requirements for temperature and humidity:

In the chapter 6.1 European exposure conditions of the standard, the requirements for normal exposure conditions are: mediume effective humidity, humidity control standard sample The color fastness is grade 5 and the temperature of the black spot is 50°C.

In the chapter 6.2 American Exposure Conditions, the requirements for exposure conditions are: blackboard temperature (63 ± 1) ℃, relative humidity in the test chamber (30 ± 5)%, low effective humidity, humidity. The color fastness of the control standard sample is class 6-7.

4. Comprehensive Equipment Requirements:

If it is necessary to meet both the European exposure conditions in GB/T 8427 and the US exposure conditions, the test equipment requirements are Yes : Equipped with blue wool standard samples 1~8 and L2~L9 at the same time, equipped with Window IR filter and Window B/SL filter at the same time, equipped with black panel thermometer and black standard thermometer at the same time. Specifically, the standard European exposure conditions and the US exposurescounting conditions performed with the parameters in Table 2 below.

Table 2 Specific test parameters of European and American exposure conditions

That is, xenon lamps that meet the test parameters of European and American exposure conditions in Table 2 The sun-dryer really complies meets the requirements of the new GB/T 8427 standard.

Through the interpretation of the new GB/T 8427 standard, it is not difficult to discover that this widely used textile standard actually contains two different test conditions: European exposure conditions and US exposure conditions, i.e. known as the European standard and the US standard. The two exposure methods were compared in terms of blue wool standard sample, filter, irradiation, temperature and humidity.

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