The GB/T 10485-2007 standard outlines the procedure for conducting weathering tests on xenon lamps used in external lighting and optical signal devices of motor vehicles (M, N, and O categories) as well as trailers. Below is a detailed description of the test process and requirements:
First, scope of application:
This method is specifically designed for evaluating the radiation resistance of plastic optical components in illumination devices (excluding headlights and front fog lamps) and optical signal devices.
Second, equipment required:
A xenon weathering test chamber is used, which produces a spectral energy distribution similar to that of a black body with a temperature range of 5500K to 6000K. This ensures that the light emitted closely mimics natural sunlight.
Third, sample preparation:
Three new samples of plastic light mirrors or their corresponding material samples are required for testing.
Fourth, test conditions and procedures:
1. The black panel temperature at the same horizontal level as the sample should be maintained at 50°C ± 5°C.
2. A suitable filter must be placed between the light source and the sample to reduce the impact of radiation below 295 nm and above 2500 nm.
3. The sample should rotate around the light source at a speed of 1 to 5 revolutions per minute.
4. The irradiance on the sample should be 1200 W/m² ± 200 W/m², and the total radiant energy received should be 4500 MJ/m² ± 200 MJ/m² during the exposure.
5. During the test, the sample should undergo a cycle of water spraying for 5 minutes followed by drying for 25 minutes. This cycle continues until the test concludes. The distilled water used for spraying should have a conductivity of less than 1 mS/m at 23°C ± 2.5°C.
Fifth, evaluation of results:
1. After the test, the outer surface of the sample must show no cracks, scratches, chips, or deformation.
2. When conducting three tests according to the method outlined in Appendix D of GB4599, the average change in transmittance Δtm should not exceed 0.020. The transmittance change is calculated as Δt = (t₂ - t₃)/t₂.
This standardized procedure ensures that the materials used in vehicle lighting and signaling systems can withstand long-term exposure to environmental stresses, including UV radiation, moisture, and temperature fluctuations. It plays a crucial role in quality assurance and product durability assessment in the automotive industry.
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