The GB/T 10485-2007 standard outlines the procedure for conducting weathering tests on xenon lamps used in motor vehicle lighting and optical signaling devices (categories M, N, and O), as well as trailers. This document provides a detailed explanation of the test process and requirements.
First, the scope of the method applies to illumination devices (excluding headlights and front fog lamps) and optical signal devices. It is specifically designed to evaluate the radiation resistance of plastic optical components used in these devices.
Second, the equipment required includes a xenon weathering test chamber that simulates a black body radiation spectrum with a temperature range between 5500K and 6000K. This ensures that the light emitted closely resembles natural sunlight.
Third, the samples used in the test should consist of three new plastic light mirrors or their corresponding material samples. These samples must be representative of the actual components used in the final product.
Fourth, the test conditions and procedures are as follows:
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 set to 1200 W/m² ± 200 W/m², and the total radiant energy exposure should reach 4500 MJ/m² ± 200 MJ/m².
5. During the test, the sample should undergo a cycle of water spraying for 5 minutes followed by drying for 25 minutes. This cycle is repeated 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, the results are determined based on two main criteria:
1. After the test, the outer surface of the sample must not show any cracks, scratches, chips, or deformation.
2. When performing three measurements according to the method described in Appendix D of GB4599, the average change in transmittance Δtm should not exceed 0.020. The calculation is done using the formula Δt = (t2 - t3)/t2.
This comprehensive testing protocol ensures that the materials used in vehicle lighting and signaling systems can withstand long-term exposure to environmental conditions, maintaining both functionality and safety over time.
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