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See Chinese contents: GB/T 5137.4-2020 GB/T 5137.4-2020: Test methods of safety glazing materials used on road vehicles -- Part 4: Determination of solar characteristic
This Part of GB/T 5137 specifies the method for determination of solar characteristic of safety glazing materials used on road vehicles, including solar ultraviolet transmittance, solar direct transmittance, solar direct reflectance, solar direct absorptance, solar infrared direct transmittance, solar infrared direct reflectance, solar infrared direct absorptance, total solar energy transmittance, total solar infrared thermal energy transmittance.
