What desiccant should be used in car headlights?

Because the air in the car light will be heated and expanded when the car light is in use, it needs to be connected with the air outside the car, so that the water vapor in the air will enter the car light, which will cause the inside of the car light in humid weather. Also rather humid. At this time, after the lamp is turned on, the material in the lamp is heated, and more moisture in the material is released. At this time, if the temperature outside the lampshade is relatively cold, it is easy to produce water mist or water droplets on the inner surface, which will illuminate the lamp. effect has an impact.

The practice in the automotive industry is to use a desiccant to remove the water vapor in the headlights. Many brands of headlights have put a desiccant in them to avoid excessive fog and water droplets.

However, because the lamp shade is transparent and the use process is high temperature, the use conditions of the desiccant are also very strict, especially if the moisture that the desiccant has absorbed will evaporate again when heated, which will cause fog and water droplets. The problem is more serious, so it is necessary to use a special desiccant for headlights to meet the requirements.

According to the statistical data of the automobile industry, the desiccant used for car headlights is magnesium chloride desiccant, which can ensure the moisture absorption capacity and moisture absorption time for a long time, and the water vapor will not volatilize at high temperature, so as to ensure the high temperature environment of the headlights. The desiccant package will not be damaged in harsh environments such as accidental water ingress and instant car lights, so it does not affect other components in the light, and the price is very cheap.