The aluminum reflector cups inside the car LED headlights are prone to oxidation and discoloration due to long-term exposure to air and moisture, which reduces the brightness of the headlights. The vacuum evaporation of silicon oil protective film is a necessary process in car lamp manufacturing. It relies on the silicon-based film to isolate oxygen and moisture, extending the lifespan of the lamps by more than ten years.
The production of car lamps adopts an integrated vacuum coating process. After the aluminum layer is evaporated, the silicon oil gas is simultaneously ionized and deposited onto a transparent silicon dioxide film. The film thickness is only 50-150 nanometers, completely not blocking the light, and the light transmittance remains above 98%. The silicon oil coating is resistant to acids and alkalis and UV rays. The outdoor temperature difference and rain and water vapor cannot penetrate the film layer, eliminating the oxidation and fogging of the reflector cups, and solving the safety hazards of old car lamps such as brightness reduction and insufficient night lighting during driving.
Ordinary non-silicon-protected car lamps will turn yellow and darken after 2-3 years of use. With the silicon oil vacuum coating model, the brightness of the car lamps will not decrease by less than 5% within the 10-year warranty period of the entire vehicle. The silicon oil coating also enhances the scratch resistance of the plastic base material of the lamp cover, and minor friction during transportation and washing will not cause scratches.
Industry research shows that the demand for vacuum coating silicon oil by domestic car lamp manufacturers will increase by 24% in 2026. The penetration rate of LED headlights in new energy vehicles has increased, further driving the demand for high-end optical-grade silicon oil. Domestic optical-specific IOTA silicon oil meets the vehicle-grade standards and breaks the monopoly of overseas materials, significantly reducing the manufacturing cost of car lamp components.