Product Overview
WiseSorbPro EHC is a high-performance humidity control valve designed specifically for automotive headlamps. It integrates intelligent moisture management and pressure balance in one compact solution. With its core structure comprising recyclable desiccants, elastic valve, and waterproof breathable component, EHC creates a single, controlled pathway for air exchange within the headlamp. This innovative design effectively prevents fogging and condensation, ensuring optimal lamp clarity and enhancing driving safety.
R&D Background
Automotive headlamps are prone to fogging and condensation, especially in high-humidity environments or during sudden temperature drops. Traditional headlamps rely on waterproof breathable components like vent caps or membranes to equalize internal and external air pressure. However, these components also allow moisture to enter the headlamp, leading to increased internal humidity over time.
Additionally, when exposed to rapid cooling—such as when driving in rain or moving from a warm garage to a cold outdoor environment—the trapped moisture condenses on the lens, impairing visibility and potentially compromising driving safety. To address this issue, WiseSorbPro developed the EHC, which not only balances pressure but also actively manages moisture. Its innovative design ensures that even in extreme conditions, headlamps remain clear and free from condensation.
Product Structure
EHC’s effectiveness comes from its three key components:
— Recyclable Desiccant: Positioned in the air pathway, the desiccant absorbs incoming moisture, keeping the headlamp interior dry. It regenerates itself using the heat generated during lamp operation, releasing absorbed moisture to ensure long-term use.
— Elastic Valve: Located between the desiccant and the waterproof component, this valve opens and closes automatically based on internal and external pressure differences. It allows pressure equalization while preventing uncontrolled moisture ingress.
— Waterproof Breathable Component: Situated on the outermost layer, this component provides excellent water resistance while enabling air to flow freely.
These components work together to create a single controlled air exchange channel. With all other pathways sealed, EHC effectively eliminates fogging and condensation caused by excess moisture inside the headlamp.
Technical principles
Heating Phase
When the headlamp is in use, the temperature inside rises, increasing air pressure. The elastic valve opens, allowing humid air to escape. Simultaneously, the heat regenerates the desiccant, releasing the moisture it has absorbed. This expelled moisture further reduces internal humidity.
Stable Phase
During steady operation or when the headlamp is off, internal and external pressure equalize, and the valve closes. This prevents additional moisture from entering the headlamp, ensuring a prolonged dry state and extending the desiccant’s lifespan.
Cooling Phase
When the headlamp cools down, internal pressure drops, creating a vacuum effect. The valve reopens to allow external air in, but this air is first filtered through the desiccant, which removes any moisture. This prevents condensation from forming even during sudden temperature drops.
Humidity Control Performance
What is Dew Point Temperature?
Dew point temperature refers to the point at which moisture in the air condenses into liquid water. A lower dew point indicates a stronger ability to resist condensation.
Performance Comparison
EHC（Indicating Silica Gel）:
• Lowest dew point: 4.1°C.
• Effectively prevents condensation at temperatures as low as 4.1°C.
EHC（Molecular Sieve）:
• Lowest dew point: 1.2°C.
• Provides exceptional moisture control, especially in extreme environments with high humidity and large temperature fluctuations.
Competitive Product :
• Lowest dew point: 11.4°C.
• Prone to condensation when the temperature drops below 11.4°C, causing moisture to accumulate inside the headlamp.
Key Data Highlights:
• Both EHC variants outperform the competitor, achieving average dew points approximately 10°C lower under identical conditions.
• EHC maintains stable humidity control over time, whereas the competitive product shows declining efficiency, with dew point fluctuations and reduced absorption capability.
Conclusion:
In a 31-day static test, both EHC variants demonstrated superior humidity control. The Indicating Silica Gel EHC maintained a dew point as low as 4.1°C, while the Molecular Sieve EHC achieved an unparalleled 1.2°C. In contrast, the competitive product failed to prevent condensation once the temperature dropped below 11.4°C. These results highlight the EHC’s ability to keep headlamp
interiors dry for extended periods, significantly enhancing visibility and driving safety.
Applications
WiseSorbPro EHC is designed for versatility, making it suitable for all types of automotive headlamps. Its superior performance is especially beneficial in:
• High-humidity regions, such as tropical areas or rainy seasons.
• Cold climates, where sudden drops in temperature can lead to condensation.
• Regions with fluctuating weather, where large temperature and humidity variations are common.
EHC ensures that headlights remain clear and functional in these challenging environments.
Additionally, its recyclable desiccant reduces replacement frequency, supporting eco-friendly and cost-effective practices.
As the automotive industry continues to evolve—driven by the rise of electric and smart vehicles—headlights are expected to perform flawlessly under increasingly complex conditions. WiseSorbPro EHC meets these demands by delivering advanced moisture control, ensuring superior headlamp performance, and enhancing driving safety.
