Re-yingcai® Superhydrophilic Self-Cleaning Nano Coating for PV Modules is a PV-specific protective coating independently developed by Dongguan Yingcai New Material. Based on an inorganic hydrophilic nanosilica system, it forms a highly transparent superhydrophilic film after application. Rainwater spreads evenly across the glass as a continuous water film, automatically washing away dust, alkaline deposits and sand while preventing water marks and mud spots. The coating does not reduce light transmission and also provides acid, alkali and corrosion resistance. It significantly reduces PV cleaning frequency and solar-plant O&M costs, and is suitable for original PV glass, refurbishment of operating solar plants and factory-applied protection for new modules.
Product Features
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SuperhydrophilicityWater contact angle ≤8°; rainwater spreads across the full surface to wash away dust.
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Light Transmittance GainImproves PV glass light transmission by 1%–2.5% to support stable power output.
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Weather ResistanceProvides up to 5 years of outdoor durability without yellowing or loss of hydrophilic performance.
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Dust Resistance & Less CleaningExtends cleaning intervals by 3–6 times, significantly reducing manual cleaning costs.
Product Parameters
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Product Model YCB01004H Solid Content 10±1% pH Value 6.0–8.0 Curing Conditions Air-dry for 20 minutes at room temperature; fully cure for 24 hours Water Contact Angle <10° (superhydrophilic grade) Change in Light Transmittance ≤+0.4%, with a slight transmittance-enhancing effect Shelf Life in Original Packaging 6 months when sealed and stored in a cool, dark place
Superhydrophilic Self-Cleaning with Rain-Assisted Washing
With a surface water contact angle below 3°, the coating forms a continuous, uniform water film instead of droplets. Under gravity, rainwater rapidly spreads and penetrates the interface between contaminants and glass, generating strong capillary washing action. Without manual intervention, this mechanism efficiently lifts inorganic dust and particles for rain-assisted self-cleaning. Compared with conventional hydrophobic coatings that remove only part of the dirt, this technology improves the removal rate of large-area contamination to over 90%, helping maintain stable light transmission.
Enhanced Transmittance and Reduced Reflection for Higher PV Conversion
In addition to self-cleaning performance, the coating provides excellent optical transmittance enhancement. Its nanoporous structure reduces reflection from the glass surface and increases light transmission, allowing more sunlight to reach the solar cells. Test data show that coated modules can generate more electricity than untreated modules, delivering the dual benefits of cleaner glass and improved PV efficiency.
Dust and Contaminant Resistance with Long-Term Durability
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The coating combines hydrophilic dust-removal behavior with excellent chemical stability and weather resistance. It helps neutralize static electricity, reduces dust adhesion and forms a dense protective layer on the glass to resist acid rain, bird droppings and organic contaminants. Strong bonding to the glass substrate and high wear resistance allow the coating to retain its self-cleaning performance for years after a single application.
Hot-Spot Mitigation and Auxiliary Surface Cooling
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Rapid, uniform water-film spreading and evaporation remove heat from the module surface through the latent heat of water, providing auxiliary cooling. Uniform evaporation also reduces temperature differences caused by localized contamination such as bird droppings, helping lower the risk of hot spots. A lower module operating temperature protects solar cells, supports longer module life and improves the operational safety of PV plants.
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