Solar EVA & POE Films: The Essential Encapsulation Materials
Comprehensive Guide to Photovoltaic Encapsulation Technologies
Understanding Solar Encapsulation Films
Solar encapsulation films are critical materials in photovoltaic module manufacturing, serving as protective layers that enhance efficiency and extend the lifespan of solar panels.
The Role of Encapsulation Films in Solar Modules
Photovoltaic encapsulation films are specialized materials used in solar panel manufacturing to protect and enhance the performance of photovoltaic cells. These essential components:
✓ Provide critical protection against environmental factors like moisture, UV radiation, and mechanical stress
✓ Enhance light transmission to maximize energy conversion efficiency
✓ Ensure long-term durability with lifespans exceeding 25 years
✓ Maintain electrical insulation and prevent potential-induced degradation (PID)
As a factory with expertise since 2013, Foshan Ruihong Industry & Trade Co., Ltd understands that quality encapsulation materials are fundamental to solar panel performance. The global market has transformed significantly since 2008 when foreign companies dominated the sector. Today, Chinese manufacturers lead with superior products.
Types of Solar Encapsulation Films
Modern photovoltaic modules utilize four primary encapsulation film types, each with distinct characteristics and applications:
Transparent EVA Films
Market Dominant Solution
- Excellent light transmission (91%+)
- Superior adhesion properties
- Enhanced yellowing resistance
- Cost-effective manufacturing
- Ideal for standard PV modules
White EVA Films
Reflective Efficiency Boost
- Contains titanium dioxide additives
- Reflects light back to solar cells
- Increases power output by 1-10W
- Specifically for backsheet applications
- Improves aesthetics of modules
POE Films
Premium Protection
- Superior resistance to PID
- Exceptional moisture barrier
- Enhanced durability in harsh climates
- Ideal for double-glass modules
- Higher cost, premium performance
EPE Composite Films
Innovative Hybrid Solution
- EVA-POE-EVA layered structure
- Combines best properties of both
- Excellent processability + PID resistance
- Perfect for PERC and N-type cells
- Optimal for demanding environments
Manufacturing Excellence: EVA Production Methods
EVA resin production primarily uses high-pressure continuous bulk polymerization. Two principal methods dominate the industry:
Tubular Reactor Process
• Higher single-pass conversion (25-35%)
• Larger production capacity (200-300kt/year)
• Excellent optical properties
• Lower operating costs
• Ideal for VA content below 30%
Autoclave Reactor Process
• Better for specialty formulations
• Can handle higher VA content (up to 40%)
• Produces unique copolymer varieties
• Smaller production lines (100-140kt/year)
• Higher manufacturing costs
At Foshan Ruihong, we leverage both production methods to create optimized encapsulation films for different applications. Our technical expertise ensures consistent quality across all product lines.
Custom Encapsulation Solutions
Need specialized films for your photovoltaic modules? Our engineering team develops custom formulations to meet specific performance requirements and environmental conditions.
Request Custom SolutionMaterial Evolution & Technical Advancements
The solar encapsulation industry has undergone remarkable transformation. Pre-2008, encapsulation films suffered from numerous technical challenges:
• Excessive shrinkage rates
• Insufficient aging resistance
• Rapid yellowing issues
• Inconsistent thickness distribution
• Complex curing requirements
Through continuous R&D investment, manufacturers have overcome these limitations. Modern EVA films demonstrate:
• 30% better UV resistance
• 50% reduction in curing time
• Improved thickness uniformity (±3%)
• Enhanced thermal stability
• Extended service life guarantees
These advancements directly contribute to reducing LCOE (Levelized Cost of Energy) while increasing module lifespan.