Product Introduction
EVA (Ethylene Vinyl Acetate) encapsulant film is the cornerstone material in photovoltaic module manufacturing, serving as a high-performance thermoplastic adhesive that transforms from a solid, non-tacky film at room temperature into a permanent bonding agent during the lamination process. This sophisticated material acts as both a transparent protective layer and a structural adhesive, engineered to safeguard solar cells for over 25 years while maintaining optimal light transmission.
Ooitech, as a leading provider of solar panel production line equipment and materials, offers comprehensive encapsulant film solutions including traditional EVA, advanced POE (Polyolefin Elastomer), and innovative EPE (co-extruded EVA-POE-EVA) films. These materials are specifically designed to work seamlessly with our complete range of production equipment, from solar cell tabber stringers to laminators, ensuring perfect integration in your manufacturing process.
The encapsulant film performs multiple critical functions: providing robust adhesion between glass, cells, and backsheet; offering physical protection against mechanical stress; maintaining high optical transmittance for maximum energy conversion; ensuring electrical insulation for safety; and creating an environmental barrier against moisture and contaminants. Whether you're producing G1, M6, M10, or M12 modules, or working with advanced cell technologies like PERC, TOPCon, HJT, or ABC/HPBC, selecting the right encapsulant is crucial for module performance and longevity.
Technical Specifications
EVA Film Specifications
| Parameter | Standard Value | Premium Grade | Test Method |
|---|
| Light Transmittance | >91% | >92% | ASTM D1003 |
| Gel Content (after curing) | 75-85% | 80-90% | ASTM D2765 |
| Peel Strength to Glass | >80 N/cm | >100 N/cm | ISO 11339 |
| Peel Strength to Backsheet | >60 N/cm | >80 N/cm | ISO 11339 |
| Volume Resistivity | >10¹⁴ Ω·cm | >10¹⁵ Ω·cm | ASTM D257 |
| Water Vapor Transmission Rate | 30-40 g/m²/day | 25-35 g/m²/day | ASTM F1249 |
| UV Cut-off Wavelength | 360 nm | 380 nm | UV-Vis Spectroscopy |
| Operating Temperature | -40°C to +85°C | -40°C to +90°C | IEC 61215 |
| Thickness Options | 0.45mm, 0.50mm | 0.45mm, 0.50mm, 0.60mm | Micrometer |
| Sheet Width | 980-2000mm | Customizable | - |
POE Film Specifications
| Parameter | Standard Value | Premium Grade | Test Method |
|---|
| Light Transmittance | >91% | >92% | ASTM D1003 |
| Water Vapor Transmission Rate | <5 g/m²/day | <3 g/m²/day | ASTM F1249 |
| Volume Resistivity | >10¹⁵ Ω·cm | >10¹⁶ Ω·cm | ASTM D257 |
| Peel Strength to Glass | >100 N/cm | >120 N/cm | ISO 11339 |
| Anti-PID Performance | Excellent | Superior | IEC TS 62804 |
| Processing Temperature | 145-155°C | 145-155°C | DSC Analysis |
| Acid-free Composition | Yes | Yes | Chemical Analysis |
| Thickness Options | 0.45mm, 0.50mm | 0.45mm, 0.50mm, 0.60mm | Micrometer |
EPE Film Specifications
| Parameter | Standard Value | Premium Grade | Test Method |
|---|
| Structure | EVA-POE-EVA | EVA-POE-EVA | Cross-section Analysis |
| Light Transmittance | >91% | >92% | ASTM D1003 |
| Water Vapor Transmission Rate | 8-15 g/m²/day | 5-10 g/m²/day | ASTM F1249 |
| Peel Strength to Glass | >90 N/cm | >110 N/cm | ISO 11339 |
| Anti-PID Performance | Very Good | Excellent | IEC TS 62804 |
| Cost-Performance Ratio | Excellent | Excellent | Market Analysis |
| Processing Window | Wide | Wide | Process Validation |
Technical Advantages
Superior Optical Performance
Maximum Light Transmission: All our encapsulant films achieve >91% light transmittance, with premium grades exceeding 92%, ensuring minimal power loss from optical absorption
UV Stability: Advanced UV stabilizers prevent yellowing and maintain transparency throughout the 25+ year module lifetime
Refractive Index Matching: Optimized refractive index minimizes reflection losses at material interfaces
Enhanced Durability & Reliability
Weather Resistance: Exceptional performance in damp heat (85°C/85% RH), thermal cycling (-40°C to +85°C), and humidity freeze tests
Anti-PID Technology: POE and EPE films provide superior resistance to Potential Induced Degradation, critical for large-scale installations
Chemical Stability: POE films eliminate acetic acid generation, protecting sensitive n-type cells and metallization
Optimized Processing Characteristics
Wide Processing Window: EPE films combine EVA's easy processing with POE's superior properties
Fast Cure Kinetics: Reduced lamination cycle times increase production throughput
Excellent Adhesion: Strong bonding to glass, cells, and various backsheet materials without primers
Compatibility with Advanced Technologies
N-type Cell Compatible: POE and EPE films ideal for TOPCon, HJT, and IBC technologies
Bifacial Module Support: Low WVTR prevents moisture ingress from both sides
Shingled Cell Design: Excellent gap-filling properties for shingled module architectures
Compatible with Ooitech Equipment: Optimized for use with our laminators, EL testers, and complete production lines
Product Applications
Module Type Applications
Crystalline Silicon Modules
PERC modules: EVA remains the cost-effective standard for p-type PERC cells
TOPCon modules: POE or EPE recommended for enhanced reliability with n-type cells
HJT modules: POE essential due to temperature sensitivity and anti-PID requirements
IBC/ABC/HPBC modules: Premium POE for maximum efficiency preservation
Specialized Module Designs
Bifacial modules: POE or EPE for superior moisture resistance on both surfaces
Shingled modules: Materials with excellent flow properties for complete encapsulation
Flexible modules: Special formulations for mechanical flexibility
Building-integrated PV (BIPV): Aesthetic grades with enhanced clarity
Production Line Integration
Pre-Lamination Equipment Compatibility
Solar cell tabber stringers: Material handling considerations for automated layup
Layup stations: Film cutting and positioning systems optimized for different thicknesses
Bussing machines: Compatible with various interconnection technologies
Lamination Process Integration
Works seamlessly with Ooitech laminators for optimal cure profiles
Compatible with both single and double-chamber lamination systems
Supports fast-cure formulations for increased throughput
Quality Control Applications
EL testing: Transparent to electroluminescence wavelengths for defect detection
IV testing: Maintains electrical properties for accurate power measurements
Sun simulator testing: Stable under high-intensity illumination
Industry Sector Applications
Utility-Scale Solar Farms
Anti-PID films for large string voltages
Enhanced durability for 25-30 year warranties
Cost-optimized solutions for GW-scale production
Commercial & Industrial Rooftops
High-efficiency encapsulants for space-constrained installations
Fire-resistant grades for building codes compliance
Long-term reliability for investment protection
Residential Solar Systems
Aesthetic considerations with clear, non-yellowing materials
Enhanced safety features for roof-mounted systems
Compatible with module-level power electronics
Contact for Purchase
Get Expert Consultation from Ooitech
As your comprehensive solar panel production line partner, Ooitech provides not just encapsulant films but complete manufacturing solutions. Our expertise spans from 5MW to 1GW production capacities, covering all aspects of module manufacturing including materials, equipment, training, and after-sales service.
Why Choose Ooitech for Your Encapsulant Needs:
Integrated supply of production equipment and materials
Technical expertise in G1, M6, M10, M12 module formats
Support for all cell technologies: PERC, TOPCon, HJT, IBC, ABC, HPBC
Comprehensive training on material handling and process optimization
Global delivery and local technical support
Download Our Resources:
Contact Our Technical Sales Team:
Email: [email protected] Phone: +86 18571646990 WhatsApp: +86 15961592660 Head Office: Wuhan Yangtze River Center, Wuhan, China Website: www.ooitech.com
Request a Quote Today!Whether you need EVA, POE, or EPE encapsulant films, or a complete solar panel production line solution, our team is ready to provide tailored recommendations based on your specific production requirements. Contact us for:
Material samples and technical datasheets
Compatibility analysis with your current equipment
Process optimization consultation
Bulk pricing and delivery schedules
Complete production line packages
Subscribe to our YouTube channel @ooitech and stay updated with the latest solar manufacturing technologies and best practices!
