Special Functional Type Backsheet—Transparent/1500V High Voltage
Product Series
| Model | Structure | Thinckness | Color |
| BEF-402 | PO/F-coating/PET/F-coating | 200μm/5μm/250μm/15μm | White /Black |
| BEC-301T | F-coating/PET/F-coating | 15μm/250μm/15μm | Transparent |
Introduction
Firstbacksheet® BEF-402 is a backsheet with more than 1500VDC partial discharge, which consist of PO layer, hydrolysis resistant PET layer and two fluorine coating layers. BEF-402 has excellent insulation and moisture barrier property, which can meet the application requirement of high voltage PV modules.
Firstbacksheet® BEC-301T is transparent designed as tri-layer structure, which not only has high light transmittance and low haze, but also has excellent insulation performance and long term weather durability property. BEC-301T can be used in building and double power modules with the advantage in lightweight and lamination condition.
Basic Property
| Property | Quoted Standard | Unit | BEF-402 | BEF-402B | BEC-301T |
| Color | / | / | White | Black | Transparent |
| Peeling Strength with EVA | GB/T 2790-1995 | N/10mm | >100 | >100 | >100 |
| Water Vapor Transmission Rate | ASTM F1249-2006 | g/m2.24h | <1.5 | <1.5 | <1.5 |
| Comparative Tracking Index | IEC 60112-2009 | V | >600 | >600 | ≥400 |
| Partial Discharge （in air） | IEC 60664-1 | VDC | >1600 | >1600 | >1000 |
| Transmittance(400-700nm) | GB/T 29848-2013 | % | <5.0 | <5.0 | >85 |
| Haze(400-700nm) | GB/T 29848-2013 | % | / | / | <25 |
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