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    Lamination Type Backsheet—KPC/KPK

    Product Series

     Models

    Structure 

    Thickness

     Color

    BEC 303

     

    PVDF/Adhesive/PET/F-coating

    290μm

    White/Black

    PVDF/Adhesive/PET/F-coating

    290μm

    High Reflectivity Black

    BEC-303

     

    PVDF/Adhesive/PET/F-coating

    305μm

    White/Black

    PVDF/Adhesive/PET/F-coating

    305μm

    High Reflectivity Black

    BEF-302

    PVDF/Adhesive/PET/Adhesive/PVDF

    320μm

    White



    Introduction

    Firstbacksheet?  BEC-303 has a structure of the PET film sandwiched by PVDF film and Fluorine polymer. BEC-303 has excellent weather-resistance properties, the EVA side provides high reflectivity and strong adhesion, the air side undergoes long-term aging test, which can ensure the safety and stability of  modules.

    Firstbacksheet?  BEF-302 is designed as multi-layer structure. Hydrolysis resistant PET acts as middle substrate,  and both sides are laminated with PVDF films by automation precision process. The adhesion between PET and PVDF is high and stable, no delamination at long-term field exposure. 


    Basic Property

    Properties

    Method

    Units

    BEC 303

    BEC-303

    BEF-302

    Peel strength to EVA

    GB/T 2790

    N/10mm

    >60

    >60

    >60

    Thermal shrinkage

    ASTMD2305

    %

    < 0.5%/0.25%

    < 0.5%/0.25%

    < 0.5%/0.25%

    Tensile strength at break

    GB.T 13542.2

    MPa

    >100

    >100

    >100

    Elongation at break

    GB.T 13542.2

    %

    >100%

    >100%

    >100%

    WVTR

    ASTM F1249

    g/m2.24h

    <2.0

    <2.0

    <2.0

    CTI

    IEC 60112

    V

    >600

    >600

    >600

    Partial discharge

    IEC 60664-1

    VDC

    >1000

    >1500

    >1500

    Breakdown voltage

    GB.T 1408

    kV

    >17

    >20

    >20

    Reflectivity white

    400-1100nm

    ASTM E1164

    %

    75%

    75%

    75%

    Reflectivity  HR black

    800-1100nm

    ASTM E1164

    %

    50%

    50%

    50%

    Application scenarios

    .

    .

    1000VDC system

    UL1703 type 1 / 1500VDC system

    UL1703 type 1 /

    1500VDC system



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