lamination type backsheet—kpc/kpk
product series
| model | structure | thinckness | color |
| bec-303 | f-coating/pet/adhesive/pvdf | 15μm/250μm/15μm | white |
| bef-302 | pvdf/adhesive/pet/adhesive/pvdf | 15μm/250μm/15μm | 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
| property | quoted standard | unit | bec-303 | bef-302 |
| color | / | / | white | white |
| peeling strength with eva | gb/t 2790-1995 | n/10mm | >100 | >100 |
| peeling strength at layers | gb/t 8808-1988 | n/15mm | >5.0 | >5.0 |
| water vapor transmission rate | astm f1249-2006 | g/m2.24h | <2.0 | <2.0 |
| shrinkage（150℃*30min , md/td） | gb/t 13542.2-2009 | % | <0.5/0.3 | <0.3/0.3 |
