What’s Changing in Solar Backsheets, and Why One New PET Option Stands Out

If you’ve been on a module line lately, you’ve probably heard the chatter: a good
solar backsheet film
can make or break field reliability. Lucky Ppcw1 Solar Backsheet—made in No. 6, Lekai South Street, Baoding, Hebei, China—leans into that reality with a reinforced PET outer layer and, to be honest, a surprisingly tidy lamination window. Many buyers tell me it feels like the “safe choice” without the fluoropolymer baggage.

Industry trend snapshot

Module powers are up; field stress is up. Buyers want fluorine-free designs to sidestep PFAS concerns, while keeping UV, hydrolysis, and sand abrasion at bay. The Lucky Ppcw1 uses a specially formulated reinforced PET outer layer with precise thickness control—exactly the sort of incremental engineering that, in practice, reduces shrinkage and keeps peel strength stable over years. In fact, several EPCs say PET-based solutions are easier to source and recycle; I guess the circularity conversation is finally real.

How it’s built and tested

• Materials: reinforced PET outer layer; PET core; adhesive/primer inner layer for EVA/POE laminate compatibility.
• Process flow: film extrusion → surface treatment → adhesive coating → drying/curing → roll slitting → incoming QC → lamination trials.
• Key tests: damp heat (85°C/85% RH, 1000–2000 h), UV exposure, thermal cycling, PID-screening (module level), peel strength, WVTR, dielectric breakdown.
• Standards referenced: IEC 61215/61730 protocols; ASTM E96 (WVTR); ASTM D882 (tensile); ISO 4892 (UV). Real-world use may vary.
• Service life: designed for typical 25–30-year module lifetimes when integrated per OEM guidelines.

Product specs (indicative)

Parameter	Lucky Ppcw1 (≈)
Total thickness	300–350 μm (customizable)
Breakdown voltage	> 1.5 kV DC typical
WVTR	≤ 2.0 g/m²·day (23°C, ASTM E96)
Peel strength (EVA)	≥ 40 N/cm after lamination
Thermal shrinkage
Color	White or black; others on request
Lamination window	≈145–155°C, 10–15 min (EVA-based)

Note: Values are typical; line settings, encapsulant, and local conditions affect outcomes.

Applications and advantages

• Use cases: residential rooftops, C&I, utility-scale, agrivoltaics; desert and coastal installs with appropriate BOM pairing.
• Advantages: fluorine-free design option, stable adhesion, controlled thickness, and supply-chain simplicity.

A line operator told me the solar backsheet film “just behaves”—less curl, cleaner cut edges, fewer reworks. That tracks with the reinforced PET outer layer design.

Vendor comparison (quick take)

Vendor	Base structure	Customization	Lead time	Standards support
Lucky Ppcw1	Reinforced PET/PET	Color, thickness, rolls	Around 2–4 weeks	IEC 61215/61730 test support; CoC on request
Vendor A	PET/PA/PET	Limited	3–6 weeks	IEC support; select UL
Vendor B	Co-extruded polyolefin	High	4–8 weeks	IEC/UL; regional marks

Field notes and integration tips

One C&I integrator in Southeast Asia told us modules with this solar backsheet film held peel strength “nicely” after two monsoons—anecdotal, yes, but encouraging. Practical tips: verify EVA/POE compatibility, keep lamination within the suggested window, and log shrinkage after trial runs. Don’t skip salt-mist or ammonia tests if your market demands them (IEC 61701/IEC 62716).

Certification and documentation

Ask for material data sheets, lot CoA, and third-party test reports mapped to IEC 61215/61730. For North America, some buyers prefer UL 61730 at the module level; in Europe, TÜV marks are common. RoHS/REACH statements are table stakes nowadays.

Origin: No. 6, Lekai South Street, Baoding, Hebei, China.

References

1. IEC 61215: Terrestrial PV modules – Design qualification and type approval. https://webstore.iec.ch
2. IEC 61730: PV module safety qualification. https://webstore.iec.ch
3. ASTM E96: Water Vapor Transmission. https://www.astm.org/e0096
4. NREL Backsheet Durability Research (overview). https://www.nrel.gov/pv