Oct . 28, 2026
THE BUYER'S GUIDE / SELECTION
This guide helps procurement teams and module manufacturers evaluate a solar backsheet manufacturer by working through the criteria that matter most before placing an order. Using the Lucky TPP1 solar backsheet as the primary reference product, the article walks through structural composition, electrical insulation requirements, environmental durability benchmarks, process compatibility, and application-specific fit. Buyers evaluating utility-scale, high-voltage, or harsh-environment projects will find a structured checklist for comparing published specifications against their project requirements.
Layer structure and material quality: Assess the weather-resistant layer material (e.g., PVF or PVDF), stated thickness tolerance, UV absorber content, and bonding layer processing method. For the Lucky TPP1, the PVF outer layer is controlled within 125 ± 5 μm and the PO bonding layer is produced by three-layer co-extrusion.
Electrical insulation and voltage class: Verify partial discharge voltage, volume resistivity, and explicit system voltage certification. The TPP1 specifies volume resistivity > 1 × 10¹⁶ Ω·cm, partial discharge at 15 kV, and full certification for 1500 V systems.
Environmental durability: Match the manufacturer's damp heat aging hours, UV aging resistance (kWh/m²), thermal cycling range and count, and chemical resistance to the project's climate and environment. The TPP1 covers UV aging > 150 kWh/m², 3,000-hour damp heat stability, 200 thermal cycles from −40 °C to 85 °C, and resistance to acids, alkalis, solvents, and salt spray.
Process compatibility: Confirm peel strength (N/cm), yellowing index, and lamination bubble area specifications, and whether these are tested per batch. The TPP1 documents peel strength > 60 N/cm and yellowing index ΔYI ≤ 6.
Quality control and traceability: Assess whether the manufacturer performs batch-by-batch raw material inspection, 100% finished product performance inspection, accelerated aging sampling, and maintains complete quality traceability records — all of which are stated for the TPP1.
Application scope fit: Confirm whether the manufacturer's application categories match the project type (e.g., 1500 V utility-scale, harsh environment, double-glass modules).
When procurement teams search for a solar backsheet manufacturer, they are rarely buying a commodity. The backsheet is the outermost protective layer on the rear of a PV module, and its material composition, layer structure, and performance thresholds directly affect module longevity, voltage rating, and maintenance cost over a 25-year or longer field life. Choosing the wrong backsheet — or the wrong manufacturer — can compromise an entire project.
The Lucky TPP1 solar backsheet supplied by Baoding Lekai International Ltd.
Before comparing individual products, buyers should agree on which criteria are non-negotiable for their project. The following categories are the most commonly decisive.
A backsheet's protective performance depends on the composition and precision of each layer. For fluoropolymer-based backsheets, the weather-resistant outer layer is the primary defence against UV radiation, moisture, and mechanical stress.
For the Lucky TPP1, the weather-resistant layer uses a high-quality PVF (polyvinyl fluoride) fluoropolymer film with thickness precisely controlled within a 125 ± 5 μm range. The layer incorporates high-efficiency UV absorbers and stabilizers, and its surface is specially treated to enhance interface bonding. The bonding layer uses a self-developed PO film manufactured by three-layer co-extrusion to achieve a uniform, dense structure. This co-extrusion process supports a melting point ≥ 160 °C for high-temperature stability and provides reflectivity ≥ 85%, which contributes to improved module power generation efficiency.
Buyer checkpoint: Confirm the weather-resistant layer material (PVF, PVDF, or fluorinated coating), the thickness tolerance.
For utility-scale and 1500 V system projects, electrical insulation performance is a hard requirement. Partial discharge voltage and volume resistivity are the most critical published figures.
The TPP1 specification states:
These figures indicate suitability for high-voltage PV installations. Buyers specifying 1500 V system architectures — now common in utility-scale ground mounts — should verify that any candidate backsheet explicitly addresses this voltage class.
Buyer checkpoint: Request the partial discharge voltage and volume resistivity. The TPP1 has been tested and certified under IEC 62788-2.
A backsheet's rated durability must match the climate and operating environment of the project site. Damp heat resistance, UV aging resistance, and thermal cycling range are the most universally relevant benchmarks.
For the TPP1:
For projects in coastal areas, desert regions with high UV irradiation, or locations subject to industrial pollution, these figures provide a verifiable baseline. Projects in harsh environments should also consider whether the product has documented salt spray resistance, which the TPP1 explicitly covers.
Buyer checkpoint: Match the manufacturer's aging test hours and conditions against the climate zone of your project. A coastal installation in a high-humidity region has different durability requirements than an inland desert plant.
Backsheet compatibility with the lamination process and encapsulant (typically EVA) affects production yield and field reliability. Key indicators are peel strength, yellowing index, and lamination bubble area.
The TPP1 specification documents:
A peel strength value above 60 N/cm reduces the risk of delamination during lamination or over the module's service life. A low yellowing index confirms that the backsheet will not discolour in a way that affects module aesthetics or inspections.
Buyer checkpoint: Confirm peel strength values and whether the manufacturer tests lamination bubble area batch by batch or only at qualification.
A rigorous quality system is a manufacturer-level criterion, not a product-level one, but it can be assessed through published process documentation. For the TPP1, the stated quality control system includes:
This level of batch-by-batch inspection and traceability documentation is a relevant differentiator for buyers in markets where field failures carry significant warranty or replacement cost.
Buyer checkpoint: Ask whether 100 % finished product inspection and complete traceability records are standard, or available only for specific order volumes.
The Lucky TPP1 solar backsheet is suitable for the following application categories:
Buyers whose projects fall outside these categories — for example, projects requiring a transparent backsheet for bifacial modules, or applications where end-of-life recyclability is a procurement requirement — should evaluate whether the TPP1 is the appropriate match, or whether a different product from the same manufacturer better fits those constraints.
This guide is limited to confirmed product information and does not substitute for an engineering specification review. The TPP1 specification does not document:
Buyers with specific requirements in these areas should request documentation directly from Baoding Lekai International Ltd. before making a sourcing decision.
Use this checklist when assessing a candidate solar backsheet manufacturer against the criteria above:
| Criterion | What to Verify |
|---|---|
| Layer structure | Fluoropolymer type, thickness tolerance, bonding layer process |
| Voltage compatibility | Partial discharge voltage, volume resistivity, system voltage certification |
| Durability benchmarks | Damp heat hours, UV aging kWh/m², thermal cycle count and range |
| Process compatibility | Peel strength (N/cm), yellowing index, lamination bubble area |
| Quality system | Batch-by-batch inspection, traceability records, IEC testing |
| Application fit | Confirmed application categories from manufacturer documentation |
Matching each row against your project specification — before requesting a sample or quotation — reduces the risk of selecting a product that passes qualification testing but underperforms in the target environment.
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The Evolution of Lucky Group: A Legacy of Innovation and Global Reach On December 24, 1953, the 199th Administrative Meeting of the Government Affairs Council of the Central People's Government passed the *Resolution on Establishing a National Film Distribution Network and Film Industry*, mandating the construction of a film stock manufacturing facility in China. This landmark decision laid the foundation for what would become a cornerstone of China's imaging and materials science sector.…
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