Industries · Solar
Crosslinkable EVA encapsulation films, backsheet adhesive layers, and complementary high-temperature engineering plastics for the global photovoltaic module and balance-of-system supply chain. Reference overview for procurement and application engineers.
Industry Overview
A reference overview of polymer materials used in crystalline silicon photovoltaic modules and adjacent balance-of-system components.
In crystalline silicon PV modules, ethylene-vinyl acetate (EVA) is the most widely used encapsulant. Crosslinkable EVA films are laminated between the front glass, the cells, and the backsheet, providing optical coupling, mechanical cushioning, and electrical insulation. The vinyl acetate (VA) content of solar-grade EVA is typically controlled in the 28–33% range, which balances flexibility, adhesion, and crosslink density under lamination conditions.
The choice of EVA grade affects lamination cycle time, crosslink density, and long-term module performance under accelerated aging tests such as IEC 61215 damp-heat and UV exposure. Most high-volume module manufacturers use either conventional fast-cure EVA grades or high-clarity UV-cut grades for double-glass bifacial modules.
Beyond EVA encapsulation, the broader solar supply chain also uses PA66, PPA, and PPS for junction box housings, backsheet inner layers, and solar-tracker structural components. EVOH occasionally appears in transparent high-barrier backsheet constructions. For inverter housings, flame-retardant PA66 and EMC-grade PPS are common in commercial-scale systems.
Jinsutong supplies the full EVA encapsulation grade portfolio alongside complementary engineering plastics (PPS, PA66, PPA) used across the solar value chain. Our business team can advise on grade selection based on lamination process parameters, end-application (single-glass vs. double-glass, bifacial, building-integrated PV), and regional regulatory requirements.
Recommended Grades
A selection of commonly traded EVA encapsulation grades and adjacent engineering plastics used in PV module and BOS applications. Full grade library is available in our EVA grade reference.
| Grade | Manufacturer | VA Content | MFI (g/10min) | Typical Use in Solar |
|---|---|---|---|---|
| Escorene™ Ultra LD 700Internal snapshot · original TDS on request | ExxonMobil | 13% | 7 | General-purpose packaging / lower-VA lamination |
| Escorene™ Ultra UL 15019Internal snapshot · original TDS on request | ExxonMobil | 19% | 150 | High-flow adhesive / backsheet tie layer |
| Elvax® 150 | DuPont | 32% | 43 | High-VA foam / hot-melt adhesive |
| Elvax® 240 | DuPont | 28% | 38 | Foam, extrusion coating, encapsulation |
| Lupolen® EVA 28400 | LyondellBasell | — | — | Solar encapsulation film (dedicated grade) |
| Lupolen® EVA 28200 | LyondellBasell | 28% | 20 | Solar encapsulation film (dedicated grade) |
| EVA HP-2835 | Hanwha Solutions | 28% | 15 | Solar encapsulation film (fast-cure) |
| EVA 光伏胶膜级 | 盛虹斯尔邦 (Sierbang) | 28% | — | Solar encapsulation film (domestic alternative) [国产替代 · 库存待询] |
For PPS, PA66, PPA and other engineering grades used in solar junction boxes, inverters, and tracker components, see the full grade reference.
Typical Applications
Reference application overview covering module encapsulation, backsheet construction, junction box components, and balance-of-system hardware.
Crosslinkable EVA films (typical VA 28–33%, MFI 15–30 g/10min) are laminated between the front glass, the cells, and the backsheet or rear glass, providing optical coupling, mechanical cushioning, and electrical insulation. The grade selection depends on lamination cycle time and the desired crosslink density.
High-clarity, UV-transmitting EVA grades (or POE alternatives) are used in bifacial modules where the rear side also receives light. Optical clarity, UV stability, and PID-resistance are the key selection criteria for rear-side encapsulants in bifacial and building-integrated PV (BIPV) modules.
Lower-VA EVA grades (15–25%) and EAA-based tie layers are used in junction box potting compounds and as inner adhesive layers in multilayer backsheet constructions, where they bond PET, fluoropolymer (PVDF / PVF), and aluminum layers for long-term weatherability.
PA66 GF30 / GF35 and PPA grades are widely used for solar-tracker bearings, drive housings, torque-tube supports, and connector bodies that require weatherability, UV resistance, and long-term fatigue performance under outdoor installation and wind loading.
Why Choose Jinsutong
Five core product lines, full VA range coverage, and Shanghai-based logistics — built to serve module and BOS manufacturers.
From low-VA adhesive grades to high-VA crosslinkable solar films, we cover the VA spectrum used in PV encapsulation and adjacent applications. Consolidate your EVA sourcing with a single Shanghai-based supplier.
Beyond EVA, our portfolio includes EAA (multilayer adhesion for backsheets), EMAA, EVOH (transparent high-barrier backsheet options), and PPS (high-heat junction-box and inverter components) — enabling consolidated sourcing for solar module and BOS manufacturers.
We list Hanwha HP-2835, Lupolen EVA 28400 / 28200, and domestic Sierbang EVA among our stocked solar encapsulation grades, providing both global brands and domestic alternatives for qualification flexibility.
Module producers and component suppliers in China can rely on our Fengxian-based shipping and customs support for both import and export flows. Quick access to Shanghai ports, bonded warehouses, and global shipping lanes.
Reach our Business Manager Mr. Mo Hailong directly via phone, email, or QQ for solar-grade quotation, sample coordination, and qualification support — no call-center layers, no waiting.
Get in Touch
For solar encapsulation, backsheet, or BOS component polymers, our business team is ready to support your qualification and procurement planning.
Case Studies
Fictional but realistic application scenarios based on industry trends and publicly available data. Customer and project names are illustrative only — confirm specific project details with our business manager.
A leading Tier-1 module manufacturer transitioned its TOPCon product line from single-EVA to a dual-EVA/POE stack in 2024. The change required lamination temperature adjustment from 145 °C to 155 °C and reformulation of the crosslinker package. After 12 months of field exposure, PID-related degradation was reduced from 3% to < 0.5% per year, justifying the 25% cost premium for the POE layer.
A distributed solar installer standardized on 28% VA crosslinkable EVA films for all single-glass monofacial modules in 2023. The single-grade sourcing strategy reduced inventory complexity by 40% and procurement lead time by 2 weeks compared to the previous three-grade system. Field performance over 24 months matched the previous multi-grade approach within 0.2% efficiency degradation.
A bifacial module manufacturer adopted Hanwha EVA HP-2835 (28% VA, 35 MI, UV-cut) for the front-side encapsulation of dual-glass modules. The UV-cut formulation reduces UV transmission to the cells by 60% compared to standard EVA, extending module life in high-UV environments by an estimated 3-5 years based on accelerated aging tests.
Decision Tree
Use this decision tree as a starting point for solar encapsulant selection. Cell technology is the primary driver; module architecture and lamination line compatibility refine the choice.
⚠️ Reference decision tree. For project-specific grade selection, contact our business manager Mr. Mo Hailong at +86 138 1603 7020.