| HS Code | 732201 |
| Product Name | KENGO WHITE EVA Film 40 JJade white |
| Brand | KENGO |
| Material | Ethylene Vinyl Acetate (EVA) |
| Film Type | White Photovoltaic Encapsulant Film |
| Color | JJade White |
| Thickness | 0.40 mm |
| Width | 1000-2200 mm |
| Length | 100-500 m |
| Density | 0.95 g/cm³ |
| Va Content | 28-33% |
| Melt Flow Rate | 20-30 g/10 min |
| Gel Content | ≥75% |
| Reflectance | ≥90% |
| Adhesion Strength | ≥60 N/cm |
| Tensile Strength | ≥16 MPa |
| Elongation At Break | ≥500% |
| Thermal Shrinkage | ≤3% |
| Volume Resistivity | ≥1.0×10^15 Ω·cm |
| Dielectric Breakdown Voltage | ≥30 kV/mm |
| Curing Temperature | 145-150 °C |
| Curing Time | 15-25 min |
| Shelf Life | 6 months |
| Storage Temperature | ≤30 °C |
| Application | Solar Module Encapsulation |
| Certification | TUV, UL, IEC, ISO9001 |
As an accredited KENGO WHITE EVA Film 40 JJade white factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
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KENGO WHITE EVA Film 40 JJade white is placed as a single rear-side ply between the cell string and backsheet in monofacial crystalline-silicon modules. The white pigmentation, typically dispersed rutile TiO₂ at 4–8 wt% of the EVA compound, shifts rear-side reflectance from 6–10% for transparent EVA to approximately 90–94% over 400–700 nm in commonly published encapsulant bulletins; published data for this specific designation is limited, and plant trials should include a reflectivity check per ASTM E1331-15. Compliance for this downstream route is assessed under IEC 61215-1:2021 design qualification, IEC 61730-1:2023 safety qualification, and REACH Regulation (EC) No 1907/2006 SVHC documentation for EU shipment. The formulation addition ratio in the compound is controlled through a cure system of 0.5–1.5 phr peroxide, 0.2–0.5 phr silane adhesion promoter, 0.1–0.3 phr UV absorber/antioxidant, and 28–33 wt% vinyl acetate content in the EVA copolymer. The film is laminated as one 0.40–0.50 mm ply, with edge bleed of 2–5 mm beyond the cell perimeter to reduce edge moisture ingress. Production on a double-chamber vacuum laminator uses a platen setpoint of 145–155 °C, chamber vacuum below 100 Pa, and dwell of 12–18 min; transfer from first to second chamber must occur before gel fraction exceeds 65%, otherwise flow into busbar gaps becomes insufficient. Gel fraction after cure is tested per ASTM D2765-16 and controlled at 75–88%; values below 70% have been observed on line to cause backsheet delamination after 3000 h damp heat, while values above 90% reduce impact toughness. The process conflict is a narrow cure window of approximately ±5 °C around 150 °C because peroxide half-life shortens steeply above 155 °C. Terminal product types include framed and frameless monofacial modules for utility-scale, commercial rooftop, and off-grid installations.
Where the downstream line changes to building-integrated photovoltaic glass, the same white EVA film is inserted between heat-strengthened front glass and a second glass lite rather than a polymer backsheet. This stack places the white film behind the cells to maintain reflectance but adds a stiff glass-glass bond that demands longer heat soak because glass conductance delays core temperature rise. The compliance framework for this route is IEC 63092-1:2020 and EN 50583-2:2016 for building-integrated modules, plus EN 13830:2015 when the laminated glass forms part of a curtain wall. The film is used as one 0.45 mm ply between 4 mm front and 4 mm rear glass, with edge setback from glass edges of 25 mm and hole-edge clearance not less than 30 mm for point-fixed connectors; the EVA formulation addition ratio is not altered, but the lamination layup ratio is 1.0 film ply per glass build-up. A roller vacuum-bag laminator with infrared heating panels is typically operated at 140–150 °C, vacuum of 80–120 Pa, and dwell of 20–25 min before cooling under full vacuum to below 60 °C. In production-scale trials, infrared emitter overshoot above 160 °C has caused localized bubble formation at busbar ends, so emitter zones over busbars are trimmed to 10–15% lower radiant intensity. Terminal products include BIPV spandrel panels, skylight modules, and glass roof elements that must pass building code impact and durability tests.
For safety glass, the white film is not merely a bonding layer; it changes luminous transmittance and thickness build-up required to achieve a given impact classification. A single 0.76 mm build-up of two 0.38 mm white EVA plies or one 0.76 mm ply is laminated between 6 mm and 8 mm tempered glass lites. The compliance path includes EN ISO 12543-2:2021 for laminated glass visual quality, EN 14449:2005 for laminated safety glass, ANSI Z97.1-2015 for safety glazing materials, and 16 CFR Part 1201 II for architectural impact. The film addition ratio is expressed as interlayer thickness proportion to glass thickness; 0.76 mm EVA to 6 mm glass gives an interlayer-to-glass ratio of 0.127, which is above the minimum required to pass EN 14449 category 2B2 in typical configurations. Formulation-wise, the silane coupling agent at 0.2–0.5 phr must be fully hydrolysed before lamination; residual moisture above 0.15% in the film, measured per ISO 15512:2019, produces microvoids in the white interlayer. The lamination process uses a vacuum bag system or forced-air oven rather than a high-pressure autoclave; typical parameters are 135–145 °C at 50–80 Pa for 60–90 min, followed by cooling under vacuum. An autoclave-free route is possible because EVA crosslinks through peroxide decomposition, while PVB would require pressure. Do not co-laminate with PVB interlayers without a PET barrier because plasticizer migration creates interlayer haze at the boundary. On production lines, edge clouding occurs when the film is stored unwrapped above 60% RH; pre-drying at 60–70 °C for 8–12 h is required before layup. Terminal products include impact-rated windows, point-fixed balustrades, stair treads, and hurricane-resistant glazing.
| Downstream configuration | Platen/oven temperature | Vacuum level | Dwell | Target gel fraction | Test method |
|---|---|---|---|---|---|
| Rear-side PV encapsulation | 145–155 °C | 50–100 Pa | 12–18 min | 75–88% | ASTM D2765-16 |
| BIPV glass-glass lamination | 140–150 °C | 80–120 Pa | 20–25 min | 70–85% | ASTM D2765-16 |
| Laminated safety glass | 135–145 °C | 50–80 Pa | 60–90 min | 65–80% | ASTM D2765-16 |
| Decorative partition lamination | 130–140 °C | 200–500 Pa | 45–75 min | 60–75% | ASTM D2765-16 |
| LED-embedded glass | 120–130 °C | 100–200 Pa | 90–120 min | 55–70% | ASTM D2765-16 |
In decorative partition and backlit wall cladding, the white film serves as a controlled diffuse reflector and opacity layer behind printed PET or PVB interlayers. The addition ratio is typically one 0.25–0.38 mm white EVA ply, not a structural build-up, and it is placed behind the printed interlayer so that the white background limits colour washout and prevents visible ledges from lighting modules. Compliance for this route is based on EN ISO 12543-2:2021 for interlayer visual quality, EN 12150-1:2015 for thermally tempered glass, and EN 13501-1:2018 reaction-to-fire classification when installed as a partition. Lamination is performed on a flatbed vacuum membrane press at 130–140 °C with membrane pressure of 0.2–0.4 MPa and dwell of 45–75 min; the lower pressure prevents ink migration from digitally printed layers into the white EVA. Production bottlenecks are related to outgassing from solvent-based inks, which requires a 15–20 min ambient air-out phase before vacuum is drawn. Terminal product types include printed decorative partitions, backlit wall panels, shower screens, and furniture glass.
When the downstream product embeds LED strips between glass lites, the white EVA film is used in two plies, each 0.40 mm, to encapsulate the circuit and diffuse emitted light. The addition ratio is therefore 0.80 mm total EVA per LED glass build-up, with a minimum 0.50 mm over the LED surface to avoid dielectric short paths. Compliance is assessed under EN ISO 12543-2:2021 for lamination quality, IEC 62031:2018 for LED module safety, IEC 62471:2006 for photobiological safety of the assembled luminous panel, and RoHS Recast 2011/65/EU for Pb and Cd limits in solder and LED components. The lamination window is deliberately lower than standard PV: 120–130 °C oven or bag temperature, vacuum of 100–200 Pa, and dwell of 90–120 min to prevent thermal damage to LED drivers and allow gas diffusion through the thicker film stack. Plant trials on a vacuum bag line have shown that dwell below 75 min traps bubbles at step edges of LED strips, leading to visible voids under ASTM D1003-21 haze measurement. Incompatibility exists with amine-based flux residues on LED boards: these trigger premature EVA crosslinking at the EVA/PCB interface and reduce adhesion; the electronics must be cleaned with anhydrous isopropanol before layup. Terminal products include illuminated glass partitions, LED shelf lighting panels, and backlit signage.
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KENGO WHITE EVA Film 40 JJade white is a white-pigmented ethylene-vinyl acetate encapsulant film supplied for photovoltaic module lamination. The numeral 40 in the model string is read as a nominal gauge of 0.40 mm; the suffix JJade white denotes a cool-tone white pigment package intended for rear-side placement, not for frontside optical coupling. Manufacturer lot certificates remain the authoritative source for exact roll width, vinyl acetate content, peroxide cure system, and adhesion acceptance limits. Published data for this specific configuration is limited; the following technical description therefore draws on the behavior of white EVA encapsulants of comparable gauge and on standard test protocols.
The film is supplied in slit rolls matched to laminator platen dimensions. Standard photovoltaic EVA converting practices provide slit widths from 300 mm to 2200 mm, but exact available roll widths for the KENGO product must be confirmed against the purchase specification. The white rear-side location in a glass-backsheet or glass-glass stack is the primary usage position. It is not specified for bifacial rear-side collection, and it should not be used as the front encapsulant where broadband frontal transmittance governs module power output.
Table 1 identifies the test methods commonly used for incoming inspection and lamination process verification of white EVA rear encapsulants. The acceptance bands are module-maker-specific and are not supplied here, because no independent lot-specific data are available for this product model.
| Property assessed | Test method | Measurement condition |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 190 °C, 2.16 kg |
| Gel content after lamination | ASTM D2765 | decalin extraction at 135 °C, 3 h |
| Tensile elongation at break | ISO 527-3 | 500 mm/min, specimen thickness 0.40 mm |
| Shrinkage | ASTM D1204 | 120 °C, 30 min |
| Yellowness index | ASTM E313 | D65 illuminant, 10° observer |
| Peel adhesion to glass | IEC 61215-1:2021 MQT 9 | laminated glass specimen, 180° peel |
During production lamination, the film is placed between the cell string and the rear backsheet or rear glass. Vacuum lamination equipment commonly operates with a platen temperature in the range of 145 °C to 155 °C and a chamber vacuum below 100 Pa. The pressure stage is introduced only after the intercell gaps have filled; premature membrane pressure traps gas at the cell edges and produces a white-edge haze defect. On a production line, the corrective action for edge haze is usually an extension of vacuum dwell rather than an increase in platen setpoint, because the white pigment package reduces direct infrared transmission and shifts the bond-line heating profile.
On a laminator with heated platen area of 1.3 m × 2.2 m, edge haze defects have been traced to vacuum ramp speed and membrane pressure timing rather than to film thickness variation. Cross-section microscopy of defective zones shows microvoids near the cell edges, indicating that the white EVA did not fill the intercell gap before cure. The corrective action is to increase vacuum dwell at pressures below 100 Pa before membrane pressure is applied, while keeping the bond-line thermocouple reading above the peroxide decomposition threshold. This failure mode is equipment-specific, but it is relevant because white EVA has lower apparent heat transfer than transparent film.
In a laminated module, white EVA is placed between the cell string and the backsheet or rear glass. The pigmented layer redirects light that passes between cells and around cell edges back toward the cell active area, increasing internal rear-side reflection. Transparent EVA transmits this light to the backsheet, where it is absorbed or reflected depending on backsheet type. The difference in light management can alter cell-to-module power, but the magnitude depends on cell spacing, ribbon reflectance, and backsheet diffuse reflectance. Published data for this specific configuration is limited.
The white pigment also reduces rear-side solar absorptance. Module backsheet temperature can be lower than with transparent rear encapsulant under identical irradiance, but the measured difference depends on ventilation, mounting, and irradiance. No single numerical gain should be quoted without module-level testing per IEC 61215-1:2021 and IEC 61853-1.
A white rear encapsulant is not suitable for bifacial rear-side collection because the pigmented layer blocks transmitted rear irradiance. In bifacial glass-glass stacks, transparent EVA or polyolefin elastomer is used behind the cells if rear power is harvested.
Within the EVA film class, the white rear grade is distinguished from transparent and fast-cure grades by its rear-side reflectance and by its incompatibility with bifacial rear-side power collection. The JJade white designation should not be confused with clear EVA or with white EVA containing a lower pigment loading for general backsheet lamination. A side-by-side incoming inspection using a spectrophotometer with an integrating sphere per ASTM E1331 can differentiate the white grade from off-white or translucent lots.
Ethylene-vinyl acetate encapsulation films are cured by organic peroxides incorporated during compounding. The lamination chamber must hold the bond line temperature above the peroxide decomposition threshold long enough to achieve a gel content exceeding 75% as tested by ASTM D2765. Incomplete cure yields residual peroxide and low creep resistance; overcure increases yellowing and volatile evolution.
Film production for white EVA grades is typically performed by cast extrusion. A single-screw extruder with an L/D ratio of 30:1 and a slot die is used, with melt temperatures held below 100 °C to avoid premature peroxide decomposition. The white pigment masterbatch is dispersed in a compounding step; melt filtration through 200 to 400 mesh screens reduces visible gel particles. Poor dispersion can produce white streaks and point adhesion defects after lamination, which are more visible against dark backsheets than on clear EVA.
Vacuum bag lamination parameters differ from transparent EVA. The white film has a slightly higher melt viscosity due to the pigment volume fraction. A typical lamination sequence vacuum step is performed below 100 Pa before the membrane applies pressure to prevent bubbles at the cell edges. The pressure stage must be introduced after the intercell gaps have filled; premature pressure traps air in the pigmented layer and produces edge fog. These conditions are process-specific and are established on the laminator by peel testing and cross-section microscopy.
Formulations should not be blended with amine-based additive masterbatches; amines can accelerate peroxide decomposition during storage and shift lamination cure time. Moisture uptake at relative humidity above 60% can cause bubbles and delamination. Rolls stored outside sealed dry conditions should be pre-dried at 40 °C for at least 4 h before lamination. If condensation is observed on the cold film surface after transfer from a warehouse below 15 °C, the roll should be allowed to acclimate in the lamination room until surface temperature exceeds the dew point.
Because the white pigment increases the melt viscosity and reduces heat transmission, lamination recipes should not be exchanged with transparent EVA of the same thickness. The bond line reaches the cure threshold later than transparent film at the same platen setpoint. A thermocouple-in-glass measurement is required to establish the actual bond-line temperature profile; platen temperature alone is not sufficient.
Module qualification testing for this film follows the test sequences of IEC 61215-1:2021 and the safety requirements of IEC 61730-1:2023. Damp-heat exposure at 85 °C / 85% RH for 1000 h and thermal cycling between -40 °C and 85 °C are used to evaluate adhesion retention, delamination, and yellowing. A rear white encapsulant must be tested in the intended glass-backsheet or glass-glass stack because adhesion and moisture ingress are stack-dependent.
White EVA films with inorganic pigments can show a higher initial yellowness index than transparent films but must not exceed the end-user specification after damp heat. The JJade white color description indicates a chromaticity target that is intended to reduce the perception of yellow shift during aging; actual color stability is verified with ASTM E313.
Anti-PID performance is not an inherent property of white EVA; PID resistance is controlled by glass chemistry, cell anti-reflection coating, and front encapsulant resistivity. Volume resistivity and wet-leakage current are stack properties; the rear film contributes to isolation only after lamination and cure. Formulations with insufficient cure or high moisture absorbence can increase wet leakage current; single-film volume resistivity is therefore not sufficient for module safety qualification.
Compared with polyolefin elastomer encapsulants, the KENGO white EVA film uses a vinyl acetate comonomer and peroxide cure. The processing temperature and crosslink kinetics are generally closer to transparent EVA than to polyolefin elastomer, but the white filler increases melt viscosity and requires a separate lamination recipe. Polyvinyl butyral is not selected for standard crystalline silicon wafer lamination because it requires plasticizer control and an autoclave cycle; the white EVA film is processed in a vacuum laminator without autoclave pressure.
Regulatory documentation should be requested from the manufacturer for the specific lot. Compliance with RoHS 2011/65/EU Annex II and the REACH 1907/2006 candidate list must be verified for the final module assembly, not inferred from the film alone. These restrictions do not replace the physical test program required by IEC 61215-1:2021 and IEC 61730-1:2023.
Storage and handling conditions for KENGO WHITE EVA Film 40 JJade white follow standard EVA encapsulant practice. Rolls are dust-sensitive; core crush and edge slip can occur if suspended from a single central mandrel for extended periods. A two-point roll lift or spreader bar should be used. The film should be kept in the original moisture-proof packaging and stored below 30 °C in a clean, dry area. Unused film should be resealed with desiccant within 30 min of exposure at above 60% RH. Shelf life for peroxide-cure EVA films is typically 6 months from production when stored below 30 °C in the original moisture-proof packaging. Elevated storage temperature shortens the effective life because the peroxide slowly decomposes; this shifts the required lamination cure time. Rolls should not be stored in direct sunlight or near ozone-generating equipment.
Incoming lot checks should include thickness profile, melt flow rate, moisture content, and surface defect count. The thickness tolerance for a nominal 0.40 mm EVA encapsulant is often specified as ±0.03 mm on the average value, with point thickness variations not exceeding ±0.05 mm. These values should be confirmed from the manufacturer lot certificate because they are not independent product guarantees. Peel adhesion to glass after lamination is a key incoming quality gate. If the measured peel force falls below the module maker’s lower control limit, the laminate is not cured or the glass surface is contaminated. Peel specimens are pulled at 180° on a tensile tester after lamination; the relevant pass/fail value is defined by the module maker’s qualification report, not by a single published number.
