| HS Code | 728013 |
| Brand | KENGO |
| Product Name | KENGO Colour EVA Film |
| Material | Ethylene Vinyl Acetate (EVA) |
| Product Type | Colored EVA interlayer film |
| Colour Options | Red, yellow, blue, green, grey, black, white, purple, and custom colours |
| Thickness | 0.38 mm, 0.76 mm |
| Width | 1000 mm to 2500 mm |
| Length | 100 m per roll or customized |
| Density | 0.95 ± 0.02 g/cm³ |
| Melting Point | 65 °C to 75 °C |
| Light Transmittance | ≥90% for clear type; varies by colour and thickness |
| Adhesion Strength | ≥50 N/cm |
| Tensile Strength | ≥20 MPa |
| Elongation At Break | ≥500% |
| Thermal Shrinkage | ≤3% |
| Uv Resistance | Good |
| Weather Resistance | Good |
| Application | Laminated glass, decorative glass, architectural glass |
| Storage Conditions | Cool, dry, ventilated place; avoid direct sunlight |
| Shelf Life | 12 months |
As an accredited KENGO Colour EVA Film factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
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KENGO Colour EVA Film is specified as a pigmented ethylene-vinyl acetate interlayer for laminated glass manufactured by vacuum-bag or flatbed lamination; it is not positioned as an autoclave PVB replacement where structural shear transfer is the primary design function. The downstream scope is limited to six application segments in which colour stability, fragment retention and edge moisture resistance are the controlling specification attributes. Incoming film lots are checked for melt flow consistency under ISO 1133-1:2022 and tensile elongation under ISO 527-3 before production trials; regulatory assessments for the coloured interlayer include RoHS Directive 2011/65/EU limits for lead, mercury, cadmium and hexavalent chromium. Open-film staging is controlled to below 50% RH; exposure above 60% RH requires conditioning at 40 °C for at least 4 h before layup, because absorbed moisture contributes to edge microvoiding during the peroxide cure stage.
In overhead and sloped glazing assemblies, the interlayer must retain glass fragments after fracture under combined snow load, thermal expansion and impact. Products in this segment are qualified to ISO 12543-2:2021 for laminated safety glass and impact-tested under EN 12600:2002 or CPSC 16 CFR 1201 Categories I and II as applicable; heat-soaked toughened glass conforming to EN 14179 is used to reduce nickel sulfide fracture risk. The standard layup places one 0.76 mm colour EVA film between two 6 mm thermally toughened glass panes, giving a nominal interlayer thickness fraction of 6.0%; for 8 mm + 8 mm or 10 mm + 10 mm builds, two plies of 0.38 mm are used to obtain the same final interlayer thickness while allowing edge trim without diagonal film pull. Lamination is performed in a flatbed vacuum-bag laminator at platen setpoints of 135 °C to 150 °C, with a vacuum depression of not less than 0.08 MPa relative to atmospheric pressure and soak times of 60–90 min depending on glass mass and edge distance. Because the pigmented EVA layer absorbs radiant heat differently from clear grades, platen temperature uniformity should be maintained within ±3 °C across the full glass area to prevent centre overcuring and edge undercuring. Terminal finished glass types in this segment include atrium canopies, skylight lites, sloped façade units, overhead walkway panels and interior structural transoms.
The substitution alters edge stability, cleaning-agent compatibility and door-slam deflection behaviour. Interior partition and door glazing in this segment is supplied to ANSI Z97.1-2015 Class A or CPSC 16 CFR 1201 Category I as required by local building code; the laminated glass is not a fire-rated assembly, so door locations subject to EN 13501-2 or equivalent fire-glazing requirements must receive a separate product approval. The standard layup uses a 0.38 mm colour EVA film between 3 mm + 3 mm or 4 mm + 4 mm clear or ultra-clear glass, producing a nominal interlayer thickness fraction of 5.9% for the 6 mm build and 4.5% for the 8 mm build. Flatbed vacuum lamination is run at 140 °C to 145 °C with soak times from 45 min for the 6 mm total build to 75 min for the 8 mm total build; tack rolling before vacuum is avoided for sub-0.38 mm films because edge wrinkles can be locked into the laminate during final cure. Terminal part types include cut-to-size partition panels, swing door lites, sidelites, vision panels and internal office glazing modules.
Because framed interior balustrades and low-stress guard infill panels receive repeated line loads at the handrail and localised impact near the edge channels, the pigmented EVA interlayer is limited to configurations in which the glass is continuously captured on all four edges and the primary structural load is carried by the metal frame rather than the interlayer. Compliance for this segment is evaluated under CPSC 16 CFR 1201 Category II and AS/NZS 2208:1996 where applicable; the local impact class must be confirmed by pendulum or bag impact testing according to the governing building code. The standard film-to-glass build is 6 mm + 6 mm or 8 mm + 8 mm toughened glass with one 0.38 mm colour EVA film, corresponding to a nominal interlayer thickness fraction of 3.1% for the 12 mm build and 2.3% for the 16 mm build. Processing is carried out at 145 °C for 75–100 min in a vacuum-bag laminator, and after cooling the exposed edge is protected by a U-channel or polyurethane edge gasket to prevent moisture ingress. Point-fixed dry glazing should not be specified for pigmented EVA laminates in structurally open balustrades because published long-term creep data for concentrated point loads in this configuration are limited. Finished product types include interior glass balustrades, mezzanine guard infill panels, stair-rail glass and low-level retail barriers.
| Application segment | Governing standard or regulation | Test condition / acceptance reference | Operational boundary |
|---|---|---|---|
| Overhead and sloped glazing | ISO 12543-2:2021; EN 12600:2002; CPSC 16 CFR 1201 | Pendulum impact; fragment retention after fracture; heat-soak to EN 14179 | Platen uniformity ±3 °C; vacuum depression >0.08 MPa |
| Interior partition doors | ANSI Z97.1-2015; CPSC 16 CFR 1201 | Class A or Category I impact | Not fire-rated; no 0.25 mm film for door lites |
| Framed balustrades and guards | CPSC 16 CFR 1201; AS/NZS 2208:1996 | Local building code impact class | Continuous four-edge capture only; no point-fixed dry glazing |
| Spandrel and shadow-box panels | ASTM C1172-19; ISO 12543-4:2021 | ASTM E903-20 solar absorptance; diurnal thermal cycling | Colour stability verified on production mock-up |
| Furniture and display cases | ANSI Z97.1-2015; EN 12600:2002 | Fragment retention for moveable glass | Cooling ramp <3 °C/min after cure |
| Wet-area glazing | EN 14428:2015; EN 12600:2002 | Impact and humid ageing | Exposed cut edge must be enclosed or sealed |
Spandrel glass using opaque coloured EVA film replaces ceramic frit in clip-and-cassette façade systems because the interlayer carries the obscuration layer between two glass plies and remains protected from exterior cleaning agents and sealant migration. The relevant product standard is ASTM C1172-19 for laminated architectural flat glass, and durability is assessed under ISO 12543-4:2021; thermal stress is predicted from solar absorptance measurements made according to ASTM E903-20. For shadow-box units, a single 0.38 mm opaque film is laminated between 6 mm heat-strengthened glass and 5–6 mm coated or clear inner glass, giving a nominal interlayer thickness fraction of 3.0–3.4%; when the film is the only obscuration layer and night-time backlighting must be blocked, thickness is increased to 0.76 mm to prevent pinhole light transmission. Vacuum lamination uses a staged oven profile: ramp at 2 °C/min to 135 °C, hold for 30 min to equilibrate glass mass, then increase to 145 °C for a 40 min final cure soak. A platinum resistance temperature sensor at the glass perimeter, rather than oven air temperature, is used to terminate the soak because the IR absorption of dark pigments produces a measurable centre-to-edge surface-temperature offset. Multi-year exterior weathering data for specific pigment masterbatches in this build are limited; façade project specifications should therefore require a project-specific UV-humidity cycling programme. Finished glass types include spandrel lites, shadow-box panels, semi-opaque façade infill panels and ventilated rain-screen glass.
For furniture, display-case and hospital joinery applications, lamination is constrained by the thermal mass of thin glass substrates and by the requirement for fragment retention without edge sealants. The accepted safety benchmark is ANSI Z97.1-2015 Class A or EN 12600:2002 pendulum impact classification appropriate to the drop height. The lowest practical build is 3 mm + 3 mm glass with a 0.38 mm colour EVA film, corresponding to a nominal interlayer thickness fraction of 5.9%; 0.25 mm film is used only for decorative cabinet panels where no safety-glazing classification is required. The process uses a flatbed vacuum-bag press at 135 °C for 50–70 min, and the cooling stage is controlled to less than 3 °C/min to avoid optical distortion at the centre of dark-pigmented films. Terminal products include glass table tops, display-case fronts, museum case panels, reinforced shelving and hospital cabinetry glazing.
Shower enclosures, spa partitions and indoor pool surrounds expose the laminate to continuous high humidity, detergent films and thermal shock from hot water. Compliance is usually declared to EN 14428:2015 for shower enclosures and to EN 12600:2002 for impact performance; because the EVA interlayer has lower moisture equilibrium than standard plasticized PVB in humid field installations, edge buttering is omitted only when the cut edge is fully enclosed by a U-channel. The layup uses a 0.38 mm film between two 6 mm toughened glass panes, giving a nominal interlayer thickness fraction of 3.1%; 0.76 mm interlayers are reserved for spa partitions above 900 mm in height. Vacuum lamination is carried out at 145–150 °C with a soak of 60–75 min, followed by dimensional stabilisation at 25 °C and 50% RH for 24 h before edge trimming. Finished component types include shower screens, bathroom partition panels, steam room glazing and glass doors in humid environments.
| Glass build | Film thickness | Interlayer thickness fraction | Platen setpoint | Soak time |
|---|---|---|---|---|
| 3 mm + 3 mm | 0.38 mm | 5.9% | 140–145 °C | 45–60 min |
| 4 mm + 4 mm | 0.38 mm | 4.5% | 140–145 °C | 60–75 min |
| 6 mm + 6 mm | 0.38 mm | 3.1% | 145–150 °C | 60–75 min |
| 6 mm + 6 mm | 0.76 mm | 6.0% | 135–150 °C | 75–100 min |
| 8 mm + 8 mm | 0.76 mm | 4.5% | 140–150 °C | 90–120 min |
| 10 mm + 10 mm | 0.76 mm | 3.7% | 140–150 °C | 100–130 min |
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KENGO Colour EVA Film is supplied in the CF-EVA series as a pigmented ethylene-vinyl acetate interlayer, with nominal thicknesses of 0.38 mm, 0.45 mm, 0.50 mm, and 0.60 mm and width formats up to 2.4 m. The copolymer matrix contains 28 wt% vinyl acetate and exhibits a melt flow rate of 25 g/10 min to 35 g/10 min when measured under ISO 1133-1:2022 at 190 °C and 2.16 kg. Base polymer density is 0.95 g/cm³ per ISO 1183-1:2019. Colouration is introduced through pre-compounded pigment masterbatch dispersion in the melt phase, not by post-extrusion coating, so the colourant resides within the interlayer matrix rather than at the glass-film interface.
Processing is commonly performed on single-chamber vacuum laminators, three-chamber vacuum bag lines, or heated nip-roll systems for architectural decorative glass, safety-glass interlayers, textile-embedded panels, and photovoltaic encapsulation where a colour-modified transmittance profile is required. In contrast to PVB sheet, KENGO Colour EVA Film does not require an autoclave; typical lamination profiles use 145 °C to 150 °C platen temperature, vacuum of −0.095 MPa to −0.098 MPa, a vacuum hold of 8 min to 12 min, and a cure hold of 20 min to 25 min.
The peroxide cure package activates above 135 °C, and the degree of crosslinking is determined by the time-at-temperature profile rather than by pressure alone. Gel fraction measured by xylene extraction in accordance with ASTM D2765-16 typically reaches 82 % to 88 % after a 150 °C cure hold of 20 min. Differential scanning calorimetry under ISO 11357-2:2020 shows the main cure exotherm between 140 °C and 160 °C. If platen surface temperature exceeds 165 °C, acetic acid evolution from residual vinyl acetate increases sharply, and the pigmented phase becomes more susceptible to colour shift. On production laminators with platen temperature spread greater than ±3 °C, edge-region under-cure and centre-region yellowing have been observed. A closed-loop platen heating control with ±1 °C to ±2 °C uniformity is therefore required for dark-pigmented films, where absorbance of infrared radiation can raise the local film temperature above the set point.
Adhesion of KENGO Colour EVA Film to float glass and polycarbonate is achieved without primer when surfaces are cleaned to a contact angle below 40 ° using deionised water. Peel adhesion to float glass tested in 180° geometry according to GB/T 2790-1995 is typically 45 N/25 mm to 65 N/25 mm, while adhesion to polycarbonate is typically 35 N/25 mm to 50 N/25 mm. PVB requires an autoclave at 1.2 MPa and 135 °C to reach full wetting, and its adhesion to polycarbonate and metal-edge inserts is lower without specialised primers. Pigmented EVA also bonds to brushed stainless steel and aluminium mesh without an added tie layer; published data for long-term humidity exposure on untreated metal substrates is limited.
| Property | Test method | KENGO Colour EVA | Clear EVA | PVB | TPU |
|---|---|---|---|---|---|
| Tensile strength | ASTM D638-14 | 18 MPa | 20 MPa | 22 MPa | 35 MPa |
| Elongation at break | ASTM D638-14 | 450 % | 600 % | 250 % | 500 % |
| Shore A hardness | ASTM D2240-15 | 80 | 75 | 70 | 85 |
| Melt flow rate | ISO 1133-1:2022 | 25–35 g/10 min | 30–40 g/10 min | not normally reported | 15–25 g/10 min |
| Visible light transmittance | ASTM D1003-21 | colour-dependent, 15–75 % | 90 % | 88 % | 90 % |
The lower tensile strength and hardness relative to TPU indicate that pigmented EVA should not be specified where edge-stiffness or ballistic penetration resistance is the controlling design criterion. Compared with clear EVA, the pigmented grade trades some luminous transmittance for colouration and therefore requires photometric verification against ASTM D1003-21 or ISO 13468-1:2019 on the finished laminate, not on raw film.
EVA interlayers are viscoelastic at room temperature. Under sustained stress of 0.1 MPa at 40 °C, creep strain in pigmented EVA is typically lower than clear EVA because mineral pigment particles restrict segmental flow, but the trade-off is a reduction in elongation at break to 450 % compared with 600 % for unpigmented EVA. Plasticiser migration from adjacent PVC or plastisol seals into the EVA film is possible if a plasticiser bath is present; the pigmented surface does not act as a barrier. For laminates bonded to plasticised PVC gaskets, a barrier layer of polycarbonate or metallised PET is required. Published data for specific plasticiser-to-pigment interaction under long-term thermal ageing is limited.
Raw film should be stored in intact vapour-barrier packaging at 10 °C to 30 °C and below 60 % RH. In humid coastal production environments where ambient RH exceeds 60 %, pre-drying at 60 °C for 4 h to 6 h in a desiccant dryer with a dew point below −30 °C is recommended before lamination. Moisture absorption in EVA is low relative to PVB, but entrapped moisture at the glass-film interface produces edge bubbles and reduces peel adhesion under thermal cycling. If film remains exposed at 25 °C and 70 % RH for longer than 8 h, the lamination cycle should be extended by 2 min at the cure hold or the film should be re-dried. Bi-metallic or aluminium-frame laminates require particular attention because condenser surfaces can localise water at edges.
In photovoltaic encapsulation, the pigmented film is typically processed in a laminator at 150 °C for 18 min to 22 min, followed by a 160 °C post-lamination cure if gel fraction remains below 80 %. Because the colourant absorbs part of the solar spectrum, the short-circuit current of the module is lower than an equivalent clear-EVA module; cell-to-module power loss should be determined on the finished module under IEC 60904-1:2020 and IEC 61215-2:2021, not inferred from film transmittance alone. For decorative building-integrated photovoltaic panels, the film is supplied with a matte surface on one side to reduce specular reflection; published data for long-term colour retention in high-UV environments is limited.
Edge clouding in pigmented EVA is primarily caused by either moisture or insufficient vacuum during the initial hold. If edge clouding appears within 20 mm of the glass perimeter, vacuum pressure should be checked at the pump inlet rather than the gauge, because line losses can reduce actual vacuum by 0.005 MPa to 0.010 MPa. Bubble-free laminates of 2.4 m × 1.2 m glass require vacuum pump capacity of at least 40 m³/h per chamber. Interlayer fold marks in nip-roll lines are corrected by preheating film to 50 °C and controlling unwind tension below 10 N. These process limits are derived from production-scale equipment behaviour rather than laboratory film coupons.
Incompatible additive classes include primary or secondary amine-based adhesion promoters, which can abstract acetic acid during lamination and shift the crosslink density unpredictably. Sulphur-cured rubber gaskets and lead-containing glass coatings should be avoided because metal ions can degrade the EVA interlayer at the edge. Maximum continuous service temperature for laminated glass produced with KENGO Colour EVA Film should not exceed 80 °C in structural applications; at 100 °C, creep deflection increases rapidly and the laminate may lose post-glass-breakage retention. UV stabilisation is formulated into the pigmented masterbatch, but long-term outdoor exposure should be verified under ISO 4892-2:2013 or ASTM G155-21 accelerated weathering rather than extrapolated from indoor data.
| Compliance area | Standard or regulation | Status or condition |
|---|---|---|
| Restricted substances | 2011/65/EU (RoHS) | Passes for lead, cadmium, mercury, and hexavalent chromium |
| Base resin food contact | 21 CFR 177.1520 | Applicable to unpigmented base polymer; pigmented grade requires end-use migration testing |
| Weathering reference | ISO 4892-2:2013 | Accelerated exposure cycling; colour shift limits to be agreed per laminate construction |
| Flammability | ISO 3795 / FMVSS 302 | Film burn rate evaluated on finished laminate; not rated as fire barrier |
Batch-to-batch variation is controlled by melt flow rate and ash content. Incoming film is sampled per lot and tested for melt flow rate under ISO 1133-1:2022, tensile properties under ASTM D638-14, and gel fraction after a standard cure cycle under ASTM D2765-16. Pigment loading is monitored by ash content at 600 °C and by transmission spectrophotometry across 380 nm to 1100 nm. On a twin-screw extrusion line with L/D ratio 40:1 and vacuum venting at −0.08 MPa, pigment agglomerates greater than 20 μm are filtered through a screen pack, and the extrudate is calendered to thickness tolerance ±0.02 mm. These controls reduce optical mottling and cross-lamination thickness variation in finished panels.
