| HS Code | 180068 |
| Product Name | EVERLAM WHITE |
| Product Type | Self-adhesive cast vinyl film |
| Color | White |
| Finish | Gloss |
| Film Thickness | 50 microns |
| Adhesive | Permanent solvent acrylic |
| Adhesive Thickness | 25 microns |
| Liner | . Silicone-coated release liner |
| Durability | Up to 10 years |
| Application Temperature Range | +10°C to +30°C |
| Service Temperature Range | -40°C to +90°C |
| Gloss Level | 85 ± 5 |
| Opacity | 99% |
| Storage Life | 2 years from date of manufacture |
| Brand | EVERLAM |
| Product Name | EVERLAM WHITE |
| Product Type | PVB interlayer film |
| Material | polyvinyl butyral |
| Color | opaque white |
| Thickness | 0.76 mm |
| Width | 2.0 m |
| Length | 100 m |
| Light Transmittance | opaque |
| Uv Transmittance | <1% |
| Adhesion To Glass | excellent |
| Application | decorative and privacy laminated glass |
| Storage Temperature | 10-25°C |
As an accredited EVERLAM WHITE factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EVERLAM WHITE is supplied as rolls in protective, moisture-resistant cartons, with a quantity of 100 square metres per carton. |
| Container Loading (20′ FCL) | EVERLAM WHITE is packed into a 20-foot FCL container, securely stowed and braced for safe chemical transport. |
| Shipping | EVERLAM WHITE is non-hazardous for transport. It is not regulated as dangerous goods under ADR, IMDG, or IATA, so no UN number or hazard label is required. Ship in standard commercial packaging as a dry solid, protected from moisture and excessive heat. No special transport documentation is needed. |
| Storage | Store EVERLAM WHITE in the original, clearly labeled container with the lid securely closed. Keep it in a cool, dry, well-ventilated area, away from direct sunlight, heat, sparks, and incompatible materials such as strong oxidizers. Maintain the recommended temperature range and avoid moisture ingress. Use secondary containment to prevent spills. Always follow the Safety Data Sheet for specific requirements. |
| Shelf Life | EVERLAM WHITE has a shelf life of 12 months when stored in its original packaging in a cool, dry place. |
EVERLAM WHITE is processed as a white ethylene-vinyl acetate copolymer film for thermal lamination of glass, photovoltaic encapsulant stacks, and flat rigid substrates. The material is supplied in roll form and is not a liquid coating; downstream processing therefore requires either vacuum-bag or diaphragm-press lamination with controlled cooling. Because the white pigmentation is achieved with titanium dioxide dispersion, melt viscosity and crosslink response differ from unpigmented EVA grades. The following application zones reflect separate processing windows and compliance pathways.
In monocrystalline PERC and TOPCon module backside encapsulation, the film is positioned between the rear glass or backsheet and the cell matrix. The cured layer must provide adhesion to solder-coated busbars, optical decoupling, and stable diffuse reflectance after damp-heat exposure. A representative lamination cycle on a semi-automatic vacuum laminator with a silicone membrane is 145 °C platen setpoint for 16 min to 18 min, with vacuum drawn to -0.1 MPa and membrane pressure held at 0.08 MPa to 0.12 MPa. Platen temperature variation exceeding ±3 °C across the bed shifts gel fraction by approximately 2 to 4 percentage points because dicumyl peroxide decomposition is strongly time–temperature dependent. Gel fraction measured by ASTM D2765-16 should remain between 75 % and 90 % for standard c-Si modules; values above 92 % are associated with embrittlement at cell busbar edges. Incoming roll inspection includes melt flow index testing under ISO 1133-1:2022 at 190 °C with 2.16 kg load and differential scanning calorimetry under ISO 11357-2:2020 to verify exotherm onset. Rolls exposed to relative humidity above 60 % for more than 24 h should be pre-dried at 40 °C for 12 h, because absorbed moisture forms bubbles at the glass interface during vacuum release. The laminated module must pass the adhesion and insulation tests of IEC 61730-1:2023 and the damp-heat sequence of IEC 61215-1:2021, which exposes the module to 1000 h at 85 °C and 85 % relative humidity without delamination exceeding 5 % of module area. Terminal products include glass-glass bifacial modules using the white film as a rear scattering layer, and glass-backsheet monofacial modules where the white encapsulant replaces transparent EVA behind the cell string.
In structural laminated glass, white EVA interlayer is assembled between two panes of heat-treated or chemically strengthened glass and consolidated in a vertical vacuum bag. The bag is heated to 135 °C and held for 60 min to 90 min; the pack is then cooled under vacuum to below 50 °C before release. The principal process conflict is the adhesion–creep trade-off: undercured film exhibits shear creep during high-temperature service, while overcured film loses peel strength at the glass–EVA interface. For a TiO₂-filled white grade, the post-lamination gel fraction is typically controlled within 70 % to 85 % by ASTM D2765-16. Differential scanning calorimetry under ISO 11357-2:2020 is used to confirm residual enthalpy; a post-lamination exotherm above 5 J/g indicates incomplete peroxide consumption and requires a repeat cure cycle. Pendulum impact resistance is assessed under EN 12600; a passing laminate retains glass fragments without delamination larger than 10 cm². Moisture ingress at the edge is a known failure mechanism, so edge sealing with silicone or the use of a perimeter spacer is specified for insulating glass units under EN 1279-5. Terminal products include opaque spandrel panels, stair railings, and overhead glazing where the white interlayer provides both safety retention and light diffusion.
| Application segment | Qualification standard | Test condition | Acceptance boundary |
|---|---|---|---|
| Photovoltaic module encapsulation | IEC 61215-1:2021 | Damp heat, 1000 h at 85 °C / 85 % RH | Delamination < 5 % of module area |
| Photovoltaic module safety | IEC 61730-1:2023 | Adhesion and insulation after lamination | No electrical or adhesive failure |
| Architectural laminated glass | EN 12600 | Pendulum impact | Fragment retention; delamination < 10 cm² |
| Insulating glass edge integrity | EN 1279-5 | Edge seal durability | No moisture penetration at edge |
| Interior decorative glass | ISO 12543-3:2021 | Visual and optical defect inspection | No defect exceeding specified optical limits |
Decorative laminated glass panels for interior partitions commonly use the white film as an opaque bonding layer between clear soda-lime float glass and a decorative insert, such as screen-printed PET, woven polyester, or acid-etched glass. The film must flow into the surface texture without displacing the insert. A flat-bed diaphragm laminator applies 0.06 MPa to 0.10 MPa while the stack is held at 125 °C to 135 °C for 45 min. Inserts thicker than 0.5 mm require a pre-tack step at 110 °C for 10 min before the full cure cycle. The white layer provides sufficient opacity to mask substrate mottling and thickness variation. Durability for interior use is evaluated under ISO 12543-4:2021, while fire classification is reported under EN 13501-1. Terminal products include office partition panels, lift lobby glazing, and decorative wall cladding.
Building-integrated photovoltaic spandrel units use the white EVA film to conceal rear circuitry and to reflect transmitted light back toward the cell. The film is laminated in a multi-step vacuum press at 140 °C for 18 min, with rear glass preheated to 60 °C to reduce thermal shock. Because the TiO₂-filled film has higher melt viscosity than clear EVA at the same temperature, platen loading pressure should be increased by 0.02 MPa to 0.04 MPa to avoid edge voids. The cured film must pass partial discharge testing under IEC 61730-1:2023 and thermal cycling under IEC 61215-1:2021 for 200 cycles from -40 °C to 85 °C without cracking. Terminal products include opaque BIPV facade elements and spandrel panels that require compliance with both building cladding and photovoltaic safety standards.
| Process | Equipment type | Temperature | Time | Pressure | Gel fraction control target |
|---|---|---|---|---|---|
| PV module encapsulation | Semi-automatic vacuum laminator, silicone membrane | 145 °C platen | 16–18 min | 0.08–0.12 MPa | 75–90 % |
| Architectural laminated glass | Vertical vacuum bag | 135 °C | 60–90 min | 0.06–0.10 MPa | 70–85 % |
| Decorative glass partition | Flat-bed diaphragm laminator | 125–135 °C | 45 min | 0.06–0.10 MPa | Sufficient flow without insert displacement |
| BIPV spandrel | Multi-step vacuum press | 140 °C | 18 min | Increased 0.02–0.04 MPa above clear EVA setting | 75–90 % |
| Solar thermal collector | Heated platen press | 120 °C | 20 min | 0.08 MPa | Project-specific; insufficient published data |
Flat-plate solar thermal collectors and photovoltaic-thermal hybrid panels can use the white film as an edge seal and back-insulation bonding layer when the fluid absorber temperature does not exceed 85 °C. At sustained temperatures above 95 °C, the EVA matrix loses peel strength and the TiO₂-filled layer can yellow. The lamination process uses a heated platen press at 120 °C for 20 min at 0.08 MPa. Published data for this specific configuration is limited; accelerated aging per ISO 9806 may be required for project qualification. Terminal products include low-temperature flat-plate collector glazing and hybrid collector bonding.
White EVA interlayer is used in low-iron laminated glass for museum display cases where the back pane is opacified. The film is cut slightly oversize and assembled with a UV-absorbing PET interleaf when spectral transmittance below 380 nm must be reduced. Lamination is performed in a silicone vacuum bag at 130 °C for 60 min. The white interlayer must not delaminate after 1000 h of QUV-B exposure; optical qualification uses ASTM D1003 for haze and ASTM E313 for yellowness index. Terminal products include conservation-grade display vitrines and museum storage glazing.
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EVERLAM WHITE is a pigmented polyvinyl butyral sheet supplied for laminated safety-glass constructions in which the interlayer must contribute opacity, diffuse visible reflectance, and controlled edge appearance after autoclave bonding. The product is manufactured from plasticized PVB resin compounded with an inorganic white pigment phase, typically rutile titanium dioxide. It is supplied as roll-stock interlayer for fixed and opening architectural glazing, interior partitions, balustrades, spandrel panels, furniture glass, and decorative safety glazing. The designation is based on nominal thickness and roll format rather than a separate alpha-numeric model code. Standard thicknesses include 0.38 mm, 0.76 mm, 1.14 mm, and 1.52 mm, with roll widths commonly supplied between 1,000 mm and 3,210 mm. Published data for the pigmented white grade are more limited than for clear PVB; consequently, class-level values cited below are drawn from publicly available PVB data, ISO 12543 series documents, and standard laminated-glass processing guidance.
Roll identity is specified by thickness, width, and surface finish. For white interlayers, an embossed or smooth surface is selected according to the lay-up method. Embossed surfaces reduce premature blocking during cold stacking and assist air removal during vacuum pre-press, while smooth surfaces are required for roll-to-roll lamination lines with controlled tension. The inorganic pigment does not create a separate model classification; it is incorporated into the standard PVB melt stream. Fabricators requiring documented optical properties should obtain grade-specific spectral transmittance and reflectance files from the producer, because published data for the white configuration is limited in public documents. Standard component conformity is aligned to ISO 12543-2, with durability testing performed under the methods of ISO 12543-4.
| Parameter | Reference method | Nominal range or value |
|---|---|---|
| Sheet thickness | Geometric measurement | 0.38 mm / 0.76 mm / 1.14 mm / 1.52 mm |
| Roll width | Supplier inspection | 1,000 mm to 3,210 mm |
| Roll length | Supplier inspection | 100 m to 300 m depending on thickness |
| Specific gravity | ISO 1183-1:2019 | 1.07 to 1.10 |
| Moisture content as supplied | ISO 15512:2020 | ≤ 0.35 wt% |
| Tensile strength at break | ISO 527-3:2018 | ≥ 20 MPa |
| Elongation at break | ISO 527-3:2018 | ≥ 200 % |
| Glass transition temperature | Differential scanning calorimetry | 10 °C to 20 °C, class-level PVB range |
The supplied moisture content is a critical incoming-control variable. Because PVB is hygroscopic, the wrapper moisture-barrier integrity, roll-end sealing, and lay-up hall conditions determine whether the sheet retains its specified bonding behaviour. A single specification table cannot capture batch-specific optical properties; therefore, incoming spectral reflectance and colour-coordinate data are recorded against roll lot for laminates intended for high-visibility façade areas.
Before unwrapping, the roll is conditioned in the lay-up hall at 20 °C ± 2 °C for a minimum of 24 h, with ambient relative humidity maintained below 30 % where practical. If storage humidity exceeds 60 %, the wrapper is opened only after the roll temperature is within 3 °C of the lay-up room temperature to avoid surface condensation on the sheet. Karl Fischer moisture content is verified at the outer lap and core lap. Levels above 0.35 wt% require pre-drying at 30 °C to 35 °C in a desiccant dryer with dew point below −20 °C. Rolls returned to storage are re-sealed within 30 min of exposure to uncontrolled atmosphere. Failure to control moisture produces bubble defects at the glass–interlayer interface, particularly at edges where water migration from cut surfaces is fastest.
On a production line, white interlayers are cut oversize to allow 5 mm to 8 mm peripheral trim after de-airing. The glass and interlayer are assembled in a clean room with temperature 20 °C ± 3 °C and relative humidity ≤ 30 %. Two de-airing routes are used. In the vacuum-bag route, the laminate is sealed under a vacuum of 0.85 bar to 0.95 bar absolute, heated to 105 °C to 125 °C, and held until edge seal visibility is confirmed. In the nip-roller route, the assembly is heated to 120 °C to 150 °C, passed through calendering rolls at controlled gap and speed, and cooled briefly before autoclave loading. Autoclave bonding for PVB sheets is typically conducted at 135 °C to 140 °C and 12 bar to 14 bar, with a soak of 30 min to 60 min depending on glass thickness and interlayer stack. The white pigment increases infrared absorption under short-wave heaters; pre-heat power settings may therefore require adjustment on laminated-glass lines originally calibrated for clear PVB. A recorded batch log should include glass tin-side orientation, interlayer moisture content, calendering roll temperature, autoclave pressure, and final edge adhesion test results. Avoid combination with amine-based glass cleaners or residual silicone release compounds; both can depress hydroxyl-mediated adhesion between PVB and glass and produce edge delamination after thermal cycling.
White pigment particles scatter incident visible radiation, reducing direct transmittance and producing a diffused daylight distribution inside occupied spaces. The optical effect is used in privacy glazing where a non-transparent interlayer is required, and in spandrel areas where vision through the panel must be blocked while maintaining a uniform façade colour. PVB inherently absorbs strongly below 380 nm; the white pigment contributes additional multiple scattering in the 420 nm to 700 nm visible band. Product-specific spectral reflectance data for EVERLAM WHITE are not supplied in public datasheets; façades with strict solar-optical requirements should be tested using the actual glass build under EN 410 or ISO 9050 for visible transmittance, solar transmittance, and total solar energy transmittance.
The white pigment phase raises the complex modulus slightly relative to unpigmented PVB at equal plasticizer content, but the effect is typically small enough that the interlayer retains the viscoelastic shear behaviour expected of plasticized PVB under ISO 527-3 tensile loading and ISO 6721 dynamic mechanical analysis. In laminated glass, structural performance is dominated by glass thickness and heat treatment; the interlayer contributes shear transfer and post-fracture adhesion. For a given build, white pigmented PVB does not automatically confer the same pendulum-impact classification as clear PVB, because glass adhesion after autoclave can vary with pigment loading. Classification under EN 12600 is configuration-specific and should be validated by pendulum testing on production samples. Adhesion is measured by the pummel test under ISO 12543-4 or equivalent internal procedures; adjusted adhesion grades for pigmented interlayers may require controlled addition of adhesion-control salts or primer on the glass surface.
Three interlayer types are commonly cross-referenced in architectural lamination. Clear PVB provides high direct visible transmittance, typically 88 % to 91 % for a standard clear laminate, and is selected for vision zones. Translucent coloured PVB preserves partial light transfer with a tinted appearance. EVERLAM WHITE is formulated to shift the interlayer from transparent to diffusing or opaque white; it is therefore closer to a light-scattering optical element than to a clear safety interlayer. The primary differences are optical density, edge appearance after cutting, and sensitivity of the autoclave bond to pigment dispersion. Clear PVB shows a nearly transparent edge line; white PVB shows a uniform white edge that can be integrated into a ceramic-frit or painted spandrel system. Mechanically, both clear and white PVB grades share the same ISO 12543 component-family requirements, but batch-to-batch adhesion and moisture content should be measured separately for white because the pigment influences sheet surface energy and water absorption kinetics.
| Attribute | Clear PVB | EVERLAM WHITE | Translucent coloured PVB |
|---|---|---|---|
| Direct visible transmittance | 88 % to 91 % | Low; opacity controlled by pigment loading | 30 % to 80 % depending on colour |
| Edge appearance after lamination | Nearly transparent | Uniform white | Tinted, colour-dependent |
| Ultraviolet response | Strong absorption below 380 nm | Strong absorption below 380 nm plus visible scattering | Colour-specific spectral variation |
| Autoclave cycle | 135 °C to 140 °C, 12 bar to 14 bar | Same class cycle; possible pre-heat adjustment | Same class cycle; colour-specific verification |
| Adhesion management | Standard adhesion-control salt target | May require modified pummel target | Colour-specific adhesion adjustment |
| Laminate standards | ISO 12543, EN 12600 | ISO 12543, EN 12600, EN 410 | ISO 12543, EN 12600, EN 410 |
EVA encapsulant films differ from PVB in chemistry, storage requirements, and processing. EVA typically requires desiccant-protected ambient storage, vacuum-bag lamination at lower autoclave pressures, and a peroxide-driven crosslinking step, whereas PVB relies on plasticizer-modified adhesion to glass. Direct substitution of white PVB for clear PVB shall not be performed without requalifying the laminate build for light transmittance, colour, pummel adhesion, and impact classification.
Architectural applications for EVERLAM WHITE include laminated glass in interior partitions, doors, railings, back-painted glass, spandrel panels, and privacy screens where opaque white or backlit diffusing interlayers are specified. For backlit panels, LED arrays are positioned behind the laminate and the white interlayer acts as a diffusing sheet; uniformity depends on interlayer thickness, glass distance, and LED pitch. When the panel is used in a façade, the laminated inner pane may be combined with a second glass pane in an insulating-glass unit, and the white interlayer must be evaluated for its effect on IGU cavity temperature and long-term edge-seal durability under EN 1279. Cleaning and maintenance materials should be neutral pH and free of ketones, chlorinated solvents, and ammonia. Fabricators should retain traceability records linking roll lot, moisture readings, autoclave cycle, and pummel adhesion results.
