| HS Code | 425734 |
| Product Name | EVERLAM CLEARVIEW |
| Film Type | Clear safety and security window film |
| Nominal Thickness | 4 mil (100 microns) |
| Visible Light Transmission | 88% |
| Ultraviolet Light Rejection | 99% |
| Infrared Heat Rejection | 15% |
| Tensile Strength | 20,000 psi |
| Elongation At Break | 150% |
| Adhesion To Glass | 3,000 g/in width |
| Impact Rating | Meets ANSI Z97.1 and CPSC 16 CFR 1201 safety glazing standards |
| Warranty | 10-year residential and commercial limited warranty |
As an accredited EVERLAM CLEARVIEW factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EVERLAM CLEARVIEW is packaged in a 1 L high-density polyethylene bottle with a tamper-evident cap and safety label. |
| Container Loading (20′ FCL) | EVERLAM CLEARVIEW is shipped in a 20-foot full container load, with palletized rolls securely fastened and protected to prevent damage during transit. |
| Shipping | Ship EVERLAM CLEARVIEW as non-hazardous goods in original protective packaging, using pallets and corner protection to prevent scratching. Keep dry, avoid direct sunlight, heat, and UV exposure during transit. Use covered, well-ventilated vehicles; secure loads properly. Label as fragile, and include handling instructions and safety data sheets as required. |
| Storage | Store EVERLAM CLEARVIEW in its original, sealed packaging in a cool, dry area away from direct sunlight, UV exposure, and heat sources. Maintain moderate temperature and low humidity to prevent moisture absorption or distortion. Keep rolls flat or upright as recommended, protected from dust and damage. Use stock rotation (FIFO) to ensure material freshness. |
| Shelf Life | Shelf life is typically 12 months when stored unopened in original containers in a cool, dry place away from sunlight. |
For exterior architectural safety glazing, the EVA interlayer is positioned between two glass lites and cured under vacuum to produce monolithic laminated safety glass. The glass substrate is cleaned with demineralized water having conductivity below 30 µS/cm and dried with air knives before layup. The formulation addition ratio in the laminate stack is one 0.76 mm EVERLAM CLEARVIEW interlayer per 12 mm total glass thickness, equivalent to a film-to-glass thickness ratio of 1:15.8 when the interlayer is placed between two 6 mm thermally tempered glass lites; interior partition panels commonly use 0.38 mm film between two 4 mm annealed lites. The uncured film does not develop load-bearing adhesion in the cold condition. Peroxide decomposition and silane grafting to the glass surface require heating to 135–140 °C under -0.085 MPa vacuum for 90–120 min in a vacuum bag oven or silicone membrane press. Compliance for fall protection and safety glazing is assessed under EN 12600:2002, with the laminated panel typically classified to class 2B2 or 1B1 depending on the total build-up and glass type; visual quality is evaluated against EN ISO 12543-2:2021, while North American safety glazing requirements reference ANSI Z97.1-2015 and CPSC 16 CFR 1201. On manufacturing lines without autoclaves, a recurring failure mode is edge de-airing when the vacuum bag collar compresses the interlayer edge before the core reaches 80 °C, generating edge clouding that is detected only after final cool-down. Operators therefore hold bag pressure below -0.07 MPa during the first 20 min and do not release vacuum until panel temperature falls below 50 °C. Terminal product types include overhead canopies, structural glass fins, balcony balustrades, point-fixed façade panels, and storefront safety glazing.
Interior decorative lamination lines using EVA film typically operate with two plies of 0.38 mm EVERLAM CLEARVIEW placed on either side of a 0.25–0.50 mm decorative insert—woven fabric, printed PET film, cellulose paper, or perforated metal mesh—between two 4 mm low-iron glass outer lites. The unwound insert is pre-dried at 60 °C for at least 4 h when ambient relative humidity exceeds 60 %, because residual moisture in paper or natural fibres converts to steam and creates delamination bubbles at the insert–film interface. The film-to-glass thickness ratio is approximately 1:10.5 based on total glass thickness, with the decorative insert excluded from the structural build-up calculation. Processing is performed in silicone membrane presses or vacuum bag ovens; the assembly is heated to 125–130 °C and held for 60–75 min, a lower temperature than exterior safety glass to prevent yellowing or shrinkage of the decorative substrate. Vacuum is maintained during cooling to below 45 °C to control differential thermal contraction between the metal mesh and the glass. Industry compliance for visual quality follows EN ISO 12543-2:2021, while emissions and fire performance for interior panels are evaluated against the applicable building code; when a decorative panel must meet EN 13501-1:2018, a full system test is required because the EVA interlayer is classified only within the laminated glass system. A typical production bottleneck is batch-to-batch variation in printed PET film thickness, which can shift the total stack height by ±0.05 mm and alter edge squeeze-out; laminators therefore measure the stack at five points before entering the press. Terminal products include glass partitions, door panels, backsplashes, wall cladding, countertops, and decorative glass furniture components.
When a crystalline-silicon string enters the laminator for photovoltaic module production, the front-side EVA film is fed from a roll at a nominal thickness of 0.45 mm between 3.2 mm low-iron patterned glass and the cell matrix, with a rear-side 0.45 mm EVA film between the cells and the backsheet or rear glass. The encapsulant-to-glass thickness ratio is approximately 1:7.1 on the front side, and the film must exhibit sufficient flow before peroxide cure to fill inter-cell gaps without displacing string ribbons. Vacuum lamination is performed on heated-platen laminators at a chamber temperature of 145 °C for 16–20 min, with a three-step pressure profile that holds the membrane at 30 kPa during outgassing before increasing to 100 kPa for crosslinking. Gel content after lamination is measured by ASTM D2765-16 Method A and is typically controlled above 80 %; this threshold ensures mechanical stability during thermal cycling while maintaining adhesion from silane coupling agents to the glass and backsheet surfaces. The module compliance pathway for design qualification is IEC 61215-1:2021 and IEC 61215-2:2021, while safety qualification is governed by IEC 61730-2:2016; modules sold in North America are additionally evaluated to UL 1703. The encapsulant film is also assessed under the EU REACH Regulation (EC) No 1907/2006 and, as an article, under 2011/65/EU RoHS when incorporated into electrical or electronic modules. Production-scale experience shows that front EVA film slip on the heated platen can cause cell displacement when the stringer conveyor speed exceeds 2.2 m/min, so several lines use pin-free lamination beds or reduce platen temperature during the first 90 s. Another bottleneck is residual moisture in the backsheet; pre-drying backsheet rolls at 40 °C for 2 h before layup reduces bubble formation at the backsheet interface. Terminal product types include monofacial rooftop modules, bifacial glass-glass modules, building-integrated photovoltaic spandrel panels, and semi-transparent façade elements.
In high-velocity windborne-debris zones, multi-ply EVA interlayer stacks are specified in laminated glass because the cured interlayer must retain glass fragments after missile impact and cyclic pressure loading. The standard impact-resistant build-up for window and door panels uses 1.52 mm EVA film between 5 mm heat-strengthened glass outer lites, producing a film-to-glass thickness ratio of 1:6.6; for large-missile doors, a second 1.52 mm EVA ply and additional 5 mm glass lite are inserted to create a glass/EVA/glass/EVA/glass stack. The lamination process is a staged vacuum bag or membrane cycle: the pack is held at 80 °C for 20–30 min to allow de-airing before the oven ramps to 135 °C for 120–150 min at -0.085 MPa. Premature pressure release before core temperature falls below 60 °C generates edge blisters and can reduce post-impact fragment retention. Compliance for windborne-debris resistance is anchored to ASTM E1996-17 for missile spectrum selection and ASTM E1886-19 for impact and cyclic pressure test method; products for Miami-Dade County additionally follow TAS 201-94, TAS 202-94, and TAS 203-94. Because EVA is hygroscopic relative to PVB at the cut edge, exterior installations require an edge sealant compatible with the interlayer and a glazing rebate that limits standing water; published data for specific sealant compatibility with this EVA formulation is limited and should be verified by third-party edge adhesion testing before project specification. Terminal products include hurricane-impact windows, sliding glass doors, curtain wall spandrels, and garage door lites in coastal and windborne-debris regions.
Point-fixed balustrade panels fabricated with EVA interlayers require careful edge detailing because the point connector creates a local stress concentration that can initiate interlayer tearing if the glass has not been properly tempered. The standard build-up uses a single 1.52 mm EVA interlayer between two 10 mm thermally toughened glass lites, yielding a film-to-glass thickness ratio of 1:13.2; panels are laminated in a vacuum bag or silicone membrane press at 135–140 °C for 120–150 min. Post-lamination CNC hole drilling is preferred over pre-drilling because drilling after lamination removes edge defects introduced by glass cutting and prevents the film from flowing into pre-drilled holes during the cure cycle. The panels must satisfy the safety glazing requirements of EN 12600:2002 and the visual requirements of EN ISO 12543-2:2021; imposed loading is assessed under EN 1991-1-1:2002 for occupancy use, and point-fixed assemblies are designed following the respective national glass design code, often EN 16612:2019 or ASTM E1300-23. A field failure mode on cantilevered balustrades is interlayer pull-out at the edge of the point-fixing hole when the interlayer is not fully cured at the glass edge; line operators therefore verify gel content at the hole edge using ASTM D2765-16 sampling instead of relying on centre specimens. EVA-based laminates should not be sealed with ketone-containing or amine-based edge sealants without compatibility testing because solvent migration can reduce interfacial adhesion. Terminal products include point-fixed balustrades, glass fins, glass canopies, and railing systems in residential and commercial buildings.
In walkable glazing assemblies, the EVA interlayer stack functions as both a crack-bridging layer and a moisture barrier between tempered glass plies. A typical glass floor panel uses three plies of 1.52 mm EVA between two 12 mm fully tempered glass outer lites, producing a total interlayer thickness of 4.56 mm within a 24 mm glass stack and a film-to-glass thickness ratio of 1:5.3. The multi-ply stack is de-aired in a vacuum bag with pleated edges to prevent bridging; the oven profile begins with a 70–80 °C soak for 30 min, followed by a ramp to 135 °C and a hold of 150–180 min under -0.085 MPa to cure the full thickness. After cooling below 50 °C, edges are trimmed and drilled; all cut edges must be polished and sealed because an exposed EVA edge absorbs moisture and can develop interfacial haze. Structural verification for walkable glazing follows EN 1991-1-1:2002 imposed load categories, while the glass strength design uses EN 16612:2019 or ASTM E2751/E2751M-17a for US-marketed panels; safety performance is additionally tested under EN 12600:2002 or ANSI Z97.1-2015. A specific production limitation is the risk of glass slip during vertical layup of thick stacks; laminators use flat transport trays and alignment fixtures sized for the full glass stack mass, and published data for this specific multi-ply configuration under dynamic pedestrian loading is limited. Terminal products include interior glass floors, walkable skylights, observation deck panels, bridge glazing, and cantilevered glass treads.
Competitive EVERLAM CLEARVIEW prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
EVERLAM CLEARVIEW is a polyvinyl butyral interlayer supplied for laminated safety glass and laminated glass configurations in architectural and transport glazing. The ClearView designation identifies a clear, neutral interlayer within the Everlam PVB range, produced in the standard modular thickness sequence of 0.38 mm, 0.76 mm, 1.14 mm, 1.52 mm, 2.28 mm, and 3.04 mm. Each nominal thickness refers to the pre-lamination interlayer contribution. The material is formulated to maintain controlled flow during vacuum de-airing and autoclave bonding, with optical quality limits that distinguish it from general-purpose clear PVB. Laminators specify ClearView where neutral transmitted colour, low visible haze, and reproducible interlayer thickness are required by glazing documentation. The product is not a structural or acoustic interlayer; it is positioned as a clear PVB grade for standard safety glazing, interior partitions, facades, and overhead panels when paired with the correct glass configuration.
In thin-ply construction using 0.38 mm ClearView, edge flow is more sensitive to moisture and temperature than in 1.52 mm or multi-ply builds. Interlayer moisture should be maintained in the range of 0.35% to 0.50% by mass before lamination. Moisture above 0.60% can generate steam at autoclave temperature and produce edge bubbles, while moisture below 0.30% reduces tack and can prevent complete glass wetting. Conditioning is typically performed at 18°C to 25°C and 40% to 60% relative humidity. Thin films reach the upper moisture limit more rapidly than thicker films; in an uncontrolled room, 24 h exposure can shift the moisture content beyond the acceptable upper bound. Laminators should not condition 0.38 mm ClearView alongside 2.28 mm or 3.04 mm material under identical time cycles because the thinner film absorbs moisture faster and can leave the safe processing window before the thicker film reaches equilibrium.
Roll stock is supplied on moisture-resistant cores with edge protection and sealed polyethylene wrap. The outer wrap should remain sealed until the roll temperature has equilibrated to the clean-room or lamination hall environment. Condensation on a cold roll transfers liquid water to the interlayer edge and, if trapped during assembly, appears as edge voids in the autoclaved panel. Rolls are stored horizontally on prepared cradles rather than on the film edge, because core indentation can produce a thickness band that later becomes visible in transmitted light. Cutting is carried out in a conditioned space using guillotine or ultrasonic cutting equipment, and the interlayer is assembled over the glass within the same space to limit dust pick-up. ClearView is sensitive to particulate contamination because a clear interlayer does not visually mask embedded particles; fabrication records indicate that thin 0.38 mm plies are especially prone to visible defects when assembly-room cleanliness is insufficient.
ClearView film is supplied in architectural roll widths commonly ranging from 1,830 mm to 3,210 mm, depending on line availability and regional delivery format. Roll length is thickness-dependent: thinner films can be wound to greater lengths without exceeding core diameter limits. The approximate density of the PVB interlayer is 1.07 g/cm³, with batch-specific values stated on the certificate of analysis. Tensile properties and adhesion vary by lot and by moisture condition; published batch-specific tensile data for multi-ply ClearView configurations above 2.28 mm is limited, so project qualification should rely on the manufacturer’s certificate for the specific lot. The interlayer is supplied with a controlled surface roughness on both faces to support de-airing. The texture must remain intact through storage and cutting; rewinding at high tension or stacking rolls beyond the specified stack limit can reduce surface roughness and create local blocking, which later traps air during lamination.
| Requirement area | Standard or test method | Typical control parameter |
|---|---|---|
| Laminated safety glass classification | EN ISO 12543-2:2021 | Glass configuration and interlayer thickness |
| Durability test sequence | EN ISO 12543-4:2021 | Condensation, UV, temperature cycling |
| Impact performance | EN 12600:2002 / ANSI Z97.1 | Pendulum impact or drop-ball classification |
| Interlayer haze | ASTM D1003 | Low haze after lamination |
| Moisture content | Oven-volatiles or Karl Fischer titration | 0.35%–0.50% by mass |
Autoclave bonding of ClearView follows the pressure and temperature sequence used for standard PVB interlayers, typically 12 bar to 14 bar at 135°C to 145°C, with a plateau hold of 30 min to 60 min. Pressure is applied only after the autoclave has heated the glass and interlayer stack. A pressure drop below 12 bar during the plateau phase can leave residual microvoids that appear as haze or as localised de-lamination after thermal cycling. Early pressure application while the PVB is fully softened can force excessive edge flow, reducing edge thickness and creating a negative optical wedge. Pressure release before the glass cools below 60°C can allow entrapped air to expand and form bubbles. ClearView’s tighter optical classification does not remove the need for autoclave cycle control; it improves defect repeatability once the heat-pressure cycle is optimised for the specific glass build-up.
Flat architectural facades, point-supported canopies, interior partitions, and balustrades are typical end uses. In each application, the interlayer is not specified independently; system compliance depends on glass thickness, edge support, and framing. Overhead glazing commonly uses a minimum interlayer thickness of 0.76 mm, while point-supported assemblies frequently use multiple plies of 1.52 mm to control post-breakage sag. Thin 0.38 mm plies are used in multi-ply builds and in non-overhead interior applications. Edge deletion is performed when required by the framing system, but deletion must not exceed the minimum bite specified for the panel. For high-altitude projects, autoclave pressure and temperature curves are adjusted for the lower boiling point of any residual moisture; the same interlayer moisture limits still apply and are reached more quickly in low-pressure environments.
ClearView is a clear single-layer PVB interlayer. It is not formulated with the soft-core multilayer construction used in acoustic PVB, and it is not designed as a structural interlayer for elevated post-breakage stiffness. Compared with acoustic grades, ClearView does not claim frequency-dependent acoustic attenuation beyond the standard PVB baseline. Compared with structural PVB, ClearView has lower stiffness at elevated temperatures and is not the primary interlayer choice when blast, hurricane, or heavy-impact post-breakage performance governs the specification. Selection between ClearView and other Everlam grades is driven by the required glass classification under EN ISO 12543 and the design load. For standard safety glazing, balcony balustrades, and overhead panels, ClearView is combined with appropriate glass thickness to meet EN 12600 or ANSI Z97.1 requirements. For acoustic, structural, or burglar-resistant applications, the project specification may require a different grade and thicker multi-ply construction.
| Attribute | ClearView | Standard clear PVB | Acoustic PVB | Structural PVB |
|---|---|---|---|---|
| Primary function | Neutral safety and optical control | General lamination | Sound damping | Post-breakage stiffness |
| Layer architecture | Single clear layer | Single clear layer | Multilayer with soft core | Modified single or multilayer |
| Typical use | Facades, partitions, balustrades | General glazing | Transport and facades with acoustic targets | Overhead and structural glazing |
| Flow behaviour | Controlled flow, low edge defect | Standard flow | Adjusted de-airing required | Higher stiffness, reduced flow |
| Specification anchor | EN ISO 12543 | EN ISO 12543 | EN ISO 12543, ISO 16940 | EN ISO 12543, structural test methods |
At autoclave temperatures above 150°C, PVB interlayers can undergo accelerated oxidation and plasticiser migration. Yellowing is evaluated after 100 h UV exposure under EN ISO 12543-4:2021. ClearView contains UV stabilisers, but the stabiliser package does not permit indefinite exposure to edge UV. In exposed edge applications, a durable edge seal or frame cover is required. The degradation pathway begins with plasticiser loss at the exposed interlayer edge, followed by microcracking and adhesion loss. Because ClearView is clear, early yellowing is more detectable against white or neutral backgrounds than in tinted interlayers. Batch-to-batch optical variation in UV-facing installations is controlled through spectrophotometric transmission data and haze measurement under ASTM D1003. Laminators should not assume that the UV stabiliser package replaces edge protection in weather-exposed glazing.
Bent laminated glass production imposes additional constraints. The interlayer is cut oversize to allow slip during bending and is trimmed after the autoclave. If the PVB layer softens too early during the bending cycle, it can adhere to hot glass and wrinkle. Some lines use talc-free parting films or controlled water mist to manage slip; talc is avoided because residue can nucleate optical defects in clear interlayers. For tight-radius architectural bends, multiple thin plies of ClearView are often preferred over one thick ply because the thinner plies conform with lower residual stress and exhibit less edge springback. The target edge displacement after bending is typically kept below 2 mm over 1 m of edge length. Bent work requires the same moisture control as flat lamination, but the pre-bending heat can accelerate moisture loss at exposed edges and create local adhesion variation.
Adhesion of ClearView to glass is controlled through glass cleaning, moisture conditioning, and lamination cycle parameters. Pummel testing or compressive shear testing is used as a production control method on representative samples. Typical architectural PVB pummel values fall between 3 and 7, but the acceptable range depends on glass type, edge condition, and product specification. ClearView is not supplied with an adhesion promoter; adhesion is controlled primarily by surface chemistry and moisture. Glass washed with contaminated rinsing water or stored in a humid environment before assembly can shift adhesion and produce low pummel results despite correct interlayer moisture. Conversely, overdrying the interlayer below 0.30% moisture can increase adhesion excessively and reduce impact performance. The clear formulation makes delamination or residue at the glass-interlayer interface visible during backlight inspection, which increases the need for consistent glass washing and drying before assembly.
Rail glazing and bus windscreen lamination impose additional thickness stratification because the interlayer must maintain panel shape after breakage while meeting optical requirements for driver sight lines. ClearView is used in some transport interior partitions where impact retention is specified by regional transport safety codes. Lamination lines for transport glass may use preheated glass and vacuum rings rather than vacuum-bag technology; the interlayer must remain dimensionally stable during ring placement. Because transport glazing often uses chemically strengthened or heat-strengthened thin glass, edge pinch and local de-airing are more critical. The ClearView grade’s controlled thickness profile reduces localised flow variation, but fabricators still must verify the ring vacuum level and temperature ramp to avoid edge air entrapment in the finished panel.
