| HS Code | 101451 |
| Product Type | PVB interlayer film for laminated glass |
| Uv Blocking Rate | Blocks 99% of harmful UV radiation up to 400 nm |
| Light Transmission | Provides high visible light transmission of approximately 90% |
| Optical Clarity | Offers excellent optical clarity with very low haze |
| Adhesion To Glass | Achieves strong adhesion to glass during lamination |
| Impact Resistance | Enhances resistance to impact and forced entry |
| Glass Retention | Holds glass fragments in place upon breakage |
| Weathering Resistance | Resists yellowing and degradation from long-term UV exposure |
| Lamination Compatibility | Compatible with standard autoclave lamination processes |
| Protective Application | Suitable for museum glazing and UV-sensitive displays |
As an accredited Trosifol UV Extra Protect factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol UV Extra Protect is supplied in protective sealed rolls, quantity: 100 square meters per roll. |
| Container Loading (20′ FCL) | Trosifol UV Extra Protect PVB film packed in moisture-proof rolls, loaded on pallets into 20′ FCL container for safe transport. |
| Shipping | Trosifol UV Extra Protect ships as rolled PVB interlayer film on spools, wrapped in moisture-barrier packaging with desiccant. Protect from water, humidity, and direct sunlight. Store cool and dry, keep upright, and avoid heavy stacking or sharp impacts during transport. Handle with clean gloves to prevent surface contamination. |
| Storage | Store Trosifol UV Extra Protect in its original, unopened packaging in a cool, dry area at 5–20°C. Avoid direct sunlight, heat sources, and moisture, as humidity can affect performance. Keep packaging sealed until use, protect from dust, and handle carefully to prevent damage. |
| Shelf Life | Store unopened in original packaging, cool and dry. Shelf life is 12 months from production date. |
In archival laminates and museum display glazing, the laminated unit is typically built as a 4 mm low-iron glass / 0.76 mm Trosifol UV Extra Protect interlayer / 4 mm low-iron glass stack, producing an interlayer mass fraction of approximately 3.9 wt% in the glass-interlayer-glass make-up; where acoustic or safety requirements are more severe, the stack is upgraded to 1.52 mm film and 6 mm glass, shifting the interlayer mass fraction to roughly 5.1 wt%. The relevant compliance framework is ISO 12543-2:2021 for laminated glass durability, EN 12600:2002 for pendulum impact classification, and EN 410:2011 or ISO 9050:2003 for spectral transmittance; conservators and façade consultants generally require UV transmittance below 1% across the 300–380 nm range, and the final verification must be carried out on the laminate, not on the film alone, because glass and lamination residues alter the spectral cut-off. The downstream process begins with deionized water washing of cut glass and drying to a surface temperature of 20–25°C; the interlayer is conditioned for at least 24 h at 18–22°C and 25–30% relative humidity to prevent moisture-related bubble formation. Lay-up is followed by two-stage de-airing on nip rollers heated to 120–180°C, then an autoclave cycle at 12–14 bar and 135–140°C for 90–150 min; large panels above 3.6 m edge length may require segmented vacuum rings during de-airing to avoid edge air pockets. Terminal products include free-standing archival vitrines, museum window replacements, art-storage observation panels, and UV-sensitive collection display doors, with the edge seal specified separately to prevent plasticizer migration into gaskets.
The automotive lamination line starts with bent glass rather than flat glass, and this shape constraint changes the acceptable interlayer thickness and de-airing parameters. Windscreen stacks commonly use 2.1 mm outer and 1.6 mm inner soda-lime glass with 0.76 mm interlayer, producing an interlayer mass fraction of approximately 8.1 wt%; panoramic roof panels may use 1.52 mm film between 2.1 mm and 1.8 mm glass. Type approval under UNECE R43 requires mechanical, optical, and environmental tests for laminated safety glazing, and OEM specifications add transmitted haze and distortion measurements per ASTM D1003 and ISO 14782; ultraviolet cut-off is reported according to the vehicle manufacturer’s spectral method, with values commonly below 1% in the 300–380 nm band. In production, the glass is screen-printed with ceramic frit, bent in a tunnel furnace, then transferred into a cleanroom maintained at 18–22°C and 30–45% relative humidity; the film is oriented according to the lay-up drawing and is not compounded with additional UV stabilizers downstream. De-airing may use an infrared preheating tunnel or nip-roller line at 60–180°C, followed by an autoclave holding 12–14 bar and 135–140°C for 90–150 min. One critical failure mode is edge haze after accelerated weathering when residual moisture at the glass/film interface exceeds 0.5 wt% or when the autoclave pressure release is initiated before the laminate temperature drops below 50°C. Terminal products include windshields, sidelites, and fixed panoramic roof panels for passenger vehicles and light commercial electric platforms.
For glass-glass photovoltaic building components, Trosifol UV Extra Protect is used as both encapsulation layer and safety interlayer in a stack of 3.2 mm tempered low-iron front glass, 0.76 mm or 1.52 mm interlayer, and 2.5–3.2 mm back glass, with the interlayer mass fraction in a 3.2 mm / 0.76 mm / 3.2 mm module approximately 4.8 wt%. The qualification route is IEC 61730-1 and IEC 61730-2 for module safety, IEC 61215 for design qualification, and ISO 9050 for optical transmittance; the electrical performance loss caused by ultraviolet absorption in the interlayer must be separated from encapsulation-related optical loss by comparing the UV-blocking laminate against a clear-PVB reference of identical thickness. Production equipment for PVB glass-glass modules is closer to a lamination autoclave line than to a conventional EVA vacuum laminator: the stack is assembled in a dry room at 18–22°C and below 35% relative humidity, de-aired through nip rollers, and autoclaved at 12–14 bar and 135–145°C for 60–120 min. Edge-trim tolerance is typically 0.5–1.0 mm, and the laminate must be free of air pockets larger than 1 mm at the cell edge. Published accelerated-aging data for this specific product in crystalline-silicon PVB modules is limited, so module manufacturers commonly require their own damp-heat and thermal-cycling qualification per IEC 61215 rather than assuming UV-exposure margin from the film datasheet. Terminal products include BIPV spandrel panels, solar canopies, bus-shelter roof modules, and semi-transparent façade modules where safety glazing and UV screening are specified in the same contract.
Unitized façade panels using this interlayer are usually designed under EN 13830:2015 for the curtain wall system and EN 12600:2002 or EN 356 for glass impact performance, while the glass stress calculation follows ASTM E1300 in North American projects. The laminated make-up for vertical vision glazing commonly uses 0.76 mm film between heat-strengthened or tempered glass plies of 6 mm to 8 mm, producing an interlayer mass fraction around 2.0–2.6 wt%; overhead and sloped glazing is upgraded to 1.52 mm film between 6 mm and 6 mm glass, with an interlayer mass fraction near 5.1 wt%, specifically because post-breakage retention and residual load-bearing capacity dominate the safety design. The downstream process is split between two factories: the laminator processes the glass-interlayer stack through washing, conditioned lay-up, nip-roller de-airing at 120–180°C, and autoclave at 12–14 bar and 135–140°C for 90–150 min; the unitized façade assembler then inserts the laminated glass into aluminum frames and applies structural silicone. A frequent interface issue is edge moisture penetration on site when the laminate edge is left uncovered in a drained glazing channel; the edge zone must be protected by a gasket, setting block, or sealant-compatible barrier because PVB is hygroscopic and loses adhesion below 0.5 wt% water content or under persistent condensation. Terminal products include unitized curtain wall panels, sloped atria, roof canopies, and point-fixed structural glass fins where the same laminate must serve both mechanical and ultraviolet screening functions.
In rail vehicle glazing, side windows and windscreens fabricated with 0.76 mm or 1.52 mm interlayers are qualified under EN 45545-2 for fire behavior and EN 12600:2002 or EN 15152 for impact resistance, while the vehicle body integration follows the relevant metro or mainline procurement specification. The glazing stack generally uses chemically strengthened or thermally toughened glass plies of 4 mm to 6 mm, with the interlayer at 0.76 mm for standard side windows and 1.52 mm for windscreens and driver partitions; in a 5 mm / 0.76 mm / 5 mm glass stack, the interlayer mass fraction is approximately 3.1 wt%. Lamination begins with cutting, edge seaming, ceramic frit printing, and glass strengthening, followed by conditioned lay-up in a cleanroom at 18–22°C and 25–35% relative humidity; de-airing uses a continuous nip-roller line at 60–120°C and the final autoclave runs at 12–14 bar and 135–140°C for 90–150 min. Batch records must demonstrate that the PVB moisture content before lay-up was below 0.5 wt% and that the autoclave pressure did not drop below 12 bar during the hold period, because partial pressure loss is a known cause of edge delamination in rail qualification tests. Terminal products include high-speed train windscreens, metro side windows, tram driver isolation screens, and emergency exit glazing where UV cut-off contributes to interior trim durability and passenger thermal comfort.
Sloped overhead projects impose a different boundary condition at the laminate edge because the edge is exposed to higher surface temperatures from solar gain and to water run-off under gravity. In canopies and sloped atria, the typical make-up is 6 mm heat-strengthened top glass / 1.52 mm interlayer / 6 mm heat-strengthened bottom glass, giving an interlayer mass fraction near 5.1 wt%; if the lower glass is laminated to another ply for maintenance access, the interlayer fraction remains below 5 wt% in the overall stack. Compliance references include ISO 12543-2:2021 for the laminated glass itself, EN 12600:2002 for impact, and ASTM E1300 for glass strength under sloped loading; thermal stress is evaluated with the specified worst-case solar absorption and edge shading conditions. The production route is identical in autoclave terms, but the process window is narrower: the nip-roller temperature must be raised to 170–200°C for 1.52 mm film to achieve complete edge adhesion, and the autoclave hold time is extended by 15–30 min when the laminate exceeds 4 m in edge length. The main rejection mode on canopy laminates is edge clouding after outdoor exposure, caused by moisture penetrating the trimmed PVB edge where the edge cover is too shallow or the sealant was applied before the laminate edge had cooled below 40°C. Terminal products include sloped overhead glazing, entrance canopies, skylight replacement laminates, and covered walkway panels where UV protection must survive continuous exposure rather than intermittent interior lighting.
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Trosifol UV Extra Protect is a plasticised polyvinyl butyral (PVB) interlayer grade produced by Kuraray under the Trosifol brand for laminated safety glass and laminated security glass. The material is supplied as a clear extruded sheet in nominal thicknesses of 0.38 mm, 0.76 mm, and 1.52 mm, with production widths extending to approximately 3210 mm; the final slit width is set by the laminator according to the cut-glass make-up. The grade is specified where the glazing must satisfy impact-safety criteria under EN 12600, ANSI Z97.1, or CPSC 16 CFR 1201 while also maintaining an ultraviolet absorption edge at approximately 380 nm. Supplier spectral data indicate that UV transmittance through the interlayer is held at or below 1% over the 300–380 nm band when evaluated by ISO 9050 or EN 410. In contrast, unmodified clear PVB grades generally show strong absorption below approximately 370 nm but may transmit a residual UV-A tail between 370 nm and 380 nm. The absorber package is dispersed in the polymer matrix during sheet extrusion, so the spectral cut-off is bulk-distributed through the full interlayer thickness and is not a surface coating that can be removed by edge finishing, drilling, or routine cleaning.
The practical optical difference between UV Extra Protect and a standard clear PVB interlayer is concentrated in the 370–380 nm UV-A band. Below 370 nm, both grades absorb strongly because of the base PVB chemistry and conventional UV stabilisation. Above approximately 380 nm, the interlayer is designed to transmit visible radiation without excessive attenuation. A steep transition between 370 nm and 400 nm therefore has disproportionate importance for UV-sensitive materials: even low integrated irradiance in the 370–380 nm region can contribute to photolytic degradation of fugitive colorants, natural fibres, and certain varnishes. When the laminated glass is assembled with low-iron glass, visible light transmittance remains configuration-dependent, governed by glass thickness, interlayer thickness, and any additional low-emissivity coating. The UV absorber in UV Extra Protect is selected to avoid broad absorption extending into the visible range; yellowness can be assessed on the interlayer or the laminate using ASTM D1003 or ISO 14782, and any perceptible yellow shift is normally tied to glass selection, edge seal exposure, or lamination history rather than to the UV edge itself.
The UV Extra Protect grade is part of the broader Trosifol PVB interlayer family and is distinct from Trosifol Clear and Trosifol UltraClear in its UV-edge specification. Trosifol Clear provides general-purpose safety-glass performance; Trosifol UltraClear is selected for high visible clarity and low haze; UV Extra Protect is selected when the spectral cut-off at 380 nm is the primary optical requirement. In laminated constructions where both low haze and UV protection are required, design teams may pair low-iron glass with UV Extra Protect and accept a slight spectral absorption; the exact luminous transmittance is calculated using the spectral data for the full glass build under ISO 9050.
In museum, archive, and conservation-glazing applications, the interlayer is commonly used inside display vitrines, stair-rail glazing, and separation screens where both object protection and occupant safety are required. Guidance such as CIE 157:2004 addresses damaging optical radiation to museum objects; for highly sensitive materials, a commonly cited ultraviolet exposure limit is on the order of 10 µW/lm. Laminated glass containing UV Extra Protect contributes to the UV-control layer of such an installation, but it does not replace lighting controls, HVAC management, or blackout periods. The interlayer can also be used in library glazing and retail display fronts where fading of textiles, prints, and packaging is a documented failure mode. In these applications, the material is specified not to increase the structural strength of the glass beyond the standard safety-glass function but to extend the spectral absorption edge while keeping the laminate fabrication route unchanged.
Surface-applied UV filters on monolithic glass or acrylic are sometimes specified for display cases, but they differ from a bulk PVB interlayer in durability and function. A film-coated glass may achieve a UV cut-off by reflection or absorption, but the coating is exposed to cleaning and can be scratched; in contrast, the UV absorber in Trosifol UV Extra Protect is enclosed between glass plies and is protected from mechanical damage. The PVB interlayer also adds the shear-deformation and post-breakage retention behaviour expected of laminated safety glass under EN 12600, which a surface filter does not. Compared with UV-absorbing acrylic sheets used in vitrines, PVB laminates can be fabricated in larger glass sizes and use standard structural edge support, but acrylic may offer lower weight and different impact response. Selection between these materials is therefore not a simple optical comparison; it includes safety-glazing classification, framing, cleaning, and service-life requirements.
The interlayer is hygroscopic and must be conditioned before lay-up. Typical storage conditions for PVB sheet are 15–25 °C and 20–30 % RH; the target sheet moisture content before lamination is approximately 0.35–0.45 wt%. Moisture above approximately 0.5 wt% is a known cause of edge milkiness and intermittent delamination because water at the glass–interlayer interface can reduce the adhesion-promotion chemistry and vaporise during autoclave heating. Excessively dry sheet, by contrast, can reduce tack and produce handling defects. Processors should record interlayer lot number, conditioning time, and ambient dew point so that edge-bubble failures can be traced to material condition rather than to glass cleaning or autoclave pressure loss.
Laminated glass with UV Extra Protect can be processed through vacuum-bag de-airing or nip-roller pre-press systems followed by autoclave curing. The critical processing window is determined by the PVB matrix, not by the UV absorber. In production-scale autoclave cycles, PVB laminates typically reach 1.2–1.5 MPa at 135–145 °C, with hold times from 60 minutes to 120 minutes depending on panel width, edge condition, and total glass thickness. Premature edge sealing before air removal leads to boundary-layer voids; this is observed on large panels as radial bubble clusters or as a distinct loss of adhesion around drilled holes and notches. On a nip-roller line, the first-meter tack-through may vary if the sheet temperature is too low; processors should maintain the same roll gap and preheat settings used for standard clear PVB of the same nominal thickness and validate adhesion on cut-edge coupons after the first autoclave run.
On a dual-pass vacuum-bag line, residual air removal is commonly monitored by bag pressure decay and by visual confirmation of edge transparency before the bag is sealed. Production-scale failure records in interlayer lamination indicate that edge voids are more common when the bag temperature is increased too rapidly above the interlayer softening point before the bag vacuum has reached a stable level. For UV Extra Protect, the same de-airing envelope as standard plasticised PVB applies, but operators should avoid reducing the ambient hold time merely because the sheet appears tack-free. The interlayer’s high UV absorption does not alter the need for full surface wetting of the glass by the PVB melt; incomplete wetting at cut-outs and drilled holes remains a cause of localised delamination.
Because the UV-absorbing additives are compounded during sheet extrusion, a slight shift in melt rheology relative to unmodified clear PVB may occur. Published data on line-specific melt flow variation for this exact grade are limited; a first-article validation is therefore warranted when changing from a standard PVB interlayer to UV Extra Protect on a line that operates near the bottom of its temperature window. The validation should include visible inspection for edge clarity, measurement of laminate haze per ASTM D1003, and adhesion testing by the laminator’s normal quality protocol.
In glazing configurations where post-breakage retention or blast resistance is the controlling requirement, UV Extra Protect can be positioned in a multilayer stack with a structural ionoplast or other high-stiffness interlayer. The PVB layer supplies the controlled absorption edge at 380 nm; the structural layer supplies higher tensile modulus and creep resistance. Ionoplast interlayers are significantly stiffer than plasticised PVB, with tensile modulus commonly above 300 MPa, whereas plasticised PVB is viscoelastic and exhibits considerably lower stiffness under long-duration load. The total interlayer build-up must be selected by the engineer against the applicable standard, such as EN 356 for resistance to manual attack or blast-related specifications where adopted; the UV-absorbing layer is not a substitute for structural interlayer thickness.
The interlayer remains compatible with low-emissivity and solar-control coatings, provided the coating is edge-deleted before lamination and the sealant system is selected for the coating surface. The UV absorber functions independently of the infrared-reflective coating; a low-E coating can reduce solar gain while UV Extra Protect handles the spectral band below 400 nm. In a triple-glazed laminated unit, the position of the PVB-bearing laminate is determined by thermal stress and condensation analysis, not by the UV absorber. Polycarbonate direct contact is a boundary condition: plasticiser migration from PVB can induce microcrazing in polycarbonate over time, so aliphatic urethane or ionoplast interlayers are preferred for polycarbonate-containing laminates unless long-term compatibility is demonstrated.
When the product is supplied for building glazing, the compliance matrix normally includes the interlayer material standard and the optical and mechanical standards applied to the finished laminate. The interlayer alone does not confer a safety rating; the complete glass unit must meet the applicable impact classification after lamination.
| Standard or code | Focus | Relevance to UV Extra Protect |
| ISO 12543-2 | Laminated safety glass interlayer material and dimensional tolerances | Basis for supplied PVB sheet thickness and lamination quality |
| ISO 9050 | Determination of light transmittance, UV transmittance, and related glazing factors | Used to verify UV transmittance in the 300–380 nm band |
| EN 410 | Determination of luminous and solar characteristics of glass in building | Used for spectral performance of the finished laminate |
| EN 12600 | Pendulum impact test for flat glass | Classifies the completed laminated safety glass |
| ANSI Z97.1 | Safety glazing materials used in buildings | Applicable to finished laminate in relevant markets |
| CPSC 16 CFR 1201 | Safety standard for architectural glazing | Applicable to impact-rated laminated glass assemblies |
| ASTM D1003 | Haze and luminous transmittance of transparent plastics | Used for interlayer or laminate haze checks |
| ISO 14782 | Haze of transparent plastics | Alternative haze measurement for PVB sheet |
| REACH Regulation (EC) No 1907/2006 Article 33 | Communication of substances of very high concern in articles | Supply-chain compliance for EU installations |
| RoHS Directive 2011/65/EU | Restriction of hazardous substances in electrical and electronic equipment | Relevant if laminated glass is part of EEE housing or display equipment |
The interlayer is intended for encapsulation between glass plies and should not be stored as a free film in direct sunlight for prolonged periods. Unlaminated PVB sheet absorbs moisture rapidly under high relative humidity; exposure at relative humidity above 40 % without protective packaging can shift the sheet moisture content outside the recommended lamination window within hours to days depending on thickness. Once the sheet has exceeded the moisture limit, it cannot be restored uniformly by simple surface wiping and must be reconditioned under controlled conditions or rejected.
Solvent compatibility is a further limitation. Aromatic hydrocarbons, ketones, and some esters can dissolve or excessively swell plasticised PVB, particularly at cut edges. Cleaning of finished laminated glass should be limited to mild aqueous detergents or solvents that are verified by the supplier for edge-system compatibility. Abrasive alkaline cleaners and acidic etching compounds can attack exposed interlayer edges and sealants, producing local haze or edge disbondment. In structural glazing applications, the sealant manufacturer’s adhesion data for PVB and glass should be consulted; PVB is generally compatible with neutral-cure silicones but can be sensitive to some solvent-release silicones and polyurethane chemistries if the interlayer edge is directly exposed.
Service temperature is another boundary condition. PVB is a thermoplastic interlayer and its shear transfer capacity declines as temperature rises; in warm climates, laminated glass can exhibit increased deflection under sustained load. The product should not be used as the sole structural interlayer in applications requiring high post-glass-breakage stiffness at elevated temperature. Published data for UV Extra Protect in long-term creep above 50 °C are limited; project-specific testing is advised when the laminate operates near this condition.
