| HS Code | 293884 |
| Tensile Strength | >20 MPa (typical) |
| Elongation At Break | >250% (typical) |
| Modulus Of Elasticity | High stiffness; storage modulus approximately 30 MPa at 23°C, 1 Hz |
| Glass Transition Temperature | ~30°C |
| Service Temperature Range | -20°C to +70°C (typical) |
| Light Transmission | >90% (clear glass laminate) |
| Haze | <1.0% |
| Uv Absorption | >99% below 380 nm |
| Adhesion To Glass | Excellent after lamination |
| Density | ~1.07 g/cm³ |
| Dimensional Stability | Good, low shrinkage during lamination |
| Moisture Content | ≤0.5% as supplied |
As an accredited Trosifol Extra Stiff Pro factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol Extra Stiff Pro is packaged in protective sealed rolls, each containing 100 m², secured for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading: Trosifol Extra Stiff Pro is securely palletized, wrapped, and protected against moisture for safe transport. |
| Shipping | Trosifol Extra Stiff Pro is shipped as rolled film on pallets, sealed in moisture-barrier packaging to prevent humidity absorption. Store and transport cool, dry, and protected from direct sunlight. Not classified as dangerous goods. Handle carefully to avoid edge damage or deformation during transit. |
| Storage | Store Trosifol Extra Stiff Pro in its original sealed packaging in a cool, dry, well-ventilated area. Avoid direct sunlight, heat sources, and high humidity. Keep rolls flat or upright as recommended, protected from dust and physical damage. Maintain moderate temperatures (ideally 5–30°C) and use within specified shelf life. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored unopened in a cool, dry place. |
In point-fixed façade fins where the interlayer acts as the primary shear coupling between heat-strengthened glass skins, Trosifol Extra Stiff Pro is laid up as a multi-ply stack rather than a single extruded sheet. A common build-up consists of 8 mm heat-strengthened low-iron glass / 1.52 mm interlayer / 8 mm heat-strengthened low-iron glass, with the interlayer edge offset 2–3 mm outside the glass edge before autoclaving and trimmed after cooling. The roll is conditioned in sealed aluminium-polyethylene packaging at 20–22°C and 25–30% RH for 24 h before layup. Cleanroom layup is maintained at 18–20°C and 22–25% RH; moisture regain above 0.45 wt% in the sheet is associated with edge bubble formation during autoclave exposure. Vacuum bag de-airing is performed at -0.80 bar to -0.85 bar for 45–60 min, with edge temperature held between 40°C and 60°C to initiate edge tack without sealing off air channels. The autoclave profile ramps the charge to 138–142°C and holds 12.5–13.5 bar for 90 min, plus 15 min for each additional millimetre of total glass thickness above 12 mm; cooling is constrained to 0.4°C/min down to 45°C before pressure release. Pummel adhesion is targeted at 4–6 units on both glass surfaces to balance retained impact performance against edge delamination under prevailing wind suction. Short-duration shear transfer is evaluated under EN 16612:2019, and load resistance is checked against ASTM E1300-23. Terminal products include cantilever canopy fins, glass beam segments and point-fixed mullion fins.
The governing failure mode in load-bearing glass floors is not initial glass fracture but post-breakage sag and loss of residual stiffness after the upper lite cracks. For glass treads and structural floor panels, the layup uses heat-soak-tested toughened low-iron glass on both faces, typically 6 mm top lite / 4.56 mm interlayer formed from three plies of 1.52 mm Trosifol Extra Stiff Pro / 6 mm bottom lite. The toughened glass is processed through EN 14179:2016 heat-soak testing to reduce NiS inclusion fracture risk. Nip-roller pre-lamination is excluded for interlayer stacks above 2.28 mm because ambient-temperature nip rolling traps air at the ply interfaces; instead, a two-stage vacuum bag pre-press is used: 60 min at room temperature followed by 30 min at 85°C under -0.85 bar. The autoclave cycle then ramps to 140°C and 12.5 bar for 120 min, with pressure maintained during cooling until the charge falls below 50°C. Glass edge preparation uses arrissed edges with a 1 mm chamfer to reduce point-load stress concentration at the interlayer edge. The interlayer does not replace glass thickness in static load calculations; it extends post-breakage retention and reduces the risk of total panel collapse. Residual load capacity after top-glass fracture is determined by project-specific static point-load testing because published data for this exact interlayer stack in point-loaded glass floor configurations is limited. Compliance is referenced through EN 12600:2002, EN 16612:2019, and ASTM E2751 for supported laminated glass walkways.
Horizontally oriented missile impact assemblies in wind-borne debris regions require a higher adhesion set-point than point-fixed structural glazing. For curtain wall spandrel zones and balcony doors, the typical laminate is 5 mm heat-strengthened glass / 1.52 mm Trosifol Extra Stiff Pro / 5 mm heat-strengthened glass, with the interlayer conditioned to 0.40 wt% moisture content before layup. Vacuum bag de-airing is performed at -0.85 bar for 50 min, followed by an autoclave cycle of 138°C and 13 bar for 90 min. The pummel adhesion target is raised to 6–8 units because impact-induced delamination and edge pull-out are the dominant failure modes under ASTM E1996-17 missile impact and ASTM E1886-19 cyclic pressure loading. The laminate is additionally checked against CPSC 16 CFR 1201 Category II for safety glazing. After missile impact, cyclic pressure differentials are applied; interlayer tearing at the point of impact and glass edge pull-out are considered terminal failure criteria. The edge offset before autoclaving is kept at 3 mm to allow clean trimming without introducing edge nicks that can propagate during cyclic loading.
| Application requirement | Primary standard or code | Test focus |
|---|---|---|
| Point-fixed structural glazing | EN 16612:2019, ASTM E1300-23, ISO 12543-2:2021 | Effective shear transfer, bending resistance |
| Glass floors and stair treads | EN 14179:2016, EN 12600:2002, ASTM E2751 | Post-breakage retention, point-load capacity |
| Wind-borne debris glazing | ASTM E1996-17, ASTM E1886-19, CPSC 16 CFR 1201 | Missile impact, cyclic pressure, safety retention |
| Balustrade and barrier infill | EN 12600:2002, DIN 18008-4, EN 12150:2019 | Impact classification, barrier load transfer |
| Glass-glass BIPV modules | IEC 61215-2:2021, IEC 61730-1, IEC 61730-2, UL 1703 | Module safety, insulation resistance, wet leakage |
| Overhead sloped glazing | EN 16612:2019, EN 12600:2002, ASTM E1300-23 | Retention under snow load, impact classification |
For balustrade infill panels that are clamped through drilled holes rather than edge-framed, the interlayer is selected for shear stiffness and reduced long-term creep under sustained panel self-weight. A common make-up is 10 mm thermally toughened low-iron glass / 1.52 mm Trosifol Extra Stiff Pro / 10 mm thermally toughened low-iron glass. Holes are CNC waterjet-cut or drilled before tempering because tempered glass cannot be cut or drilled after heat treatment; hole diameter is typically 30–40 mm, with edge distance not less than 80 mm from any glass corner. Hole edge quality is specified through EN 12150:2019 for thermally toughened glass. The lamination process uses vacuum bag de-airing at -0.80 bar for 55 min and autoclave curing at 138–140°C and 13 bar for 100 min. Around each point-clamp hole, the interlayer experiences the highest shear stress under out-of-plane loads; edge delamination around holes is therefore checked after autoclaving using a backlit edge inspection at 10–15× magnification. Creep under sustained load is assessed through the effective shear transfer coefficient in EN 16612:2019. The terminal products are frameless glass balustrades, Juliet balcony infills and barrier glazing in commercial atria.
The lamination sequence for building-integrated photovoltaic modules using PVB differs from EVA or POE vacuum lamination because PVB requires autoclave pressure after degassing. Trosifol Extra Stiff Pro is laid up in glass-glass BIPV stacks where the interlayer must transmit shear between the front glass and the back glass while embedding the cell string and busbar ribbons. A representative stack is 3.2 mm tempered anti-reflective coated front glass / 1.52 mm interlayer above the cell string / 1.52 mm interlayer below the cell string / 3.2 mm heat-strengthened back glass. Layup is performed at 20°C and 25% RH; the cell string is positioned with busbar ribbons isolated from edge moisture paths. Vacuum bag degassing at -0.85 bar for 50 min is followed by an autoclave cycle of 140°C and 12.5 bar for 110 min. The interlayer bonding around busbar ribbons is inspected for void content because localised voids become hot-spot initiation sites during module thermal cycling under IEC 61215-2:2021. Terminal products are BIPV façade modules, spandrel panels and overhead solar canopies requiring safety-glazing performance and module-level compliance with IEC 61730-1 and IEC 61730-2.
After top-glass fracture in sloped roof glazing, the interlayer must retain glass fragments for sufficient time to allow safe evacuation and replacement. Load-bearing roof panels typically use a heat-strengthened outer lite rather than fully tempered glass because heat-strengthened glass fractures into larger fragments that remain attached to the interlayer. A representative sloped-glazing build-up is 10 mm heat-strengthened outer glass / 1.52 mm Trosifol Extra Stiff Pro / 12 mm heat-strengthened inner glass. Layup occurs at 18–20°C and 22–25% RH, with the interlayer moisture content held below 0.45 wt%. Vacuum bag de-airing is performed at -0.80 bar for 60 min, and the autoclave cycle is 140°C at 13 bar for 120 min. The panel is evaluated for short-duration wind suction and long-duration snow loading under EN 16612:2019, with impact classification checked through EN 12600:2002. For skylights and atrium roofs, the interlayer edge is protected from direct UV exposure because prolonged edge UV exposure can cause visible interlayer discolouration at the cut edge. Terminal products include overhead glazing, sloped atria and roof-light laminates where retained glass post-fracture is a regulatory requirement.
Competitive Trosifol Extra Stiff Pro 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!
Trosifol Extra Stiff Pro is a polyvinyl butyral interlayer manufactured by Kuraray for use in laminated safety glass. The product is supplied in rolled sheet form with nominal thicknesses of 0.76 mm, 1.52 mm, and 2.28 mm, allowing single-ply or multi-ply interlayer build-ups without adhesive films. Moisture content at packaging is controlled to a maximum of 0.4 wt%. Storage and handling are normally maintained between 18 °C and 25 °C at 20% RH to 40% RH. The film has an embossed surface to support mechanical de-airing during glass lay-up.
The interlayer is neither a low-stiffness acoustic PVB nor an ionoplast structural interlayer. It is positioned between these classes for glass laminates in which deflection control, residual stiffness after fracture, and compatibility with conventional PVB lamination lines are simultaneous requirements. Published data for the exact viscoelastic shear modulus of Trosifol Extra Stiff Pro across temperature and load duration is limited outside the current Kuraray technical bulletin. Generic plasticized PVB modulus values should not be used in design without written confirmation for this specific product.
Conventional plasticized PVB used in architectural glazing typically exhibits a shear modulus below 10 MPa at room temperature under short-duration loading and softens progressively above 30 °C. Extra Stiff Pro shifts the modulus-temperature response upward relative to that baseline, which can reduce shear deformation across the laminate stack when the effective thickness is calculated under ASTM E1300-23 or EN 16612:2019. The shift is not equivalent to replacing PVB with ionoplast. Ionoplast interlayers retain significantly greater stiffness at temperatures above 50 °C and under sustained load. Substitution of Extra Stiff Pro for ionoplast therefore requires load-duration and temperature-specific verification, not a simple equal-thickness replacement.
Tensile characteristics and film uniformity are commonly evaluated under ISO 527-3:2018. Laminate-level stress transfer is confirmed through full-size testing under EN 12600 pendulum impact or ASTM E330 load resistance. Because the interlayer has higher stiffness than standard plasticized PVB, it can produce a greater degree of composite action between glass plies under short-duration loading. However, the degree of composite action remains time-dependent and temperature-dependent. Published data for large-format structural configurations using this specific interlayer is limited outside controlled product testing.
In laminated balustrade and overhead applications, the product is evaluated for impact classifications such as 2B2 or 1B1 under EN 12600, depending on glass type and heat treatment. Multi-ply interlayer stacks can increase post-breakage retention without increasing the number of glass plies, but the actual residual load path is controlled by edge bite, interlayer adhesion, and glass fragmentation pattern. Full-scale breakage tests must be performed on the final laminate construction rather than inferred from interlayer tensile data alone.
When used in point-supported overhead glass, snow accumulation and dead-load duration become the controlling shear-transfer case. At 20 °C, PVB-based interlayers creep and transfer less shear over sustained loading intervals than under wind gust loads. For Extra Stiff Pro, published data for this specific configuration is limited. The designer must obtain shear interaction coefficients valid for the governing load duration and must not rely on short-term interlayer modulus values for long-duration deflection verification.
Post-breakage performance depends on interlayer adhesion, elongation, and tear propagation, not on pre-breakage stiffness alone. Laminates produced with Extra Stiff Pro should be evaluated in the fractured state using concentrated loads, such as AS/NZS 2208 penetration and retained-impact protocols, or project-specific horizontal fall protection testing. Because the material is stiffer than standard PVB, fracture-induced stress concentrates more sharply at the crack line. The resulting tighter hinge may be beneficial for short-span residual retention but can reduce energy redistribution in larger panels. Full-scale validation is required because published data for post-breakage retained strength of this specific configuration is limited.
In structural glass fins and beams with point-fixed fittings, increasing interlayer thickness does not improve behavior indefinitely. Finite-element models using EN 16612:2019 can capture the loss of shear transfer at elevated temperature and long load duration. Evaluations often show that deflection reductions diminish beyond interlayer thicknesses of 1.52 mm to 2.28 mm when service temperatures exceed 40 °C, because the PVB shear transfer coefficient falls. A fixed composite-action assumption at higher temperatures is therefore not conservative for this product class.
Processing of Extra Stiff Pro on production-scale PVB laminating lines generally follows conventional PVB practice but with preheat and autoclave settings at the upper end of the standard window. Glass is washed with deionized water, and the nip-roll preheat zone is maintained between 60 °C and 70 °C to achieve adequate edge sealing. Autoclave cycles operate between 1.0 MPa and 1.5 MPa at 130 °C to 140 °C, with hold times from 30 min to 60 min depending on laminate thickness. The higher stiffness of Extra Stiff Pro reduces conformability to curved substrates. Curved laminates require trial runs to adjust preheat and vacuum extraction time before production batches are committed.
Moisture control is a primary operational boundary. At ambient relative humidity above 60% RH, the interlayer may require pre-conditioning in a humidity-controlled cabinet to maintain moisture below 0.4 wt% before lay-up. Rolls should not be left uncovered beyond the manufacturer’s recommended open-time. Adhesion inconsistency and edge haze can occur when roll ends are exposed to humid air; these defects are detected by visible inspection and adhesion testing according to ISO 12543-4.
Heat-strengthened and fully tempered substrates are acceptable in flat configurations. The interlayer does not compensate for excessive roller-wave distortion. When glass surface waviness exceeds the optical flatness specification for the fabricated laminate, nip-roll de-airing becomes uneven and edge air pockets may survive autoclaving. Optical quality is then assessed under ISO 12543-6 or project-specific roll-wave mapping. Holes, notches, and edge profiling should be completed before lamination because post-lamination drilling can generate heat at the cut edge and locally damage the interlayer.
Replacing a standard PVB interlayer with Extra Stiff Pro in an existing laminate design does not automatically permit the same glass thickness to be retained. The change in interlayer shear transfer affects deflection, stress distribution, and hardware load transfer. Glass thickness may be optimized only after re-running the laminate effective thickness calculation under ASTM E1300-23 or EN 16612:2019. Similarly, replacing ionoplast with Extra Stiff Pro must include a check of post-breakage retained strength, long-term creep, and edge-seal compatibility. Substitution without reanalysis is not supported by the available data.
For projects requiring blast or seismic performance, the interlayer should be evaluated through dynamic testing such as ASTM F1642 or project-specific cyclic racking tests. The higher stiffness of the product can alter fracture pattern and energy dissipation relative to standard PVB. Published data for the dynamic response of this specific configuration is limited, so component-level dynamic testing is recommended before project approval.
Compliance is assessed on the final laminated glass assembly, not on the interlayer alone. The following standards are commonly invoked when Trosifol Extra Stiff Pro is used in architectural glazing. The list does not establish product certification by itself.
| Standard | Role in Laminate Verification |
|---|---|
| ISO 12543-2 | Safety requirements for laminated safety glass |
| ISO 12543-3 | Requirements for laminated glass |
| ISO 12543-4 | Durability test methods for laminated glass |
| EN 12600 | Pendulum impact test for safety glass classification |
| EN 16612:2019 | Calculation of load resistance of laminated glass using interlayer shear transfer |
| ASTM E1300-23 | Determining load resistance and deflection of glass in buildings |
| ASTM D638-14 | Tensile characterization of polymeric materials |
| ISO 527-3:2018 | Tensile testing of film and sheet for interlayer quality control |
Edge-seal compatibility with structural silicone is not established by interlayer data alone. Some neutral-cure silicone formulations and PVB interlayers show edge haze when the laminate edge is exposed to water or high humidity; the sealant and interlayer combination must be tested for the specific substrate preparation. For open-edge laminates in high-humidity environments, edge barriers and weather-tight joint details are required to prevent moisture ingress at the interlayer. Fabricators should confirm the sealant manufacturer’s documented compatibility data before glazing.
