| HS Code | 969495 |
| Product Name | Trosifol R3 |
| Material Type | Plasticized polyvinyl butyral (PVB) interlayer film |
| Density | 1.08 g/cm³ |
| Thickness Range | 0.38 mm to 1.52 mm |
| Refractive Index | 1.48 |
| Glass Transition Temperature | approx. 19°C |
| Tensile Strength | > 20 MPa |
| Elongation At Break | > 250% |
| Tear Strength | > 5 N/mm |
| Light Transmittance | 88-90% in laminated safety glass |
| Haze | < 1% |
| Uv Transmission | < 0.1% for wavelengths below 380 nm |
| Water Content | <= 2% at 23°C, 50% RH |
| Adhesion To Glass | 12-25 N/mm |
| Thermal Conductivity | 0.25 W/(m·K) |
As an accredited Trosifol R3 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol R3 is packed as rolls on cardboard cores, sealed in moisture-proof foil with desiccant. Quantity: one roll, 1.52 m × 100 m. |
| Container Loading (20′ FCL) | Trosifol R3 rolls are palletized, wrapped, and securely loaded into a 20′ FCL container for safe transport. |
| Shipping | Trosifol R3 (PVB interlayer film) ships as non-hazardous cargo on pallets, wound on cores in sealed moisture-barrier packaging. Keep dry, upright, and away from direct heat or sunlight. Avoid sharp impacts or crushing. Store at moderate temperatures before lamination. Standard truck or container transport is suitable with proper edge protection. |
| Storage | Store Trosifol R3 in its original, unopened packaging in a dry, cool, well-ventilated area away from direct sunlight, UV radiation, and heat sources. Maintain moderate temperature, ideally below 20°C, with low humidity. Keep rolls flat, protected from dust, moisture, and physical damage. Follow manufacturer’s shelf-life guidance for optimal performance. |
| Shelf Life | Trosifol R3 has a typical shelf life of 12 months when stored unopened in a cool, dry place. |
In point-fixed facades and overhead glazing, laminated glass units incorporating Trosifol R3 as a single 0.38 mm or 0.76 mm PVB interlayer are specified for post-breakage residual load capacity and fall protection under EN 14449 and EN 12600. Compliance under EN 14449 requires factory production control audits, initial type testing to EN ISO 12543-2, and impact classification to EN 12600; the interlayer mass fraction in a 3 mm / 0.38 mm / 3 mm unit is approximately 2.6 wt%, whereas a 4 mm / 0.76 mm / 4 mm unit approaches 3.9 wt% based on glass density 2.50 g/cm³ and PVB density 1.08 g/cm³ determined to ISO 1183-1. The production sequence on a standard laminating line includes conditioning R3 rolls at 18–22 °C and 20–30% RH for 24–48 h, lay-up in a 14–16 °C cleanroom to limit premature tacking, de-airing through nip rollers at 180–200 °C or vacuum bag at 0.09 MPa, autoclave exposure at 1.0–1.4 MPa and 130–140 °C with a soak of 30 min after the cold-spot glass thermocouple reaches 125 °C, and cooling under pressure to below 40 °C. Production-scale failures observed in this segment are predominantly edge-seal entrapment when the nip roller surface deviates more than ±5 °C from set point, and localised bubble clusters when interlayer moisture exceeds 0.45 wt%. Finished product types include point-fixed façade panels, sloped overhead glazing, glass canopies, structural glass fins, and walk-on skylights. Relative humidity in lay-up and storage zones should not exceed 60% for this application; heat-strengthened and aluminosilicate substrates require validation against edge pull-in caused by R3 shrinkage during autoclave heat-up.
| Application path | Conformance framework | Test method | Typical R3 interlayer construction | Interlayer mass fraction |
|---|---|---|---|---|
| Architectural point-fixed glazing | EN 14449 | EN 12600 | 3 mm / 0.38 mm R3 / 3 mm | 2.6 wt% |
| Overhead and balustrade glazing | EN 14449 | EN 12600 | 4 mm / 0.76 mm R3 / 4 mm | 3.9 wt% |
| Automotive windscreen | ECE R43 | ECE R43 Annex 3 | 2.1 mm / 0.76 mm R3 / 1.6 mm | 8.1 wt% |
| Security glazing | EN 356 | EN 12600 | 6 mm / 1.52 mm R3 / 6 mm | 5.2 wt% |
| Decorative partition | EN 14449 | EN ISO 12543-2 | 3 mm / 0.38 mm R3 / PET / 0.38 mm R3 / 3 mm | 5.0 wt% |
| Display-case glazing | EN 14449 | EN ISO 12543-2 | 2 mm / 0.38 mm R3 / 2 mm | 3.9 wt% |
Automotive laminated windscreen production using Trosifol R3 between a 2.1 mm outer glass and a 1.6 mm inner glass is evaluated against ECE R43 for type approval and ANSI Z26.1 for North American service. The interlayer ratio commonly specified is 0.76 mm, which produces a PVB mass fraction of approximately 8.1 wt% in the final glazing based on PVB density 1.08 g/cm³; this configuration must pass ball-drop and head-form impact tests, optical transmissibility requirements, and environmental resistance after oven cycling. The downstream process begins with matched sag-bent glass pairs whose curvature form is verified against a reference template, followed by R3 conditioning at 18–22 °C and 20–30% RH, lay-up with 3–5 mm interlayer overhang, de-airing through vacuum channels at 0.08–0.09 MPa, and autoclave loading at 1.4 MPa and 135–140 °C for 60 min after the glass reaches 125 °C. A production bottleneck observed on vacuum-bag automotive lines is residual air entrapped in the shadow area of ceramic enamel bands when the enamel edge step exceeds 0.3 mm; post-autoclave adhesion verification on the 0.76 mm R3 interlayer typically relies on glass scattering impact evaluation rather than separate peel testing. Finished products are windshield assemblies, laminated side glazing, and panoramic sunroof panels, with ECE R43 marking applied to the glazing edge. The use of R3 does not permit omission of the 60 min autoclave soak for 2.1 mm/1.6 mm curved laminates because R3 retains the same viscosity-temperature profile as standard PVB; published data for this specific configuration is limited for curved windshields below 1.0 m bending radius.
| Application path | Cold-spot glass temperature trigger | Autoclave pressure | Soak time after cold-spot trigger | Cool-down termination |
|---|---|---|---|---|
| Architectural single-ply R3 | 125 °C | 1.0–1.4 MPa | 30 min | <40 °C |
| Automotive curved windscreen R3 | 125 °C | 1.4 MPa | 60 min | <40 °C |
| Security multi-ply R3 | 125 °C | 1.0–1.4 MPa | 45–60 min | <40 °C |
| Decorative PET insert R3 | 125 °C | 1.0 MPa | 30 min | <40 °C |
| Display-case R3 | 125 °C | 1.0–1.2 MPa | 30 min | <40 °C |
For security glazing classified under EN 356 against manual attack, the number of Trosifol R3 plies and the total interlayer thickness dominate energy absorption after glass fracture. A 6 mm / 1.52 mm R3 / 6 mm laminate has an interlayer mass fraction of approximately 5.2 wt%, whereas a 6 mm / four × 0.38 mm R3 / 6 mm construction reaches approximately 9.9 wt%, assuming the same density values; ply count selection is therefore tied to the required EN 356 resistance class rather than a fixed single-ply recipe. The downstream process for multi-ply security laminates requires interleaving R3 plies with glass and using edge de-airing channels or mesh strips to allow gas evacuation from thick interlayer stacks; vacuum bag de-airing at 0.09 MPa is followed by autoclave staging with a slower thermal ramp than architectural single-ply work, then a hold at 1.0–1.4 MPa and 130–138 °C for 45–60 min after the centre of the thickest glass reaches 125 °C. Production-scale troubleshooting in this segment centres on centre-to-edge bubble migration in stacks above 3.0 mm total PVB thickness and on glass breakage caused by pressure differentials when de-airing channels collapse prematurely. Finished product types include bank teller screens, high-security storefronts, detention facility glazing, and glazed partitions in embassies, with EN 356 marking and factory documentation required.
Digital-printed PET inserts laminated into interior partition panels require a glass / R3 / printed PET / R3 / glass stack with Trosifol R3 as the bonding interlayer on both sides of the insert. Compliance with the optical defect limits of EN ISO 12543-2 and the safety-glass conformity framework of EN 14449 is mandatory; the addition ratio is two × 0.38 mm R3 plies on either side of a 230 μm PET insert, yielding an R3 mass fraction of approximately 5.0 wt% in a 3 mm glass / 0.38 mm R3 / PET / 0.38 mm R3 / 3 mm unit. The downstream process includes pre-baking printed PET at 60–70 °C for 120 min to reduce solvent retention, lay-up at 14–16 °C, vacuum bag de-airing at 0.09 MPa, and autoclave bonding at 1.0 MPa and 130 °C for 30 min after cold-spot temperature reaches 125 °C. Terminal finished products are office partition walls, elevator cabin panels, backlit feature walls, and shower enclosure glass. The main operational boundary is thermal shrinkage of the PET insert above 120 °C, which can cause edge delamination if the printed film is not restrained during autoclave cool-down; published data for residual solvent thresholds in this specific printed-PET/R3 stack is limited, therefore the pre-baking step is treated as the standard corrective control on production lines.
Because ultraviolet filtration below 380 nm is required for display-case and museum glazing, Trosifol R3 is specified where the interlayer blocks UV wavelengths while maintaining visible light transmittance above 89% after lamination. Compliance is demonstrated through the optical quality clauses of EN ISO 12543-2 and the safety-glazing conformity framework of EN 14449, with optional ISO 9050 solar transmittance calculations for light exposure budgeting. The addition ratio is a single 0.38 mm R3 ply between two 2 mm glass panes, giving an interlayer mass fraction of approximately 3.9 wt%; thicker 0.76 mm R3 is used where additional UV-blocking mass or impact resistance is required without altering glass thickness. The downstream process follows architectural lamination practice: glass washing and drying, R3 conditioning at 18–22 °C and 20–30% RH, de-airing, autoclave exposure at 130–140 °C and 1.0–1.2 MPa, and slow cool-down to below 40 °C. Finished product types include museum display vitrines, archival glazing, art frame glazing, and UV-sensitive retail cases. The operational boundary is that R3 is not a substitute for coated low-emissivity glass in thermal load reduction; it addresses UV filtration but not solar heat gain control.
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Trosifol R3 is a polyvinyl butyral interlayer for laminated safety glass manufactured by Kuraray within the Trosifol product family. The grade is supplied in standard PVB sheet thicknesses of 0.38 mm, 0.76 mm, 1.14 mm, and 1.52 mm, with roll widths up to 3,210 mm. The interlayer is produced under an ISCC PLUS mass-balance-certified feedstock route rather than a conventional fossil-only PVB synthesis route. This route changes the attributed feedstock burden but not the base polymer architecture. The density is approximately 1.07 g/cm³, and the glass transition temperature falls in the region of 27–30 °C. For product-specific mechanical values, the current Trosifol R3 datasheet should be used. The interlayer itself cannot be certified as safety glass; the completed laminated assembly must be qualified under EN 14449, ANSI Z97.1, or CPSC 16 CFR 1201.
Because the R3 designation concerns the production pathway rather than a change in the polyvinyl butyral chain, the product is positioned for conventional architectural safety glass applications. It is not a structural interlayer and does not provide the acoustic damping of multilayered acoustic PVB grades. The primary comparison is with standard clear Trosifol PVB. The key difference is the reduced cradle-to-gate carbon footprint attributed to mass-balance-certified feedstock. Published product carbon footprint values follow ISO 14040/14044 and are documented in the manufacturer’s life cycle assessment. The percentage reduction relative to fossil-based PVB depends on the allocation method, plant energy mix, and production site; current site-specific values should be verified from the product carbon footprint declaration.
The grade is not formulated as a fire-resistant interlayer. Projects requiring integrity and insulation classifications under EN 1365-2 or EN 13501-2 must use a tested fire-resistant glass system, not an interlayer substitution. Likewise, the material is not intended for use as a single-ply security glazing product; security performance is a glass-system property tested under EN 356 or equivalent project standards.
For specification screening, R3 occupies the conventional safety-glass position. It is not formulated to match the acoustic loss factor of Trosifol Sound Control. Acoustic specifications requiring a loss factor above 0.2 measured according to ISO 16940 should use the acoustic grade. For structural balustrades, overhead glazing, or hurricane-rated fenestration, a high-modulus interlayer such as SentryGlas SG5000 should be evaluated instead. The structural interlayer is specified for post-breakage residual load capacity and deflection control at the glass-system level, whereas R3 is specified for impact retention and fragmentation control under EN 12600.
Compared with ethylene vinyl acetate interlayers, Trosifol R3 requires autoclave lamination rather than oven-only vacuum processing. Compared with cast-in-place liquid resins, the sheet format provides controlled thickness tolerance and avoids on-site polymerization. In all cases, edge adhesion to glass must be verified according to EN ISO 12543-4, because interlayer adhesion is a system property that varies with glass type, wash-water quality, and edge sealant interaction.
The selection of R3 instead of standard clear PVB does not relax any process tolerance. Batch-to-batch viscosity, sheet roughness, and moisture content remain within the same control limits as conventional architectural PVB. Interlayer thickness tolerance is specified by ISO 12543-2; thickness variations outside this envelope can produce local stress concentrations and visual distortion.
Moisture control is the critical processing variable for Trosifol R3. As delivered, the interlayer is packaged in moisture-barrier bags. The layup room should be maintained at 18–25 °C and 20–60 % relative humidity. Rolls should be unrolled only after temperature equilibration, typically 24–48 h after transfer from cold storage. If the ambient relative humidity exceeds 60 %, pre-drying is required at 60–65 °C in a forced-air oven for 4–12 h, with stack height limited to allow air circulation. Moisture content before layup should remain between 0.30 wt% and 0.60 wt% as measured by a calibrated moisture analyzer.
On production-scale lines, the principal failure mode associated with moisture regain is edge bubbling after autoclave. This defect is not corrected by extending the autoclave dwell time; the interlayer must be re-dried and the layup repeated. Excessively dry conditions below 15 % relative humidity can create static charge and increase dust pickup. Static dissipators and controlled wash-water conductivity are used to reduce contaminant adhesion.
PVB interlayers are intentionally embossed to permit air evacuation from the glass–interlayer interface. If the embossed surface is flattened by blocking during improper storage, de-airing can fail and produce large-area air pockets. Rolls should be stored upright on their cores and kept sealed in the original moisture-barrier packaging until the layup room is ready.
During vacuum bagging, applied vacuum is commonly in the range of -0.8 bar to -0.95 bar relative to atmosphere for equipment-specific hold durations. With nip-roller lines, glass preheat temperature is set according to the equipment manufacturer; architectural lines often operate below automotive windshield temperatures. Edge seal quality after de-airing is evaluated visually for absence of air streaks and for uniform tack at the glass edge.
The lamination cycle itself is standard for architectural PVB. Glass and interlayer assemblies are de-aired by vacuum bag or nip-roller, then processed in an autoclave at 1.0–1.5 MPa and 135–140 °C for 60–120 min depending on glass size, thickness, and heat-transfer lag. Pressure and temperature ramp rates should follow the equipment manufacturer’s cycle qualification. Thicker glass packages and multiple interlayer stacks require longer soak times to reach the glass core temperature. Edge squeeze-out should be monitored; excessive squeeze-out indicates over-compression or excessive temperature, whereas insufficient edge flow may indicate low temperature or inadequate pressure.
Adhesion of the interlayer to glass is primarily governed by the glass surface condition. Glass edges should be seamed or polished to remove shelling and vents. Thermal stress around edge defects can initiate cracks during the autoclave heat-up phase. Glass washing must use deionized water with controlled conductivity; if the conductivity exceeds the glass manufacturer’s limit, the silanol bonding surface can be contaminated by residual salts and the adhesive bond will shift unpredictably. Peel adhesion is verified on samples using EN ISO 12543-4, with pass/fail criteria established for the specific glass configuration and safety performance class.
De-airing failures often appear as cloudy or white fingers extending from the edge. These defects are usually caused by insufficient vacuum, loss of surface roughness, or premature sealing of the edge before air can escape. Raising autoclave pressure alone does not reliably remove trapped air if the edge has sealed; the assembly should be re-bagged and de-aired, or the interlayer conditioned again.
After autoclave cooling, the laminate should not be subjected to edge trimming or seaming below the interlayer edge line in a way that exposes the interlayer to standing water. Exposed PVB edges are hygroscopic; edge sealants or structural silicone joints protect against moisture ingress. Compatibility of the edge sealant with PVB must be confirmed, because acidic release from some sealants can cause local edge degradation over time.
| Parameter | Typical range | Monitoring method |
|---|---|---|
| Layup room temperature | 18–25 °C | calibrated data logger |
| Layup room relative humidity | 20–60 % | calibrated hygrometer |
| Interlayer moisture content before layup | 0.30–0.60 wt% | thermogravimetric moisture analyzer |
| Pre-drying temperature | 60–65 °C | forced-air oven controller |
| Pre-drying duration | 4–12 h | batch log |
| Autoclave pressure | 1.0–1.5 MPa | pressure transducer |
| Autoclave temperature | 135–140 °C | thermocouple |
| Autoclave hold time | 60–120 min | cycle recorder |
Trosifol R3 is intended for projects that require material-level sustainability documentation. The ISCC PLUS certification provides mass-balance traceability for bio-circular or circular feedstocks. For construction product declarations, the interlayer supplier can provide cradle-to-gate data according to EN 15804+A2, with the production stage reported as modules A1–A3. Carbon footprint quantification should follow ISO 14067. The global warming potential of standard PVB varies with plant energy mix and plasticizer source; therefore, numeric comparisons between R3 and other interlayers must use the same system boundary and allocation method. Published data for this specific configuration may be limited to supplier environmental product declarations; independent verification should be requested when the project uses a third-party green building certification.
The mass-balance route under ISCC PLUS is a supply-chain mechanism. It does not imply that every molecule in the sheet is bio-based or recycled; rather, the certified proportion of feedstock is assigned to the product according to the scheme’s rules. If project specifications require a recycled-content claim under ISO 14021, the claim must be supported separately. The distinction between bio-circular, circular, and bio-renewable feedstocks should be stated in the supplier declaration.
Material compliance documentation includes REACH Regulation EC 1907/2006 and RoHS Directive 2011/65/EU. These do not change with the mass-balance route, but the mass-balance certificate should be checked for the specific production site and grade. The interlayer is not intended as a barrier layer for blast-resistant glazing, nor is it a replacement for a structural ionoplast in point-supported glazing.
| Document or standard | Relevant scope | Reference point |
|---|---|---|
| ISO 12543-2 | PVB interlayer defect limits and dimensional requirements | material specification |
| EN ISO 12543-4 | adhesion to glass | material testing |
| EN 12600 | pendulum impact performance | laminated glass system |
| EN 14449 | laminated safety glass classification | glass system |
| ANSI Z97.1 | safety glazing materials | glass system |
| CPSC 16 CFR 1201 | architectural safety glazing | glass system |
| REACH EC 1907/2006 | SVHC and restriction compliance | material substance |
| RoHS 2011/65/EU | restricted substances | material substance |
| ISCC PLUS | mass-balance traceability | production site |
| ISO 14067 | carbon footprint quantification | product-level declaration |
Trosifol R3 is used in facade glazing where safety-glass certification under EN 12600 is required and where project sustainability credits are tied to lower embodied carbon. It is also used in interior partitions, spandrel panels, and balustrades where standard PVB performance is adequate. In facade applications, the glazing system is tested with the exact glass make-up, including low-emissivity coatings and heat-treatment state. The interlayer supplier cannot provide a blanket system classification. For spandrel panels with printed glass, ink adhesion and outgassing during autoclave must be checked with the glass supplier. For interior partitions, the relevant standard is EN 12600 or the regional equivalent; fire and acoustic performance are separate system tests. Automotive applications are not automatically covered by architectural certification; windshield homologation under ECE R43 requires glass-system testing and separate material validation. Published data for R3 in automotive configurations is limited; qualification is conducted at the laminate level by the glass laminator.
