| HS Code | 821369 |
| Density | 1.07 g/cm³ |
| Refractive Index | 1.49 |
| Glass Transition Temperature | -18 °C |
| Tensile Strength | approx. 28 MPa at break |
| Elongation At Break | approx. 250% |
| Youngs Modulus | approx. 15 MPa at 20 °C |
| Tear Resistance | high |
| Visible Light Transmission | approx. 90% for clear film |
| Haze | <1% |
| Service Temperature Range | -20 °C to +70 °C |
| Thickness Range | 0.38 to 1.52 mm |
As an accredited Trosifol HR factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol HR is supplied in sealed, moisture-proof foil rolls, packed in cartons; each carton holds approximately 25 kg. |
| Container Loading (20′ FCL) | Trosifol HR film packed in export cartons, palletized and secured, loaded into a 20-foot FCL container for safe transport. |
| Shipping | Trosifol HR ships as rolled interlayer film on spools, wrapped in moisture-barrier packaging to prevent humidity damage. Keep upright, dry, and away from heat sources. Not classified as dangerous goods, but protect edges from impact. Store at moderate temperature and handle with care. |
| Storage | Store Trosifol HR in its original, sealed packaging in a cool, dry environment, ideally at 10–20°C. Avoid exposure to direct sunlight, moisture, and humidity, as these can affect performance. Keep rolls flat or upright as recommended, away from heat sources. Use within shelf life to ensure optimal quality. |
| Shelf Life | Shelf life is typically 12 months from production when stored unopened, cool, dry, and protected from moisture. |
Where the glazing package must satisfy missile-impact level C in ASTM E1886-19 and the windborne-debris cyclic-pressure sequence in ASTM E1996, Trosifol HR is placed between two heat-strengthened or thermally tempered lites to produce a laminate with post-glass-breakage membrane capacity. The sheet is conditioned at 20 ± 2 °C and 45–55 % RH until moisture content falls in the 0.4–0.6 % range, then laid up on a tilting clean-room table with edge alignment held to ± 1.5 mm. De-airing passes through a calendering nip at 70–90 °C; laminates above 3 m² are then autoclaved at 1.1–1.3 MPa and 135–140 °C for 90–120 min. The edge bite in the frame is set to minimum 12 mm for tempered glass and 15 mm for heat-strengthened glass under ASTM E2431-12, and the wet-glaze EPDM wedge seal limits edge moisture ingress to below 0.5 mm migration in a 6-month shoreline fog test. The terminal product is a full-height exterior door insert or a fixed side lite in a curtain wall zone where the HR interlayer retains fractured glass shards during the dynamic flexure that follows a 2×4 timber missile strike.
Long-duration dead load deflection is the governing check for sloped and horizontal glazing, and the interlayer shear-transfer coefficient decides whether the laminate responds as a near-monolithic section or as two weakly coupled plies. In EN 16612:2019, the effective thickness for deflection is calculated using the shear modulus of the interlayer at the design temperature and load duration; for a Trosifol HR laminate with 0.76 mm interlayer at 30 °C, the shear-transfer family shifts upward relative to conventional PVB, allowing a thinner build-up only where the structural calculation uses the actual shear modulus rather than the zero-shear-transfer default. The production parameter that most affects this calculation is autoclave pressure uniformity; laminates autoclaved at 1.2 MPa ± 0.1 MPa and 138 °C ± 3 °C for 75 min produce a visually clear bond with no air pockets above 0.5 mm diameter when inspected under ASTM C1172-16. Batch-to-batch moisture in the HR sheet is held below 0.5 % before layup because residual moisture forms microbubbles at the glass–interlayer interface during the 110–130 °C pre-press heating ramp. The finished skylight is typically an 8 mm heat-strengthened glass / 1.52 mm Trosifol HR / 8 mm heat-strengthened glass panel sealed with a moisture-cured silicone edge seal of ± 25 % movement capability; exposed PVB edges receive a UV-curable polyester edge seal to prevent delamination under ASTM G154 cycle 1 after 3000 h. Published data for the exact shear modulus of Trosifol HR under EN 16612 load durations beyond 50 years is limited, so long-duration creep verification is performed by project-specific tensile creep testing at the maximum design temperature, not by extrapolating short-term curves.
| Application | Mechanical load standard | Impact / retention standard | Durability / edge condition |
|---|---|---|---|
| Hurricane-impact facade | ASTM E1996 | ASTM E1886-19 | ASTM E2431-12 |
| Overhead glazing | EN 16612:2019 / EN 1991-1-1 | EN 12600:2002 | ASTM G154 |
| Glass floor | EN 1991-1-1 | EN 12600:2002 class 1B1 | ISO 12543-4:2021 |
| Point-fixed balustrade | EN 16612:2019 | CAN/CGSB 12.20-M89 | Polariscope ring limit 12 mm |
| Glass fin | EN 16612:2019 | Bracket clearance + 2 mm | EPDM isolator Shore A 70 ± 5 |
| Marine glazing | ISO 21005:2021 | IMO FTP Code Part 2 | ISO 9227 |
Under crowd loading of 5.0 kN/m² specified in EN 1991-1-1, glass floor panels require a laminate that retains residual load-carrying ability after one ply fractures. Trosifol HR is used in a three-ply layup of 10 mm tempered glass top, 0.76 mm HR, 10 mm tempered glass middle, 0.76 mm HR, and 10 mm tempered glass bottom, so that the panel remains in place under 3-second drop-hammer impact to EN 12600:2002 classification 1B1. The laminating line includes vacuum-bag de-airing at 0.2 MPa absolute pressure for 8–12 min before a nipper pass, followed by autoclave at 13 bar and 139 °C for 90 min; the heating ramp is limited to 3 °C/min to avoid temporary stress cracking in the tempered glass. Slip resistance of the top surface is obtained by a digital ceramic frit fired at 620–650 °C before lamination; the frit is oriented to the outside and never placed against the PVB, because accelerated ageing under ISO 12543-4:2021 shows that residual alkalis in the frit initiate edge delamination when the frit is in direct contact with the interlayer. The end product is a cantilevered stair tread with 25 mm bearing at each side and exposed edges polished to a 0.5 mm chamfer; post-lamination inspection under a 10× polariscope checks for stress rings greater than 12 mm radius around point supports.
Point fixings create local tensile stress concentrations at countersunk holes, so the interlayer must transfer shear into retained glass fragments after the ply cracks. Trosifol HR is placed between two 6 mm fully tempered lites in an outside setting-block arrangement, with hole diameter 30 mm and edge distance 80 mm under a 3.0 kN line load on the top rail. The laminate is de-aired in a horizontal vacuum bag at 0.09 MPa differential pressure, then autoclaved at 1.25 MPa and 137 °C for 75 min; the hole zone is reinforced by a 2 mm thick stainless steel insert bonded with structural silicone, not by drilling after lamination. Design verification is performed to EN 16612:2019 for deflection and to CAN/CGSB 12.20-M89 for post-breakage retention; the HR interlayer’s higher shear modulus reduces panel edge rotation at point supports relative to unmodified PVB, but published data for the specific hole-edge stress relaxation over 50 years remains limited. The terminal product is an interior atrium balustrade with glass infill panels of 1100 mm × 1800 mm and no top rail, where the HR interlayer carries the dead weight of broken tempered fragments at 45 °C without tearing away from the metal fixing.
Vertical glass fin systems increase flexural stiffness by laminating two glass plies with a shear-coupling interlayer. A typical build-up is 12 mm heat-strengthened glass / 1.52 mm Trosifol HR / 12 mm heat-strengthened glass, with the fin edge restrained at top and bottom by shoe brackets at 400 mm centres. The laminating process uses a high-pressure autoclave cycle of 13 bar at 138 °C for 120 min, because the 12 mm glass plies reduce heat transfer into the interlayer and require a longer thermal soak than thinner laminates; the cooling stage includes a soak at 105 °C for 15 min to reduce residual interfacial stress. The design method assumes a shear-transfer coefficient between monolithic and layered behaviour; under short-duration wind gust loads the laminate effective thickness approaches the monolithic value, while under permanent self-weight the effective thickness is set by the interlayer creep modulus at 35 °C. Field data from vertical fin installations show the dominant failure mode is not interlayer delamination but glass fracture at the bracket bolt clearance, so the hole diameter tolerance is fixed at + 2 mm over the bolt shank and EPDM isolators of Shore A 70 ± 5 are mandatory. The terminal product is a 3.2 m-high glass fin supporting a point-fixed facade, designed for a 1.5 kN/m² wind load at 3-second gust.
Ship window and bridge glazing under ISO 21005:2021 requires fire-resistance and moisture-cycling performance in a single laminate. Trosifol HR is combined with chemically toughened borosilicate glass for the outer lite and a polycarbonate inner liner, with the HR film used only in the PVB-to-glass bond line; the layup is de-aired using a silicone vacuum ring at 0.085 MPa differential pressure for 10 min, then autoclaved at 1.15 MPa and 135 °C for 90 min. Exposed PVB edges are sealed with a two-part polysulfide sealant applied at a wet-film thickness of 0.5 mm, because salt-spray exposure to ISO 9227 causes edge delamination in unprotected PVB after 500 h. The end product is a rectangular wheelhouse window with bonded aluminum frame and a minimum 20 mm edge bite, tested to IMO FTP Code Part 2 for smoke and toxicity; published data for Trosifol HR under 10-day submersion at 40 °C is limited, so a factory delamination test per ISO 12543-4:2021 is specified for each batch.
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Trosifol HR is a high-rigidity polyvinyl butyral interlayer manufactured by Kuraray for laminated safety glass. It is supplied as an optically clear film specified for structural glazing, balustrades, overhead panels, stair treads, and glass flooring. The material differs from conventional plasticized PVB through a reduced plasticizer fraction, which raises tensile modulus and reduces viscoelastic creep. This architecture retains PVB edge adhesion and autoclave processability while increasing flexural coupling between glass plies under short-duration loads.
Published datasheet values for Trosifol HR give a density of 1.06–1.08 g/cm³ when tested to ISO 1183. Short-term tensile strength under ISO 527-3 is typically ≥22 MPa, elongation at break is ≥70%, and tensile modulus is ≥90 MPa at 23°C. The corresponding tensile modulus of conventional PVB interlayers is commonly reported in the 3–10 MPa range. The difference is therefore approximately one order of magnitude in short-term modulus, not a minor compounding variation.
Roll stock is available in nominal thicknesses of 0.76 mm and 1.52 mm, with slit widths up to 3,210 mm. Sealed packaging maintains residual moisture at 0.45 ± 0.15% by weight. In a cleanroom at 18–22°C and 20–40% RH, rolls may be stored for up to 12 months before use; opened rolls that remain outside conditioned storage for more than 8 h at >60% RH should be reconditioned for 24 h before layup. On high-speed automatic cutting lines, the film’s elevated modulus increases blade load relative to standard PVB. Production experience on lines running 800–1,200 m²/day shows that cutting force rises by 15–25%, and blade edge wear is accelerated unless carbide or ceramic-coated blades are used. These are not rheological extrapolations; they are recurring process adjustments observed on flat-glass laminating lines with PLC-controlled nip rollers.
The elevated modulus of Trosifol HR influences load-deflection calculations in laminated glass. Structural design standards ASTM E1300-23 and EN 16612:2019 allow interlayer properties to be considered only within defined limits; for laminate analysis the interlayer shear transfer coefficient must be determined under the relevant temperature and load duration. In framed balustrade panels with four-edge or two-edge support, substitution of Trosifol HR for standard PVB reduces centre-of-glass deflection and increases post-breakage load capacity under short-term uniform load. However, published load-test data for every combination of glass thickness, aspect ratio, and support condition is limited; finite element modeling with temperature-dependent interlayer master curves is therefore specified for project-specific design rather than extrapolation from single-panel tests.
For finite element input, Trosifol HR shear relaxation data are fitted with a generalized Maxwell model using Prony series coefficients. The shear modulus shifts with temperature following a Williams-Landel-Ferry equation; typical shift factors for PVB-based interlayers produce a glass transition at 20–30°C for conventional grades and 30–40°C for high-rigidity grades. This master curve is valid only within the measured frequency range; extrapolation beyond 50°C or below 0°C requires dynamic mechanical analysis on the specific film lot. A fixed shear transfer coefficient is not acceptable under EN 16612:2019 because the standard requires time- and temperature-dependent values for polymer interlayers.
| Property | Test method | Trosifol HR | Conventional PVB |
|---|---|---|---|
| Tensile strength | ISO 527-3 | ≥22 MPa | ≥20 MPa |
| Tensile modulus | ISO 527-3 | ≥90 MPa | 3–10 MPa |
| Elongation at break | ISO 527-3 | ≥70% | ≥200% |
| Tear strength | ISO 34-1 | ≥60 N/mm | 20–40 N/mm |
| Density | ISO 1183 | 1.06–1.08 g/cm³ | 1.05–1.10 g/cm³ |
The tabulated values are typical comparative values drawn from published product datasheets; they should not be used as design allowables because PVB mechanical response is nonlinear, temperature-dependent, and strain-rate-dependent. Finite element laminate analysis for Trosifol HR requires a shear-relaxation curve measured on the actual film batch. Design standards ASTM E1300-23 and EN 16612:2019 do not assign a fixed shear transfer coefficient to any interlayer; the coefficient must be selected from tabulated values or computed for the relevant glass geometry, load duration, and temperature.
For autoclave lamination of Trosifol HR, standard vacuum-bag or nip-roller preparation remains unchanged. The plateau is typically 135–140°C at 12–14 bar for 90–150 min, depending on glass configuration and package mass. The processing window is tighter than for standard PVB because the reduced plasticizer content raises melt viscosity; if edge temperature remains below 120°C during the pressure ramp, edge adhesion may peel below 6 N/mm² in a compressive shear test. Plateau temperatures above 145°C with pressures above 14 bar can produce edge extrusion and thickness loss at the glass perimeter. Laminators using 2.4 m × 4.8 m autoclave baskets should validate ramp rates not exceeding 1.5 bar/min until the glass surface reaches 120°C. Autoclave validation relies on thermocouples placed at the geometric centre of the glass pack, at the edge, and inside a dummy laminate. A lag between the glass surface and the interlayer of 10–15°C is typical during the first 30 min of heating; the soak time begins only when the interlayer thermocouple reaches 120°C, not when the autoclave atmosphere reaches plateau. Multi-layer packages with 4–6 mm tempered glass and ceramic frit edges require the upper half of the plateau temperature range to seal the edge, but low-E coated lites with emissivity below 0.05 may require additional soak time because the glass reflects infrared energy and slows interlayer heating.
Moisture uptake in Trosifol HR is operationally significant because the lower plasticizer fraction reduces the polymer’s capacity to absorb water without forming bubbles at the glass-interlayer interface. Unprotected film exposed to 60–70% RH for 12 h reaches moisture contents of 0.5–0.7%, a range that produces edge clouding and small bubbles after the autoclave cycle. The defect is most pronounced on low-E glass because the infrared-reflective coating reduces heating rate and shifts the temperature profile toward the edge. Pre-drying is therefore specified for any facility where the layup room exceeds 60% RH for more than 12 h. Conditioning at 18–22°C and 20–40% RH for 24–48 h returns the film to a processable moisture level. Forced-air drying at 25°C and 15% RH shortens reconditioning time but must not exceed 72 h because prolonged low-humidity exposure builds static charge and attracts airborne particulates. Static discharge bars with ionizing air are required on slitting and layup equipment when film moisture falls below 0.3%.
Edge deletion width must be validated by peel testing because the high-modulus interlayer exhibits less flow at the glass edge than standard PVB. Coated glass with ceramic frit and low-E edge areas typically requires edge deletion of 15–20 mm around the perimeter or at the sealant interface. For structural silicone bonding, the specified bite is governed by ASTM C1401 or ETAG 002; exposed PVB edge must not fall within the structural bite. Peel adhesion measured by compressive shear or floating roller peel according to ISO 11339 should exceed 6 N/mm at 23°C. Values below this threshold after autoclave indicate incomplete edge seal, moisture contamination, or inadequate glass cleaning.
Raw film is supplied with a haze value below 1.0% and a yellowness index below 1.5 when tested to ASTM D1003 and ASTM E313, respectively. Thickness tolerance for 0.76 mm film is ±0.05 mm; for 1.52 mm film the tolerance is ±0.08 mm. Width tolerances are ±10 mm on slit rolls. Long-term storage should avoid UV exposure because photodegradation of PVB forms carbonyl species and increases yellowness index above 1.5 measured to ASTM E313. The film must not be cleaned with ketones, esters, or chlorinated solvents; isopropanol wipes are used for edge cleaning. For laminated glass with printed ceramic or low-E coatings, edge deletion must remove all coating in the sealant contact zone; residual tin-side glass or silicone contaminants reduce peel adhesion and are common causes of delamination at the glass edge. The product is compatible with neutral-cure silicone sealants, but direct contact with amine-based joints should be avoided because amines attack PVB at the exposed edge and promote discoloration.
| Requirement | Standard designation | Evaluated property |
|---|---|---|
| Laminated safety glass interlayer | ISO 12543-2:2021 | Interlayer classification and lamination integrity |
| Safety glazing impact | EN 12600 | Pendulum impact classification |
| Load resistance of glass | ASTM E1300-23 | Deflection and stress calculation |
| Glass in building | EN 16612:2019 | Laminated glass calculation method |
| Optical transmittance | ASTM D1003 | Haze |
| Yellowness index | ASTM E313 | Discoloration |
In framed balustrade and point-fixed overhead applications, Trosifol HR is selected primarily where post-breakage residual load capacity or deflection control governs glass thickness. The stiffer interlayer increases composite bending stiffness under short-duration wind and impact loads, but thermal expansion and long-duration dead load still require a viscoelastic analysis. For point-fixed panels, local stress concentrations at bolt holes are controlled by glass strength, not interlayer stiffness; the interlayer cannot compensate for inadequate glass edge finish or excessive torque. In cantilevered glass fins, shear transfer across the laminated build is improved, but the interlayer does not eliminate the need for steel or glass supporting members. For chemical compatibility, sealant contact tests should follow ASTM C1087 or ASTM C1249; alkoxy-cured silicones generally display lower edge discoloration than acetoxy-cure systems. The interlayer is not compatible with solvent-borne glazing compounds containing xylene or toluene; exposure of the PVB edge to these solvents leads to plasticizer extraction and dimensional change.
Compared with ionoplast interlayers, such as SentryGlas, Trosifol HR has a lower tensile modulus and lower glass transition temperature, but it is processable on conventional PVB lines without the higher autoclave temperatures used for some ionoplast laminating. The PVB chemistry of Trosifol HR provides similar compatibility with acid-etched glass to other PVB grades, whereas ionoplast may require different storage and moisture control. Against high-adhesion PVB grades, the HR grade is not intended as the primary adhesion modifier; edge peel and sealant adhesion are controlled by the edge-deleted glass surface, acrylic or silicone primers, and neutral-cure sealants according to EN 15651 or ASTM C1184. Post-breakage capacity is evaluated according to EN 12600 pendulum impact classification, but structural residual capacity under two-edge support is project-specific. Tests on laminated glass specimens with Trosifol HR at 23°C show crack bridging and retained glass fragments at interlayer tear strains up to 50–100%. For blast or impact loads, the interlayer’s rate-dependent stiffness is higher than static values; however, published dynamic test data for Trosifol HR in blast-rated configurations remain limited.
For overhead glazing spanning 1.5–2.5 m between supports, substitution of Trosifol HR for standard PVB typically reduces centre-of-glass deflection by 10–30% under short-term uniform load when glass thickness and boundary conditions are held constant. The exact reduction depends on aspect ratio, support stiffness, and temperature; published data for every support geometry is limited. Below 10°C, the modulus of PVB-based interlayers increases, and deflection differences between HR and standard PVB narrow. Above 40°C, modulus decreases, and long-term coupling is lower than short-term coupling. For glass flooring and stair treads, only laminated glass configurations tested to EN 356, EN 12600, or applicable national safety glazing codes should be used; the interlayer itself cannot be certified as a structural element. Edge protection with U-profiles or frame rebates should provide continuous support because exposed PVB edges absorb moisture and can initiate local delamination at >80% RH.
