| HS Code | 110574 |
| Product Name | Trosifol Greys |
| Product Type | Polyvinyl butyral (PVB) interlayer for laminated glass |
| Color | Neutral grey shades |
| Available Shades | Multiple grey intensities from light to dark |
| Thickness | 0.38 mm, 0.76 mm, and 1.14 mm (nominal) |
| Visible Light Transmission | Varies by shade and thickness, approximately 10% to 75% |
| Uv Protection | Blocks more than 99% of UV radiation |
| Solar Control | Reduces solar heat gain in laminated glass |
| Glare Reduction | Reduces visible light transmittance to minimize glare |
| Optical Quality | Low haze and uniform color appearance |
| Adhesion To Glass | Strong and durable adhesion after autoclave lamination |
| Weathering Resistance | Resistant to ultraviolet-induced yellowing |
| Safety Glass Function | Enables glass to remain in place upon breakage when laminated |
As an accredited Trosifol Greys factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol Greys, a grey PVB interlayer, is supplied in sealed moisture-proof rolls, typically 50 m long and 1 m wide. |
| Container Loading (20′ FCL) | Trosifol Greys in 20′ FCL: packed rolls on pallets, secured against shifting, moisture-protected, edge-protected, weight-balanced for safe transit. |
| Shipping | Trosifol Greys ships as rolled PVB interlayer film on spools, protected with moisture-barrier packaging. Store upright in a cool, dry area between 5–30°C; avoid direct sunlight, moisture, and heavy pressure. Use covered, non-puncturing transport, and handle with clean, dry gloves to prevent surface contamination or damage. |
| Storage | Store Trosifol Greys in its original, unopened packaging in a cool, dry, clean environment, ideally at 5–30°C with relative humidity below 60%. Keep away from direct sunlight, heat sources, and moisture. Store rolls flat or in the recommended position, protect from dust and mechanical damage, and use within the specified shelf life. |
| Shelf Life | Store in original packaging, cool and dry. Shelf life is typically 12 months from date of delivery. |
In laminated architectural glazing, neutral grey PVB interlayers from the Trosifol Greys range are specified where solar control and visible light transmittance reduction are required without the angular colour shift of exterior reflective coatings. The interlayer is normally used at 0.76 mm or as a two-ply build of 1.52 mm between float glass panes of 4 mm to 12 mm. The relevant product standard for the finished laminate is EN ISO 12543-2, with safety-in-building verification under EN 14449; North American glazing may also follow ASTM C1172 and CPSC 16 CFR 1201. Glass is cut, edge-worked, and washed with demineralised water having a resistivity no lower than 10 MΩ·cm before layup; any residual cutting oil or cerium oxide from edge polishing reduces PVB adhesion at the periphery. The grey PVB sheet is conditioned at 18–22 °C and 25–35 % RH for at least 24 h; moisture content outside 0.30–0.50 % is a reject criterion because excess water migrates to the glass interface and forms edge bubbles during autoclave. Vacuum-bag layups are de-aired at 20–50 mbar for 20 min at 110–125 °C, then autoclaved at 135–140 °C and 12–14 bar for 60–90 min. The pigmented layer requires a narrower thermal envelope than clear PVB: multi-zone autoclave controllers typically set an alarm threshold of ±5 °C around the centreline temperature because excursions above 145 °C cause edge bleed and thinning, while temperatures below 130 °C produce incomplete edge seal and visible delamination. After autoclaving, the unit is cooled to ≤40 °C before edge trimming. When a low-emissivity coating is present, edge deletion of 10–15 mm around the perimeter prevents plasticiser attack and coating delamination. Edge sealant compatibility must be confirmed before structural sealant glazing; plasticiser migration from PVB can reduce adhesion of some low-modulus silicone formulations under EN 15434. End products include curtain wall vision panels, spandrel areas, balustrades, and overhead glazing where grey tint controls glare and solar gain without yielding the metallic appearance of reflective glass.
Where national type-approval regulations restrict visible light transmittance in forward vision glazing, grey PVB interlayers are confined to side and rear glazing positions. The typical layup uses a single 0.76 mm grey PVB sheet between two 2.1 mm or 3.2 mm bent glass plies. Compliance is demonstrated under ECE R43 for European type approval, FMVSS 205 with ANSI Z26.1 for North America, and GB 9656 for China. The optical quality requirements of ECE R43 Annex 3 apply to the finished laminated side and rear windows; grey interlayers must not introduce optical distortion beyond the specified zone limits. On an automotive roll-press laminating line, the glass-PVB-glass stack passes through a preheating nip at 120–130 °C surface temperature at a line speed of 2–4 m/min, followed by autoclave exposure at 140–145 °C and 12–14 bar for 45–60 min. The short cycle time is possible because single-ply automotive laminates contain less trapped air than multi-ply architectural units. Adhesion is checked on each glass lot by the pummel test; accepted values typically fall between 3 and 7 on the commonly used 0–10 scale. Lower values indicate insufficient impact retention, while higher values can reduce glass-to-rubber weathering resistance in the field. Tin-side and air-side glass surfaces must be oriented consistently because grey pigment particles change the hydrogen-bonding density at the interface. Moisture control is equally critical: film rolls are stored at 18–20 °C and 25–35 % RH, and cut sheets not used within 4 h of removal from the moisture-protective packaging are returned to conditioning storage. End products include privacy sidelites, dark rear windows, and sunroof panels where the grey tint reduces cabin heat load. Use of dark grey PVB in windscreens is excluded where visible light transmittance below 70 % does not satisfy type-approval requirements in the driver’s forward field of view.
Multi-ply security laminates built with grey PVB are processed under longer autoclave residence times than standard architectural laminates because each additional glass-interlayer interface must reach full melt flow without premature edge seal. A typical intrusion-delay layup consists of 4 mm glass / 0.76 mm grey PVB / 4 mm glass / 0.76 mm grey PVB / 4 mm glass, producing a total composite thickness of approximately 13.5 mm. The assembly is tested according to EN 356 classifications P1A through P5A or UL 972 in the North American burglary-resistance category. De-airing is performed in a vacuum-bag system at ≤30 mbar for 45 min with a preheat ramp to 120 °C, because multi-ply stacks retain air along the edges and at interlayer overlaps. Autoclave settings are held at 130–135 °C and 12–13 bar for 90–120 min. The lower autoclave temperature relative to architectural single-ply processing is deliberate; longer soak at lower temperature improves interfacial adhesion without causing excessive glass deflection in thick stacks. Published data for Trosifol Greys-specific impact energy dissipation in multi-ply systems is limited; the controlling verification therefore remains destructive drop-ball testing under EN 12600 or ANSI Z97.1 on the finished laminate. Direct lamination of polycarbonate to PVB without a polyurethane adhesive interlayer is not recommended for security grades because interfacial adhesion variability produces premature delamination under repeated impact. End products include bank counters, ground-level façade panels, retail security screens, and detention facility glazing where neutral grey appearance is required. The edge condition of security laminates is also different from architectural units: exposed PVB edges must be sealed against moisture ingestion with polysulfide or structural silicone, and unsealed edges exposed to RH > 80 % for more than 72 h may show localised delamination at the cut edge.
Marine certification introduces edge durability requirements that are absent from terrestrial architectural specifications; lamination of grey PVB into porthole and bridge windows therefore follows a modified de-airing and sealing sequence. A standard marine layup may combine 4 mm heat-strengthened glass, 0.76 mm grey PVB, and 4 mm heat-strengthened glass, with thicker interlayers of 1.52 mm used where impact resistance is specified by classification society rules. The finished pane is evaluated under ISO 614 for toughened safety glass panes for marine windows and under the applicable rules of DNV or Lloyd’s Register. Marine processing differs in the cooling phase: autoclave temperature is held at 135–140 °C and 12–13 bar for 75–90 min, then cooled at a controlled rate to ≤35 °C before pressure release to avoid thermal stress in the thick glass stack. The edge seal is applied within 24 h of autoclave removal using a moisture-cure polyurethane or polysulfide; edge profile must be designed to prevent standing water because grey PVB absorbs moisture at exposed cut edges and forms a white haze at relative humidity above 85 % within 48–72 h in tropical marine environments. Terminal products include yacht side windows, bridge deck windows, and door vision ports where grey tint reduces glare on instruments without resorting to externally mounted reflective films that degrade under salt spray. The incompatibility of grey PVB with some solvent-based sealants is a known process constraint; sealant primers containing high levels of ketones or esters should be avoided because they attack the PVB edge and cause local softening.
Table 1 lists representative PVB lamination conditions reported on production-scale lines for the architectural, automotive, security, and marine categories described above. Grey pigmented interlayers are processed within these envelopes, but batch-specific adjustments follow the supplier’s certificate and incoming film moisture data.
| Segment | De-airing | Autoclave temperature | Autoclave pressure | Soak time | Cooling exit threshold |
|---|---|---|---|---|---|
| Architectural facade | 20–50 mbar, 110–125 °C, 20 min | 135–140 °C | 12–14 bar | 60–90 min | ≤40 °C |
| Automotive side/rear | roll press 120–130 °C | 140–145 °C | 12–14 bar | 45–60 min | ≤40 °C |
| Security multi-ply | ≤30 mbar, 120 °C, 45 min | 130–135 °C | 12–13 bar | 90–120 min | ≤40 °C |
| Marine glazing | 20–50 mbar, 110–125 °C, 30 min | 135–140 °C | 12–13 bar | 75–90 min | ≤35 °C |
Railway vehicle side windows produced with grey PVB interlayers are validated against fire propagation and smoke release criteria before optical or impact performance is considered. The standard layup frequently pairs 4 mm chemically toughened aluminosilicate glass, 0.76 mm grey PVB, and 4 mm heat-strengthened soda-lime glass to achieve impact performance while controlling weight. The critical compliance path is EN 45545-2 for fire protection of railway vehicles; grey PVB contributes to the organic fire load of the laminate, so material selection must be confirmed by component-level smoke density and toxicity testing under the relevant EN ISO 5659-2 and EN 17084 methods. Lamination parameters follow the architectural PVB envelope: de-airing at 20–50 mbar and 110–125 °C for 25 min, autoclave at 135–140 °C and 12–14 bar for 60–90 min. The chemically toughened aluminosilicate layer imposes an upper autoclave temperature limit of 140 °C; extended exposure above this value can reduce surface compressive stress. The edge finish is often left unsealed inside a mechanical frame, but exposed edges in areas subject to washing with alkaline detergents are sealed with a neutral silicone to prevent plasticiser extraction. Published data for the specific smoke density contribution of Trosifol Greys in multi-material railway window assemblies is limited; suppliers of complete window systems normally perform batch-specific fire testing because the thickness of adjacent sealants and gaskets changes the final classification. End products include high-speed train side windows, metro door windows, and driver cabin side screens where the grey tint reduces glare without a separate mesh or coating. If the required fire hazard level exceeds the capability of standard PVB, the grey interlayer is replaced or supplemented by an intumescent or ionomer sheet, and the lamination cycle is adjusted accordingly.
In museum and conservation glazing, the ultraviolet absorption of grey PVB is measured by spectral transmittance according to EN 410 rather than inferred from colour alone. A typical vitrine layup uses two plies of 2–3 mm low-iron glass with a 0.76 mm grey PVB interlayer. The interlayer attenuates UV radiation in the 280–380 nm band to below 1 % transmittance in standard PVB formulations; the grey tint adds a fixed reduction in visible light transmittance that must be balanced against exhibition lighting design criteria. Haze below 1.5 % measured per ASTM D1003 is a release criterion for museum laminates because grey PVB can show scattering from pigment agglomerates if film was stored at high humidity. Autoclave processing for museum units is identical to architectural processing, but optical quality requirements are stricter: the finished laminate is inspected in transmission against a black background for haze, inclusions, and streaking before release to the frame shop. The grey layer reduces all visible wavelengths nearly uniformly, but a spectrophotometric curve per EN 410 is required to calculate the resulting colour rendering index of the display lighting system. PVB plasticisers can migrate over long contact durations with certain conservation-grade sealants and painted surfaces; a neutral-cure silicone edge seal or mechanical frame isolation is therefore specified to prevent surface contamination. Published data for Trosifol Greys-specific long-term photostability in uncontrolled gallery environments is limited; accelerated weathering under EN ISO 12543-4 is normally performed on the finished laminate before installation. End products include display vitrines, archival framing glazing, and protective glazing for light-sensitive materials where both UV attenuation and glare reduction are required.
Table 2 summarises the primary compliance matrix for grey PVB laminated glass by end-use. Where regional deviations exist, the most restrictive standard governs the production lot.
| End-use | Primary product standard | Performance verification | Critical parameter |
|---|---|---|---|
| Architectural glazing | EN ISO 12543-2 | EN 14449, EN 12600 | visible transmittance per EN 410 |
| Automotive side/rear | ECE R43 | FMVSS 205, ANSI Z26.1 | optical distortion and fracture |
| Security glazing | EN 356 | UL 972 | drop-ball classification |
| Marine glazing | ISO 614 | DNV/Lloyd’s Register rules | edge durability and impact |
| Railway glazing | EN 15152 | EN 45545-2 | smoke density Ds(max) |
| Museum vitrine | EN ISO 12543-2 | EN 410 | UV transmittance 280–380 nm |
| BIPV module border | IEC 61215 | IEC 61730 | damp heat 1000 h |
When building-integrated photovoltaic modules adopt glass-glass construction, grey PVB appears only in non-active edge and spandrel zones because its tinted formulation reduces irradiance reaching the cell surface. The active string area is laminated with a clear PVB or ionomer encapsulant of 0.76 mm, while grey PVB of the same thickness is used in the surrounding inactive border to create a uniform exterior colour and hide busbars and junction boxes. Module safety qualification follows IEC 61215 and IEC 61730, with the grey PVB-containing border evaluated for the same damp heat, humidity-freeze, and thermal cycling sequences as the active area. The lamination process for glass-glass BIPV modules is a single-chamber vacuum laminator operating at 145–150 °C with an initial evacuation phase below 5 mbar, followed by a press phase under atmospheric pressure for 30–45 min and controlled cooling to ≤60 °C before edge trimming. A process conflict arises because grey PVB has lower visible transmittance and may absorb more infrared during lamination than clear PVB, creating a local heat differential across the border interface. Multi-zone laminator heating plates must be balanced within ±3 °C to avoid edge delamination at the transition between clear and grey PVB. Published data for Trosifol Greys-specific electrical isolation resistance and long-term adhesion to backsheet glass in PV modules is limited; module manufacturers therefore qualify the complete stack according to the specific BIPV product certification rather than relying on interlayer datasheets alone. End products include spandrel BIPV panels, coloured facade modules, and opaque roof glazing where the grey border matches the active cell area without the use of painted ceramic frit.
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The product Trosifol Greys comprises a family of grey-tinted polyvinyl butyral interlayers supplied by Kuraray for laminated safety glass. The base resin is plasticized PVB with a nominal density of approximately 1.07 g/cm³; standard commercial plies are available in 0.38 mm, 0.76 mm, 1.14 mm, and 1.52 mm thicknesses, and multiple plies are assembled to produce thicker interlayer packs. The grey colorant is dispersed within the PVB matrix so that the interlayer functions simultaneously as a glass-bonding layer and as an absorption-based solar-optical filter. This distinguishes the material from clear PVB, which provides negligible visible-spectrum attenuation. Because the tint operates by absorbing solar radiation, laminated assemblies made with Trosifol Greys exhibit lower luminous transmittance and lower total solar energy transmittance than the same glass build-up with clear PVB. The absorbed energy is not neutralised; it is converted to heat and conducted into the glass plies or re-radiated. The exact optical values are grade-dependent; no single set of spectral data can be assigned to the entire Greys range. Design values are therefore calculated under EN 410 and ISO 9050 using the measured spectral properties of the actual glass configuration. The product is specified in architectural facades, sloped glazing, spandrel zones, interior partitions, doors, and transport glazing where a neutral grey appearance, solar control, and retained laminated safety function are required. Regional product designations and tint-intensity codes vary; published data for the precise optical loading of individual grey grades is limited outside the manufacturer technical datasheet.
At the interlayer chemistry scale, the grey pigmentation is primarily a radiation-absorbing modification; it does not displace the hydroxyl-functionalised PVB resin that is responsible for adhesion to the glass surface. The plasticizer level remains in the same processing class as general-purpose PVB, and the glass transition temperature therefore remains within the typical PVB range of 15 °C to 30 °C. Lamination line setpoints for clear PVB are therefore a starting point for Trosifol Greys, but they are not necessarily a finished process. The principal differences from clear PVB are optical: grey grades attenuate the visible and near-infrared portions of the solar spectrum more strongly, which lowers the g-value of the assembly and increases the absorption-derived thermal load in the glass plies. The change is not equivalent to a neutral-density filter alone because the spectral transmittance curve of the tint is wavelength-dependent; colour rendering under transmitted daylight must be verified when interior visual tasks are colour-critical.
Compared with structural ionoplast interlayers, Trosifol Greys does not provide the same post-breakage stiffness or creep resistance. Ionoplast interlayers are typically specified when the laminate must retain stiffness after glass fracture or when bolt-bearing loads are transferred through the interlayer. Trosifol Greys belongs to the standard PVB class and therefore has a lower tensile modulus and greater plasticizer-related viscoelastic response. It should not be substituted into a structural ionoplast design without recalculation of load resistance and post-breakage deflection under the relevant standard, such as EN 16612 or ASTM E1300. Compared with tinted EVA interlayers, PVB-based Trosifol Greys requires more severe moisture control and autoclave-assisted processing; EVA is often processed in vacuum-bag ovens. This is an operational boundary, not a performance advantage in all cases.
| Property or requirement | Standard or test method | Relevance to Trosifol Greys |
|---|---|---|
| Luminous and solar characteristics | EN 410 / ISO 9050 | Grade-dependent; use measured spectral data of actual glass build-up. |
| UV transmittance | ISO 9050 | PVB matrix blocks most UV below 380 nm; tint modifies visible and near-infrared response. |
| Pendulum impact | EN 12600 | Assembly classification, not an interlayer-only property. |
| Safety glazing | ANSI Z97.1 / CPSC 16 CFR 1201 | Qualification depends on laminate construction and test. |
| Moisture content | ASTM D6869 | Target 0.35 wt% to 0.45 wt% before layup. |
| Thermal stress | ASTM E2431 / DIN 18008 | Required for grey-tinted high-absorption laminates. |
| Load resistance | EN 16612 / ASTM E1300 | Needed when replacing structural interlayer or establishing design load. |
Within the broader Trosifol Colours range, the grey family is selected when the specification requires a neutral transmitted colour rather than a bronze, green, or blue chromatic shift. The neutrality is not perfect across the spectrum; the measured a* and b* colour coordinates shift with interlayer thickness and glass substrate. Spectrophotometric measurement of the complete laminate is required because visual comparison of the PVB sheet alone is insufficient. Low-iron glass, standard clear float, tinted float, and coated glass all alter the final chromaticity and spectral power distribution differently. The architect or specifier should evaluate a full-size laminate mock-up, not the interlayer film.
On a production laminating line, Trosifol Greys is processed in roll form for high-volume straight-line layup or in cut-sheet form for short-run architectural work. Roll storage orientation should remain horizontal to prevent edge compression set; cut sheets should be kept in sealed polyethylene packaging until the moment of layup because PVB absorbs atmospheric moisture rapidly. If packaging is opened at high relative humidity, edge blocking can occur. Grey grades can also absorb more radiant energy than clear PVB if stored near direct sunlight or high-intensity lighting, producing local heating. A cold storage room maintained at 5 °C to 10 °C extends shelf life but requires reconditioning before layup because the film becomes stiff and dimensionally unstable at low temperature. Slitting after cold storage without temperature equilibration can introduce edge stress and wavy edges that later produce lamination defects.
Pre-lamination conditioning is the dominant process variable for Trosifol Greys. The interlayer should be stored and conditioned in a controlled environment at 10 °C to 20 °C and 35% to 65% relative humidity. The target moisture content before layup is 0.35 wt% to 0.45 wt%. If the material has been exposed to ambient relative humidity above 60%, reconditioning for 24 h to 48 h at low humidity is recommended before lamination. The transition is abrupt: moisture contents above approximately 0.5 wt% commonly produce edge bubbles and optical haze at the glass-PVB interface because water volatilises during autoclave heating and cannot escape through the sealed edge. This is a critical threshold risk, not a linear degradation curve. On production lines using vacuum-bag or nip-roller de-airing, grey-tinted PVB may heat more rapidly than clear PVB under infrared preheating because the tint increases absorption of radiant energy. Field observations on industrial laminating lines indicate that the same infrared emitter setpoint can generate edge-surface temperature differences exceeding 5 K between clear and grey PVB. The practical response is to verify edge-to-centre temperature uniformity with contact thermocouples or thermal imaging and to reduce infrared power or line speed if the edge seal forms before complete air evacuation. Premature edge sealing traps air and produces elongated edge bubbles that are difficult to correct in the autoclave.
Autoclave parameters for Trosifol Greys follow the standard PVB thermal-pressure regime. Commercial cycles generally operate at 1.2 MPa to 1.4 MPa with a glass surface temperature of 130 °C to 140 °C; soak time is commonly 60 min to 120 min and is adjusted according to glass thickness, interlayer pack thickness, and the rate at which the centre of the laminate reaches full temperature. Thicker packs above 1.52 mm may require incremental soak-time extensions because the tinted interlayer absorbs heat near the surface while the thermal conductivity of glass is comparatively low. Temperature verification with embedded thermocouples is preferable to time-based cycle control alone. Post-autoclave cooling should be controlled; rapid forced-air cooling of high-absorption grey laminates can induce temporary edge tensile stresses. Laminated sheets should be placed on level racks until the glass surface temperature falls below 40 °C.
Post-laminate quality control includes optical distortion, bubble count, adhesion level, and edge seal. The adhesion level of PVB to glass is often assessed by a pummel test in which the laminate is broken and the exposed glass is compared against a graded scale. For Trosifol Greys, the tint does not change the pummel adhesion test method, but it may make visual rating of the exposed glass more difficult because the residual PVB is grey. The specification should therefore call for an adhesion target matching the safety and impact requirements, typically a controlled mid-range pummel value rather than maximum adhesion. Excessively high adhesion reduces impact energy absorption; excessively low adhesion increases delamination risk.
Because Trosifol Greys absorbs a higher fraction of incident solar radiation than clear PVB, the glass plies adjacent to the interlayer experience elevated thermal gradients. The highest stress usually occurs at the edge, at shadow boundaries cast by mullions or building projections, and at heat sinks such as bolts, point-fixing hardware, or internal shading devices. A grey-tinted interlayer therefore cannot be specified as a drop-in optical change without a thermal stress calculation. ASTM E2431 provides a method for determining the probability of breakage in annealed architectural glass under thermal loads; DIN 18008 provides a corresponding design pathway in German practice. If the calculated thermal stress exceeds the allowable design stress for annealed glass, the outer lite should be heat-strengthened or fully tempered before lamination. Tempering also changes the optical and mechanical background, so the interlayer processing schedule must be confirmed against the use of heat-treated glass; warpage and roller wave in heat-treated glass can alter interlayer contact during the de-airing step.
Low-emissivity coating position is part of the same thermal analysis. If a high-performance low-e coating is placed on the indoor-facing surface of the outer glass lite, the amount of absorbed energy retained within the laminate can increase, shifting the maximum temperature deeper into the glass. This interacts with the grey PVB absorption. The thermal boundary condition is not symmetrical, and the calculation should use the exact coating stack, glass thickness, tint transmittance, and edge shading pattern. In curtain-wall applications, cold-bridge effects at the frame can generate local temperature differences exceeding 20 K even when the global solar load is moderate. Under these conditions, the edge seal and moisture uptake are not the only risks; the glass itself may fail before the interlayer reaches its mechanical limit. A project-specific thermal stress analysis is therefore an operational boundary for specifying Trosifol Greys in spandrel or vision glazing with non-uniform shading.
The impact performance of a laminated glass panel containing Trosifol Greys is determined by the complete assembly: glass thickness, glass type, interlayer thickness, support conditions, and the applicable test standard. The interlayer alone does not confer a specific EN 12600 classification. Laminated glass with standard PVB interlayers can typically meet safety-glazing classifications when the glass fabricator follows an established build-up, but the classification must be confirmed by test or by an approved calculation path in the target market. Under ANSI Z97.1 and CPSC 16 CFR 1201, the product can be used in designs qualified as safety glazing, subject to the usual control of glass ply thickness and interlayer thickness. No claim of classification should be transferred from one glass make-up to another without verification.
Acoustic damping is not a primary specification basis for standard grey PVB. While all PVB interlayers exhibit some viscous energy dissipation, the acoustic performance of a Trosifol Greys build-up differs from a designated acoustic PVB interlayer. If the requirement is expressed as a weighted sound reduction index or as detailed frequency-band transmission loss data, an acoustic interlayer should be evaluated in the finite glass assembly under ISO 10140-2 or the relevant regional standard. Published data for the acoustic behaviour of grey-tinted standard PVB in finite structural bays is limited outside the supplier technical datasheet and the glazing fabricator’s tested assemblies.
Chemically, Trosifol Greys has the same sensitivity as other plasticized PVB interlayers. Edge contact with solvent-based cleaning agents, amines, strong alkalis, alcohol-based glass cleaners, and uncured acetic acid-cure silicone sealants should be avoided because long-term migration can produce edge delamination or haze. If the laminate is to be glazed into a structural silicone or insulating glass unit sealant system, compatibility testing of the edge sealant and PVB should be performed before specification, and the sealant manufacturer’s declared compatibility data should be reviewed. Service temperature is an additional boundary: PVB-based interlayers become stiffer at low temperatures and soften at elevated temperatures; applications requiring extended service below −10 °C or above 50 °C should be validated for post-breakage behaviour and interlayer adhesion under the expected thermal cycle. The grey tint itself does not establish a new low-temperature limit; it is the base PVB plasticizer system that controls the viscoelastic response.
