| HS Code | 750637 |
| Product Name | Saflex Evoca XIR.SR |
| Interlayer Type | Multilayer PVB interlayer with acoustic and XIR infrared-reflective properties |
| Color | Clear / neutral |
As an accredited Saflex Evoca XIR.SR factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Saflex Evoca XIR.SR interlayer film is supplied in moisture-proof packaging, with quantities per pallet available on request. |
| Container Loading (20′ FCL) | Saflex Evoca XIR.SR loaded in 20' FCL, palletized and securely packed to ensure safe, stable transport. |
| Shipping | Saflex Evoca XIR.SR is supplied as interlayer rolls on moisture-protected pallets. Keep packaging intact, store flat, dry, and away from direct sunlight or heat. Handle carefully to prevent edge or surface damage. Standard transport applies; not classified as dangerous goods under typical shipping regulations. |
| Storage | Store Saflex Evoca XIR.SR in its original, sealed packaging in a cool, dry, well-ventilated area. Protect from direct sunlight, UV exposure, heat sources, and moisture. Maintain recommended storage temperature, keeping rolls upright and away from solvents. Handle with clean gloves to avoid contamination, and use within stated shelf life. |
| Shelf Life | Shelf life is typically 12 months from manufacturing date, provided stored in original sealed packaging, at controlled temperature and humidity. |
Saflex Evoca XIR.SR is specified as a plasticized polyvinyl butyral interlayer with solar-control and sound-damping functionality in unitized and stick curtain wall assemblies where the glazing must reduce solar load without increasing the number of metal-coated glass surfaces. The lamination stack is typically configured as 6 mm heat-strengthened low-iron outer glass / 1.52 mm Saflex Evoca XIR.SR / 6 mm heat-strengthened inner glass. Glass surfaces are washed with deionized water at conductivity below 10 µS/cm and dried to below 0.1% residual surface moisture before layup. The interlayer is conditioned for 24 h at 18–20°C and 20–35% relative humidity. Lamination proceeds with nip-roller deairing at 0.3–0.6 m/min, while the glass pack is heated to 60–70°C. Autoclave conditions for this stack are 135–140°C and 12–14 bar for 90–120 min. Visible light transmittance and solar factor are calculated with EN 410:2011 using spectral data for the interlayer and glass substrates. Mechanical resistance is evaluated by ASTM E1300-23 or EN 16612:2019 using the effective thickness method. The edge trim after autoclave is held at 2–5 mm. Compliance documentation includes EN ISO 12543-2:2021 and EN 14449:2005 or national transpositions. Production records from flat-bed lamination lines show that edge voids can form if the preheating tunnel air temperature exceeds 75°C before nip-roller entry; the roll gap is therefore maintained at 0.3–0.5 mm below the measured glass stack thickness.
In overhead glazing installed above occupied spaces, the retained interlayer must maintain fragment adhesion after outer-lite fracture. The typical layup for a sloped facade or skylight is 8 mm heat-strengthened top glass / 1.52 mm Saflex Evoca XIR.SR / 8 mm heat-strengthened bottom glass, with the top lite carrying dead load and snow load. The interlayer is placed on the lower surface of the top lite before the bottom lite is aligned. Deairing uses a vacuum-bag or nip-roller system with minimum vacuum of 0.7 bar relative pressure for 30–45 min. The autoclave cycle is extended to 120 min at 135°C and 12–14 bar when the glass thickness exceeds 8 mm. Post-breakage retention is assessed according to EN 12600:2002 Class 1B1 or ANSI Z97.1-2015. Edge displacement of the interlayer after lamination is controlled within ±3 mm. Solar loads across sloped units are evaluated with EN 410:2011 combined with building energy simulation. On skylight production runs, the most frequent defect is a central bubble caused by insufficient vacuum dwell when the bag channel seals the perimeter; transfer to autoclave is permitted only after vacuum decay remains below 0.1 bar/min. The final product is a heat-strengthened laminated safety glass with a smooth planar surface and no exposed interlayer edges after structural silicone glazing.
| Parameter | Curtain wall | Overhead | Rail vehicle |
|---|---|---|---|
| Interlayer thickness | 1.52 mm | 1.52 mm | 0.76 mm or 1.52 mm |
| Glass configuration | 6 mm HS / 6 mm HS | 8 mm HS / 8 mm HS | 5 mm tempered / 5 mm tempered |
| Autoclave temperature | 135–140°C | 135°C | 132–135°C |
| Autoclave pressure | 12–14 bar | 12–14 bar | 12 bar |
| Hold time | 90–120 min | 120 min | 60 min |
| Deairing method | Nip roller, 0.3–0.6 m/min | Vacuum bag, 0.7 bar relative | Infrared preheat plus nip roller |
Rail vehicle glazing combines fire-safety requirements with acoustic damping and solar control. The laminate stack is often 5 mm thermally toughened soda-lime glass / 0.76 mm Saflex Evoca XIR.SR / 5 mm thermally toughened glass, or a double-interlayer build for floor-level panels. The acoustic loss factor of the laminated assembly is measured with ISO 16940:2008 using a beam specimen at 20°C and 50% relative humidity. Sound reduction of the complete glazing is measured by ISO 10140-2:2021 or ASTM E90-23. Fire performance for rail interiors is evaluated under EN 45545-2:2020 with heat release and smoke density limits applicable to the designated fire area. Lamination lines for rail use infrared preheating at 60–70°C followed by nip-roller deairing. The autoclave cycle is 132–135°C at 12 bar for 60 min. Moisture content of the interlayer before lamination must be below 0.50%; higher moisture causes edge bubbles at panel corners. The interlayer is stored in sealed bags at 18–20°C and conditioned at 20–25°C for 24 h prior to layup. Batch-to-batch variation in plasticizer content can shift the measured loss factor by several hundredths; incoming sheets are therefore marked with moisture content and thickness deviation before release to production. End products are vision panels in high-speed trains, metro cars, and tram cabs. Published data for this specific configuration is limited; project-specific acoustic and fire testing is required because the final glass build and framing system affect measured insertion loss.
In thin-film photovoltaic module fabrication, Saflex Evoca XIR.SR functions as a front-side interlayer and edge seal element in glass-glass modules. The layup from light-facing side to rear is 3.2 mm tempered low-iron float glass / 0.76 mm Saflex Evoca XIR.SR / solar cell matrix / 0.76 mm PVB encapsulant / 3.2 mm tempered float glass. Lamination is performed in a membrane vacuum press or autoclave with a temperature ramp of 3–5°C/min to 135–140°C, a vacuum hold at 100 kPa absolute for 8–10 min, and a pressure ramp to 12–14 bar for 30–45 min. The cell surface temperature must not exceed 145°C for more than 20 min for amorphous silicon or heterojunction cell structures. Electrical isolation and wet leakage current are tested according to IEC 61730-2:2016. The finished module is subjected to IEC 61215-2:2021 damp heat, thermal cycling, and humidity freeze testing. The interlayer provides a continuous encapsulating film without reactive crosslinking agents; no additional catalyst or initiator is added by the module fabricator. A recurring failure mode on BIPV lines is delamination at the busbar intersection when the cell step exceeds 0.4 mm and the interlayer cannot fill the step during pressure ramp; this is mitigated by increasing hold time to 45 min or using a thicker front-side interlayer. Thickness ratio is fixed by cell spacing and busbar height, typically 0.76 mm over a 0.2–0.4 mm cell step. Published data for this specific configuration is limited; module-level adhesion and wet-leakage performance must be confirmed with the selected cell type and backsheet stack.
If an automotive program requires Saflex Evoca XIR.SR for a windshield or roof module, the interlayer must be processed inside the same lamination line used for conventional PVB grades. Automotive glazing compliance is governed by ECE R43 Rev.4 and FMVSS 205. The glass bending process heats soda-lime float glass to 620–640°C before gravity sag bending. The windshield layup is 2.1 mm outer glass / 0.76 mm Saflex Evoca XIR.SR / 1.6–2.1 mm inner glass. Deairing is carried out in a vacuum ring or vacuum bag at 20–25°C for 15–20 min. Autoclave conditions are 140°C and 12–14 bar for 45–60 min. The interlayer solar transmission is evaluated by ISO 13837:2021 or EN 410:2011; infrared reflectance is determined with a spectrophotometer following ISO 9050:2003. Head-up display wedge-angle requirements are resolved by selecting a wedge-shaped interlayer or by adjusting the PVB sheet thickness profile. Automotive lines report that sudden vacuum release after autoclave can cause edge distortion if the windshield is removed above 45°C; cooling is staged to 40°C before load removal. End products include laminated windscreens, panoramic roof panels, and side glazing with defined visible light transmission. Published data for this specific configuration is limited; the fabricator must validate HUD distortion, pummel adhesion, and solar load against the vehicle manufacturer's specification.
| Application | Primary standard | Test property |
|---|---|---|
| Curtain wall | EN 14449:2005, EN 16612:2019 | Mechanical resistance |
| Overhead | EN 12600:2002, ANSI Z97.1-2015 | Post-breakage retention |
| Rail | ISO 16940:2008, EN 45545-2:2020 | Loss factor, fire reaction |
| BIPV | IEC 61730-2:2016, IEC 61215-2:2021 | Electrical insulation, durability |
| Automotive | ECE R43 Rev.4, ISO 13837:2021 | Optical and safety performance |
| Security | EN 356:1999, ASTM F1233:2021 | Forced entry |
For forced-entry and blast-resistant glazing, the laminate stack is designed around mechanical retention rather than solar performance. A typical build is 3 mm chemically toughened glass / 1.52 mm Saflex Evoca XIR.SR / 3 mm chemically toughened glass, with optional polycarbonate backing. The interlayer is laminated at 135°C and 12–14 bar for 180 min for thick multi-layer stacks. Manual attack resistance is tested according to EN 356:1999 P-class procedures, while forced-entry resistance is tested under ASTM F1233:2021. Bullet resistance is outside the single-interlayer scope and requires a separate polycarbonate or glass-clad polycarbonate configuration tested to EN 1063:2000. Edge sealing with polysulfide or silicone prevents moisture intrusion and interlayer edge recession. Security fabricators report that multi-layer stacks above 12 mm total thickness require a slower temperature soak to avoid differential stress in the core glass. The final product is used in bank counters, secure building facades, and detention glazing where solar control and sound damping are secondary. Published data for this specific configuration is limited; project-specific test reports must be generated for each build. Avoid amine-based primers in edge sealants because they can cause premature surface haze on PVB.
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Saflex Evoca XIR.SR is a multilayer polyvinyl butyral-based interlayer manufactured by Eastman Chemical Company for laminated safety glass. The product is constructed as a selective infrared-reflecting core embedded between PVB plies, rather than as a monolithic PVB sheet. The XIR.SR designation identifies the selective-core configuration within the Evoca platform. The interlayer is intended for automotive and architectural glazing applications in which solar-infrared reduction, visible light transmission, and laminated-glass safety retention are specified together.
The material is supplied in moisture-barrier-sealed roll form. Nominal PVB ply conventions are 0.38 mm and 0.76 mm; total interlayer thicknesses commonly follow 0.76 mm, 1.14 mm, and 1.52 mm build-ups, depending on the selective core and the required mechanical thickness. These are industry PVB conventions, not an exhaustive product availability list for XIR.SR. The density of plasticized PVB is approximately 1.07 g/cm³; a 0.76 mm interlayer therefore contributes approximately 0.81 kg/m² to the laminate mass. Exact product gauge, roll width, and selective-core construction must be confirmed against the current Saflex technical data sheet because published independent data for this specific configuration is limited.
For any laminated glazing, the interlayer cannot be specified independently of the glass configuration. Optical and solar performance are measured on the complete laminate using ISO 9050, EN 410, or ISO 13837. The key metrics include visible transmittance, visible reflectance, total solar direct transmittance, and UV transmittance. In automotive applications, ISO 13837 is used for transmittance and reflectance of glazing materials; in architectural applications, EN 410 or ISO 9050 provides the equivalent basis. U-factor and solar heat gain coefficient are not measured on the interlayer alone; they are calculated through NFRC 100, NFRC 200, ISO 10292, or EN 673 for the full glazing stack. For automotive safety glazing, ECE R43 or local equivalents govern installation eligibility; optical and mechanical requirements are assessed on the complete laminate.
| Qualification parameter | Standard or test method | Reported quantity | XIR.SR-specific note |
|---|---|---|---|
| Laminated glass impact resistance | EN 12600, ANSI Z97.1, ECE R43 | Breakage class | Full laminate build required |
| Optical transmittance and reflectance | ISO 9050, EN 410, ISO 13837 | Visible and solar transmittance | Measure on production glass, not the interlayer alone |
| Haze | ISO 14782, ASTM D1003 | Percent haze | Edge effects from the selective core should be excluded unless specified |
| Moisture content of PVB interlayer | ISO 15512 | wt% | Verify after conditioning and before layup |
| Sound transmission loss | ISO 10140-2, ASTM E90 | Rw or STL | Configuration-dependent; acoustic targets require supplier data |
| U-factor and SHGC | NFRC 100, NFRC 200, ISO 10292, EN 673 | W/m²K and SHGC | Use full glazing simulation |
Lamination yield is governed first by moisture. Polyvinyl butyral is hygroscopic; a roll removed from cold storage must be allowed to reach room temperature before opening to prevent condensation. The layup room is normally maintained at 15–25 °C and 20–40 % RH. Interlayer moisture content above 0.40 wt% increases the probability of steam or gas formation at the glass–interlayer interface during autoclave heating. Direct measurement of moisture content by Karl Fischer titration according to ISO 15512 is preferred over room humidity logs because film-core laminates can show a moisture gradient. The selective layer in XIR.SR can behave as a vapor barrier relative to the surrounding PVB, so moisture absorbed by the PVB plies may be slow to desorb. Standard PVB can often be conditioned in a few hours; an XIR.SR roll may require a longer stabilization window after a humidity excursion. If a roll has been exposed to ambient air above 60 % RH, pre-conditioning at 18–20 °C and 20–30 % RH until core moisture falls below 0.35 wt% is recommended before layup.
During washing, glass surface contamination must be controlled. Final rinse water conductivity on the production line should remain below 20 µS/cm; oil and tin-side residues must be removed. In high-humidity plants, condensation on the glass is prevented by maintaining glass surface temperature at least 3 °C above the calculated dew point. After layup, the stack is de-aired by nip rollers or vacuum bag. Nip-roll lamination lines for PVB operate with roll surface temperatures commonly in the range of 100–160 °C at the nip, followed by infrared heating. Vacuum-bag systems pull an initial cold vacuum below 50 mbar to remove bulk air before heating. If the selective core increases bending stiffness, edge gaps or residual air pockets at the cut edge may be more visible after autoclave when the de-airing step is insufficient. Autoclave conditions for PVB are generally 12–14 bar and 130–140 °C, with a hold time of 30–60 min at temperature. The selected ramp rate, pressure onset, and cooling profile must be validated for the selective-layer stack because thermal expansion mismatch between the polymer and the selective film can produce wrinkle defects if pressure is applied too late or too early.
Adhesion of the laminate is the primary safety variable. PVB adhesion to glass is controlled by glass surface chemistry, interlayer moisture, and the additive package. In laminated glass production, adhesion is often measured by the pummel test or compressive shear strength. A target pummel range of 3 to 7 is common for automotive and architectural safety glazing, but the XIR.SR selective core introduces an additional failure interface; the relevant pummel result is still measured on the full laminate, not on the interlayer alone. Compressive shear strength values for PVB-to-glass laminates are test-speed dependent and cannot be transferred from standard PVB to XIR.SR without product-specific validation.
Edge durability is a separate issue. At the cut edge, the selective film can act as a wick for cleaning fluids or sealant plasticizers if the laminated glass edge is exposed in the installation. Edge sealants are tested for compatibility by methods such as EN 1279-6 or ASTM C1260. Amine-catalyzed silicones or polysulfides are generally avoided with PVB because amines can disrupt interfacial adhesion and accelerate local plasticizer migration. High-pH cleaners and alcohol-based edge wipes are also avoided unless the supplier has qualified the specific chemistry.
Clear PVB, bulk solar-absorbing PVB, dedicated acoustic PVB, and XIR.SR differ in how they allocate mass, visible transmittance, and near-infrared performance. Clear PVB maintains high visible clarity but contributes little solar control. Bulk solar PVB uses near-infrared absorption; its absorbed energy is converted to heat inside the laminate. XIR.SR uses selective reflection in addition to absorption, so a portion of the near-infrared load is redirected outward, which can keep interior glass surface temperatures lower at the same visible transmittance. Dedicated acoustic PVB uses a viscoelastic core for higher damping but may not provide equivalent solar selectivity. Structural PVB or ionoplast interlayers offer higher stiffness and shear transfer for structural or security glazing but are outside the XIR.SR solar-control class.
Safety and acoustic behavior are not automatically improved by the solar-selective core. Laminated safety glass containing a PVB interlayer is evaluated by EN 12600 or ANSI Z97.1; the XIR.SR material participates in fragment retention as part of the laminate. The acoustic loss factor of a laminate around the coincidence frequency depends strongly on interlayer damping and glass thickness. A selective-core interlayer may exhibit lower damping than a dedicated acoustic PVB of equivalent total thickness because the stiff selective film can constrain shear deformation. If simultaneous sound reduction and solar control are specified, the manufacturer’s sound transmission loss data should be used. For blast or impact-resistant laminates, the effective shear modulus must be used in finite-element calculations. The use of XIR.SR in a hurricane-impact or blast-resistant laminate must therefore be supported by full-scale test data, not derived from clear PVB.
In lightweight automotive glazing, the selective-core interlayer may be combined with 0.7 mm to 1.1 mm chemically strengthened aluminosilicate or soda-lime glass. This configuration reduces total mass but changes the thermal stress field in the laminate. The outer glass and interlayer have differing coefficients of thermal expansion; the selective film adds another layer with different expansion behavior. During autoclave heating, the composite stack bends. If the cooling rate is set for thick clear PVB, the higher modulus selective film can generate residual stresses at the glass interface. These stresses may not be visible as delamination but can reduce spontaneous breakage resistance after installation. A slower autoclave cooling segment and a lower final top temperature may be required. The exact profile is determined by laminate thickness and glass type.
For architectural durability, laminated glass requirements are typically defined in ISO 12543 or customer-specific tests. For thin-glass automotive builds, thermal cycling from -40 °C to +85 °C is often used to expose edge defects. The sharp radius of thin-glass laminates during handling can also peel the selective layer at the edge; cut edges should be inspected under low-angle light before autoclave.
Storage, slitting, and handling differ from standard monolithic PVB. Because the selective core is less tolerant of creasing, rolls should be moved with mechanical lifting rather than manual dragging. Slitting knives must be kept sharp and free of adhesive residue; a dull blade can delaminate the film edge and create a visible white line after lamination. In-process humidity must be documented, not estimated. A dew-point sensor at the layup station and a Karl Fischer moisture analyzer for interlayer samples are appropriate for production-scale quality control. The XIR.SR designation should appear on batch control records and final product documentation. For glass fabricators producing both clear PVB and XIR.SR laminates, dedicated run rules prevent cross-contamination with silicone- or mineral oil-based cutting lubricants. Partially used rolls are returned to sealed packaging with a desiccant cartridge, and the next run proceeds only after interlayer moisture verification.
