| HS Code | 367646 |
| Product Name | Trosifol Spallshield CPET |
| Product Type | High-performance copolyester interlayer film |
| Material | Copolyester (CPET) resin |
| Appearance | Clear, colorless, transparent film |
| Nominal Thickness | 0.38 mm (other thicknesses available on request) |
| Density | 1.34 g/cm³ |
| Tensile Strength | ≥ 100 MPa |
| Tensile Modulus | ≈ 2.0 GPa |
| Elongation At Break | ≥ 80% |
| Tear Resistance | High tear-propagation resistance |
| Light Transmittance | ≥ 88% in the visible range |
| Haze | ≤ 1% |
| Glass Transition Temperature | ≈ 78°C |
| Melting Point | ≈ 250°C |
| Water Absorption | ≤ 0.3% |
As an accredited Trosifol Spallshield CPET factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Trosifol Spallshield CPET comes in sealed, moisture-proof foil-wrapped rolls packed in cartons, each containing 100 square meters. |
| Container Loading (20′ FCL) | Trosifol Spallshield CPET loaded into 20'FCL on wooden pallets, secured with straps and protective packaging to prevent damage. |
| Shipping | Trosifol Spallshield CPET is a transparent protective film/interlayer, shipped as rolled sheets on pallets. It is non-hazardous, requiring dry, temperature-controlled conditions to prevent sticking or deformation. Handle with care to avoid scratches, sharp creases, or moisture exposure during transit and storage. |
| Storage | Store Trosifol Spallshield CPET in its original sealed packaging in a cool, dry, well-ventilated area, ideally at 5–25 °C with relative humidity below 60%. Protect from direct sunlight, UV, heat sources, and moisture. Keep flat to avoid deformation, handle carefully, and use first-in-first-out stock rotation. Avoid contamination and prolonged storage. |
| Shelf Life | Store unopened in original packaging under cool, dry conditions; shelf life is typically 12 months from date of manufacture. |
Laminated glazing subjected to air-blast loading transitions from flexural response to membrane-dominated stress only if the interlayer stack retains fractured glass fragments after the front float plies fail. Trosifol Spallshield CPET is integrated as a PET-based composite ply with a PVB bonding interface, positioned adjacent to the rear-most glass ply or between two PVB plies so that the high-tensile PET core resists through-thickness tear during positive-phase deflection. Compliance is defined by ISO 16933:2007 and EN 13541:2012 for explosion-resistant security glazing, while shock-tube and dynamic overpressure qualification is governed by GSA TS01-2003 and ASTM F1642/F1642M-17. The CPET ply is commonly selected at 150–250 µm, corresponding to 6–10% of the interlayer stack thickness; in a representative stack of 6 mm glass / 1.52 mm PVB / 0.175 mm CPET / 1.52 mm PVB / 6 mm glass, the CPET layer represents approximately 5.5% of the interlayer stack. Downstream processing requires an ISO 7 cleanroom lay-up at 18–20°C and 25–35% relative humidity, followed by nip-roller or vacuum-bag de-airing and autoclave bonding at 130–140°C and 11–14 bar with a plateau of 90–180 min. The resulting laminates are cut, edge-sealed, and installed as blast-resistant curtain wall units, safe-room glazing, control room vision panels, and exterior door lites. Neutral-cure silicone edge sealant is specified because plasticizer migration from the PVB bonding phase can cause edge de-bonding with acidic or solvent-heavy sealants, particularly in blast scenarios where frame anchorage is simultaneously loaded.
| Application boundary | Governing standard | CPET caliper range | CPET stack contribution | Downstream process | Terminal product types |
|---|---|---|---|---|---|
| Blast-resistant façade retention | ISO 16933:2007, EN 13541:2012, GSA TS01-2003, ASTM F1642/F1642M-17 | 150–250 µm | 6–10% of interlayer stack | Nip-roller de-airing; autoclave 130–140°C | Curtain wall, safe-room glazing, door lites |
| Forced-entry / burglary resistance | EN 356:2000, UL 972, ASTM F1233-19 | 100–200 µm | 5–10% of interlayer stack | Conditioned lay-up; vacuum-bag de-airing; autoclave 130–140°C | Bank screens, transaction windows, storefront panels |
| Ballistic spall-layer control | EN 1063:2000, UL 752, NIJ 0108.01, STANAG 4569 | 175–250 µm | 8–15% of interlayer stack | Multi-ply glass/PVB/CPET/polycarbonate lay-up; controlled cool-down autoclave | Armored glazing, guard booth windows, high-security enclosures |
| Hurricane-impact fenestration | ASTM E1996/E1996M, ASTM E1886/E1886M, TAS 201, TAS 203 | 100–175 µm | 4–8% of interlayer stack | Large-format laminating line; nip de-airing; autoclave 60–120 min | Impact-rated windows, doors, curtain wall |
| Overhead / balustrade retention | EN 12600:2002, ANSI Z97.1, CPSC 16 CFR 1201 | 50–150 µm | 3–6% of interlayer stack | Standard safety-glass autoclave; edge trim ≥5 mm; neutral-cure sealing | Atria, canopies, skylights, balustrade panels |
| Rail vehicle spall protection | EN 15152:2019, UIC 651 | 100–200 µm | 4–8% of interlayer stack | Automated interlayer stretching; vacuum-bag de-airing; autoclave 130–140°C | Train side windows, metro cab partitions, tram windscreens |
Under EN 356:2000 forced-entry classification, P6B through P8B assemblies are evaluated with repeated drop-body impacts and axe strikes, and the rear-face spall layer becomes the decisive variable for maintaining the opening at the end of the required impact sequence. Trosifol Spallshield CPET is laminated as an internal PET-based composite ply between two PVB plies or directly behind the inner glass ply; the CPET caliper is typically 100–200 µm, corresponding to 5–10% of the interlayer stack thickness. UL 972 and ASTM F1233-19 provide the North American burglary-resistance counterparts. Downstream processing starts with float-glass cut-to-size operations, followed by interlayer lay-up at controlled humidity, vacuum-bag or nip-roller de-airing, and autoclave bonding at 130–140°C and 11–14 bar. Frame edge engagement is maintained at not less than 15–20 mm because security glazing failure at the bite is observed before center-pane penetration when the interlayer edge is insufficiently supported. Terminal products include bank counter screens, pharmacy transaction windows, detention glazing, display cases, and storefront anti-intrusion panels.
Ballistic attack produces a fragment cone behind the strike face, and the rear-most interlayer plies govern the residual fragment velocity and the extent of spall ejection. Trosifol Spallshield CPET is used in the interlayer stack between glass and polycarbonate or between PVB and the final glass ply because the PET core resists through-thickness perforation more effectively than PVB alone after the projectile has disrupted the front plies. Classification standards are EN 1063:2000, UL 752, NIJ 0108.01, and STANAG 4569. The CPET caliper is commonly 175–250 µm, representing 8–15% of the interlayer stack thickness; when the rear ply is polycarbonate, the CPET layer is generally placed immediately before the polycarbonate sheet to reduce rear-face spall velocity. Downstream processing requires alkali-free float glass and polycarbonate to be pre-conditioned and dried; polycarbonate with excess moisture absorption is dried at 110–120°C before lamination because batch-to-batch moisture variation above threshold causes haze and de-lamination. Autoclave temperature and pressure must be adjusted when polycarbonate is present because thermal expansion mismatch with glass induces bow and residual stress; published data for specific CPET/polycarbonate stack configurations is limited, and qualification trials are required for each build. Terminal products include armored glass for guard booths, embassy windows, cash-in-transit vehicle glazing, police vehicle side laminates, and high-security enclosures.
High-velocity hurricane zone glazing is governed by ASTM E1996/E1996M and ASTM E1886/E1886M missile-impact-and-cyclic-pressure protocols, along with Miami-Dade TAS 201 and TAS 203 product certification. In this application, Trosifol Spallshield CPET is inserted into the glass/PVB stack to improve post-impact integrity after the large-missile timber strike; the CPET ply is typically specified at 100–175 µm and accounts for 4–8% of the interlayer stack thickness. Downstream lay-up follows standard PVB lamination: cut-to-size glass, interlayer conditioning at 18–20°C and 25–35% relative humidity, nip-roller de-airing at 0.3–0.5 MPa, and autoclave curing at 130–140°C with 11–14 bar for 60–120 min. Frame attachment is critical because blow-in and blow-out cyclic pressures expose edge seals to repeated flexure; solvent-free polyurethane or neutral silicone secondary seals are specified to prevent moisture ingress at the laminate edge. Terminal products include impact-rated windows, doors, curtain walls, and skylights in coastal building envelopes.
Overhead glazing and glass balustrades are evaluated under EN 12600:2002, ANSI Z97.1, and CPSC 16 CFR 1201, where the acceptance criterion is not resistance to penetration but retention of broken fragments within the opening after steel-ball impact. Trosifol Spallshield CPET is introduced as a thin PET-based composite ply at 50–150 µm, occupying 3–6% of the interlayer stack thickness; this places the high-tensile PET core across the crack plane without adding the full mass of a thick PVB interlayer. Lamination follows standard safety-glass autoclave processing at 130–140°C and 11–14 bar. On production lines, the main failure mode for overhead configurations is edge de-lamination from moisture ingress; therefore the interlayer is trimmed no less than 5 mm from the glass edge and sealed with neutral-cure silicone. Terminal products include atria, canopies, skylights, glass floors, and structurally adhered balustrade panels; for glass floors, published data for this specific CPET configuration is limited and project-specific testing is required.
Mass-transit side glazing is commonly specified to EN 15152:2019 for railway vehicle windows, with additional spall requirements under UIC 651 or national metro standards. CPET-containing laminated glass is produced as an anti-spall interlayer stack between two float-glass plies, with the CPET caliper generally 100–200 µm and the CPET stack contribution at 4–8% of the interlayer thickness. Placement directly behind the inner glass ply improves rear-face fragment retention during stone-throw and vandal impact. Production involves large-format laminating lines with automated interlayer stretching to reduce optical distortion, followed by vacuum-bag de-airing and autoclave bonding at 130–140°C; optical and mechanical acceptance are defined by the vehicle glazing specification. Terminal products include heavy-rail side windows, metro cab partitions, and tram windscreens.
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Trosifol Spallshield CPET is a transparent composite interlayer for laminated safety and security glazing. The product combines a biaxially oriented polyethylene terephthalate (PET) core with polyvinyl butyral (PVB) bonding layers on both faces. The CPET designation identifies the PET-containing composite and distinguishes the material from monolithic PVB interlayers and ionoplast sheets. The PET core raises the in-plane stiffness and tear resistance of the interlayer after glass fracture, while the PVB skins provide glass adhesion and shear transfer across the laminate. This configuration is specified where post-breakage retention, reduced spall release, and controlled deflection are required under blast, ballistic, or forced-entry loading.
Supply formats include roll stock and slit sheets. Project-specific thicknesses are assembled from PVB skin thicknesses and PET core thickness, typically with PVB skins of 0.38 mm each. The total interlayer thickness is therefore not a simple multiple of 0.38 mm; it is determined by the selected PET core and the required PVB cover. Before lamination, roll direction, edge squareness, and visual quality are checked against the applicable portions of ISO 12543-2:2021. Published data for this specific configuration is limited in open literature; supplier technical data and third-party test reports should be used for project qualification.
Monolithic PVB interlayers are viscoelastic and exhibit high elongation under long-duration load. When the glass plies fracture, the PVB membrane carries the broken fragments and transfers the blast or impact load to the frame. Lower tensile stiffness permits large lateral deflection, and edge pull-out can occur before the membrane reaches its tensile failure strain. The observed failure mode is often sheet tear at the edge or debonding from the glass, releasing glass fragments. CPET modifies this response by introducing a PET core with higher tensile modulus and lower elongation than PVB. The composite interlayer retains the adhesion and processing characteristics of PVB but adds a load-bearing core that resists tear propagation from nicks or edge damage. Qualification for this behavior is normally performed through impact and blast test methods rather than material-level tensile tests alone.
Ballistic and forced-entry configurations typically place CPET on the protected side of a laminated glass make-up. The glass plies adjacent to the threat fracture and absorb energy, while the interlayer core and PVB skins retain fragments and reduce free-floating particles. Forced-entry resistance is assessed by EN 356 and EN 1063, with the class determined by the number of impacts or shots and the specified tool or ammunition. In United States projects, windborne debris and blast qualification often follow ASTM E1996 and ASTM F1642. These tests evaluate the entire fenestration system, including frame, glazing bead, and edge engagement. A CPET interlayer alone does not confer a particular EN or ASTM rating; the glass make-up, glass type, frame, and bite must be designed as a system.
| Function | Standard designation | Application context |
|---|---|---|
| Mechanical impact and fragmentation | EN 12600 | Drop-ball impact for safety glazing |
| Manual attack resistance | EN 356 | Forced-entry and vandal-resistant glazing |
| Bullet resistance | EN 1063 | Ballistic attack classes |
| Blast resistance | ISO 16933 | Explosive blast and fragment retention |
| Windborne debris impact | ASTM E1996 | Hurricane and impact-rated fenestration |
| Interlayer adhesion | ISO 12543-3 | PVB adhesion after lamination |
| Durability and weathering | ISO 12543-4 | High-humidity and temperature exposure |
CPET-containing laminates are processed on conventional PVB laminating lines. The lay-up sequence uses the CPET composite as a single interlayer sheet between glass plies. Vacuum de-airing and autoclave cycles must be adjusted because the PET core has lower gas permeability than PVB, which can slow residual air removal if edge channels are not maintained. On a flat-glass laminating line, the de-airing method may be a vacuum bag or multiple nip rollers; the lower gas permeability of PET means the first nip pass must not seal the cut edges before the central air is extracted. Typical PVB autoclave cycles operate at 130–140 °C and 1.0–1.4 MPa for 30–60 min at hold. The PET core remains dimensionally stable under these conditions, but the PVB skins require controlled moisture content for reproducible adhesion.
Moisture content in PVB is typically kept between 0.35% and 0.45% before lamination. Lay-up rooms above 60% relative humidity may require pre-drying of PVB and CPET rolls at 18–25 °C and 20–30% relative humidity until the target moisture content is reached. The processing window is narrow: deviations of ±0.05% from the target moisture range can alter adhesion levels and edge quality. Excess moisture can cause edge clouding, lower adhesion, or bubble formation; over-dried PVB can reduce adhesion and increase pummel values beyond the specified range. Production-scale experience indicates that edge squeeze-out can be lower than with thick PVB because the PET core does not flow. If the PVB skin is too moist, frosted edge bands may appear after autoclaving; if too dry, the laminate may exhibit low pummel adhesion and release glass flakes after glass breakage.
Compared with monolithic PVB, the PET core shifts the stress–strain behavior of the interlayer toward higher stiffness and lower elongation. Monolithic PVB acts as a damping and adhesion membrane; it cannot provide the in-plane tensile restraint that a biaxially oriented PET core offers. Compared with ionoplast interlayers, CPET uses a PET film as the stiffening element, whereas ionoplast derives stiffness from the polymer matrix itself. This difference matters in edge engagement design: ionoplast has high adhesion and stiffness across all directions, while CPET properties are dominated by the oriented PET film and therefore depend on roll direction and laminate orientation. The biaxially oriented PET film is normally balanced, but machine-direction and transverse-direction tensile properties should be confirmed by ASTM D882 or ISO 527-3. In biaxially oriented PET film, tensile modulus may lie between 2.0 GPa and 2.8 GPa at 23 °C, with elongation at break below 150% depending on grade. These values are for the PET film component; the composite interlayer response is thickness-dependent and should be derived from laminate testing. Because the PET core does not flow under autoclave conditions, stress relaxation and edge thinning observed in PVB interlayers are reduced. However, the PVB skins still flow and form the edge envelope, so cut-edge sealing and cleanliness remain critical.
Standard PVB interlayer thicknesses are 0.38 mm, 0.76 mm, 1.14 mm, and 1.52 mm, with multiples. CPET changes this comparison by introducing a non-flowing PET core; therefore, the effective total interlayer thickness cannot be compared directly with PVB thickness for stiffness. Designers should not assume that a 0.76 mm CPET replaces a 0.76 mm PVB interlayer in identical framing. Replacement is validated by testing according to the relevant impact or blast standard. Compared with polycarbonate interlayer materials, CPET is processed at lower autoclave temperatures and does not require the same elevated platen pressing or specialized interlayer edge trimming. However, CPET is not a substitute for bullet-resistant glass make-ups that rely on thicker polymer sheets or multiple glass/polymer combinations; it is a spall-mitigation interlayer selected within a complete security glazing stack.
Blast-rated fenestration design places high demand on edge engagement. The interlayer must transfer loads into the frame without tearing at the glass edge. Edge bite, structural silicone, and glazing beads are dimensioned according to the test standard and not by interlayer thickness alone. For CPET laminates, the edge should be checked for moisture ingress, because exposed PVB skins are hygroscopic. Exposed edges in humid environments may absorb moisture over time, and a protective edge seal is generally required when the service relative humidity exceeds 60%. Storage of unmounted sheets before lamination has similar boundaries: temperatures above 35 °C or direct sunlight can block the PVB surface and alter tack. Rolls should be stored horizontally with the core supported and should be brought to lay-up room temperature for 24–48 h before unwinding to avoid condensation. Shelf life is typically 12 months from shipment when stored in original packaging under controlled conditions.
Clear CPET constructions are typically designed to meet optical transmission requirements of ISO 9050 when combined with clear glass. The PET core may reduce visible transmittance by a small amount compared with a monolithic PVB interlayer of equivalent total thickness. Haze and clarity are measured by ASTM D1003. Ultraviolet-absorbing PVB skins can reduce UV exposure of the PET core because PET undergoes photolytic chain scission under prolonged direct UV. In laminated glazing, the outer glass and PVB layers provide UV screening; measured UV transmittance in the 300–380 nm range may be below 1% depending on the PVB grade. The PET core should be protected from prolonged ultraviolet exposure during storage because PVB skin edge discoloration can occur before lamination.
Material compliance assessments for CPET include composition checks under REACH regulation 1907/2006 and RoHS Directive 2011/65/EU. The PET and PVB components are not classified as hazardous in the supplied form; glass laminators should verify regional requirements for volatile organic emissions and recycling. For optical quality, the composite is inspected in transmission against ISO 12543-2, and laminated optical properties are measured by EN 410 or ISO 9050. Durability after lamination is assessed by ISO 12543-4, which includes high-humidity and elevated-temperature exposure. Each security glazing configuration should be validated with the specific glass type, interlayer orientation, edge seal, and framing bite intended for production.
